Final answer:
The muscle primarily responsible for a particular movement is known as the prime mover or agonist. The biceps brachii is an example of a prime mover in the action of lifting a cup, with the brachialis as a synergist.
Explanation:
A muscle whose contraction is chiefly responsible for producing a particular movement is called a prime mover or agonist. Skeletal muscle is a voluntary, striated muscle type that is attached to the bones of the skeleton and facilitates body movements. Muscle tissue is capable of contracting and generating tension in response to stimulation, and its action is achieved by the coordinated effort of several muscles. While the prime mover is the principal muscle causing a specific movement, others, called synergists, may assist in the motion. Additionally, a muscle that acts with the opposite effect of the prime mover is known as an antagonist, whereas a synergist that stabilizes the origin site is termed a fixator. To illustrate, when lifting a cup, the biceps brachii acts as the prime mover, while the brachialis acts as a synergist aiding in this movement.
Why does an action potential only move in one direction?
Action potentials move in one direction due to the refractory period, which inactivates sodium channels in the previous axon segment, preventing backward propagation. This ensures the signal moves from the cell body to the presynaptic terminal continuously. The all-or-nothing nature of action potentials also supports this unidirectional movement.
Action potentials only move in one direction—from the cell body to the presynaptic terminal—due to the refractory period, which prevents them from moving backward down the axon. This period occurs because after an action potential passes through a segment of the axon, the voltage-gated sodium channels in that segment become inactivated and cannot reopen immediately. As the action potential moves from one Node of Ranvier to the next, the downstream segments are depolarized while the upstream segments remain in a refractory state, ensuring that the action potential can only move forward toward axon segments with closed sodium channels ready for rising phase depolarization.This mechanism is supported by the all-or-nothing nature of action potentials, where each depolarization opens the next set of sodium channels, propagating the signal unidirectionally and with full strength down the axon.What is one biotic factor that affects the size of a population in an ecosystem? A) local geography B) number of predators present C) average yearly temperature D) average yearly precipitation
Treatment of irritable bowel syndrome usually includes making dietary changes and _____.
If respiratory compromise occurs what action should the nurse take
What types of cells do not undergo mitosis
Cells that do not undergo mitosis include mature differentiated cells like neurons and cardiac muscle cells, and reproductive cells or gametes that reproduce via meiosis.
Explanation:The type of cells that do not undergo mitosis include most mature differentiated cells such as neurons and cardiac muscle cells. These cells are considered to be in the permanent phase or G0 phase, where they are metabolically active but do not divide.
Also, cells that reproduce through a different process known as meiosis do not undergo mitosis. These cells include the reproductive cells or gametes (sperm and egg cells) in both animals and plants.
While most cells in the body do undergo mitosis for growth and repair, these specified cells do not.
In biology, not all cells undergo mitosis. Cells that do not undergo mitosis are called permanent or non-dividing cells. Examples of non-dividing cells include nerve cells, muscle cells, and red blood cells. These cells have specific functions and do not typically reproduce or divide.
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name three properties you could use to distinguish a proton from an electron?
Electrons are negatively charged particles while protons are positively charged particles. Electrons have very little mass while protons are massive particles.
The atom is composed of three fundamental particles which are;
ElectronsProtons NeutronsThe electrons are found in orbits. They all exist outside the nucleus. On the other hand, the protons are found inside the nucleus.
Electrons are very light particles. The electron has an infinitesimal mass while the proton is a massive particle. The proton is 1840 times heavier than the electron.
An electron has a negative charge. This can be easily seen when electrons are deflected in an electric field. Protons are positively charged and are deflected accordingly in an electric field.
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The branch of science that provides a counterexample to the notion that every event has a cause is known as _____. quantum physics quantum computing relativity theory chaos theory
Quantum physics is the branch of science that provides the counterexample to the notion that every event has a cause.
Further Explanation:
Quantum mechanics or physics refers to the wave mechanical model which includes the quantum field theory. It is known to be a fundamental theory found in physics that illustrates the nature at the tiniest scales of the energy levels of the subatomic as well as atomic particles. In quantum mechanics, it describes the wave function and energy level of the atom.
This results in what might appear to be certain strange conclusions related to the physical world. This branch works as an operating system. This facilitates efficient working of physical theories.These theories help in the smooth working of application software.
Application of quantum physics are:
To show the photoelectric effect. To reveal the structure of the atom. To study the covalent bonding and ionic bonding. To study quantum chemistry. Help in laser treatment.
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Quantum Physics
Keywords:
Quantum physics, mechanics, operating system, atomic particles, theories, energy, level, subatomic, branch, nature.
During a trip to Galapagos island which Observation led Charles Darwin to suspect that organisms change over time
Galapagos island is the land of unique species of animals and plants. It has 26 types of species of birds and different species of plants that can easily adapt to the environment.
Further Explanation:
The Galapagos Islands is a land of thirteen large islands (archipelago) and a close abouta hundred small islands. Galapagos word has taken from the oldest Spanish word that means tortoise. So that the meaning of word is island of the tortoises. It is a home for unique and different species for example; giant tortoises, sea lions, iguanas and sharks.
On this island, he has observed that there are various types of species of finches. The island has a total 26 types of bird species from which fourteen species are Darwin finches. Darwin observes that Darwin finches are the rapidly evolving vertebrate. The different types of species of finches varied from one land to another. This island also has a unique kind of fauna. They may have evolved from daisies.
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Answer Details:
Grade: High School
Subject: Biology
Chapter: Natural selection
Keywords:
Galapagos, island, archipelago, Spanish, tortoise, giant, iguanas, Darwin, finches, vertebrate, mosses, lichens, faunas, climate.
Bacterial growth refers to an increase in the numbers of cells in a bacterial culture. bacterial growth refers to an increase in the numbers of cells in a bacterial culture.
a. True
b. False
The health-care provider has suggested that the client use a particular vitamin in megadoses to help lower serum cholesterol. which vitamin is it
Which example of artificial selection is caused indirectly by human activity?
A.)choosing sheep that enable offspring to give a large amount of wool
B.)mating goats that produce more milk
C.)selective mating among ducks to produce larger eggs
D.)increased number of small crabs because fishing nets catch mostly large crabs
A bursting forth of blood from the stomach is known as
A bursting forth of blood from the stomach is commonly related to a severe peptic ulcer that has caused gastrointestinal bleeding, often leading to hematemesis, which is the vomiting of blood.
A bursting forth of blood from the stomach is often related to a condition known as a peptic ulcer. This ulcer is a sore in the lining of the stomach, which can sometimes become severe enough to expose blood vessels and lead to bleeding, also known as gastrointestinal bleeding. Factors contributing to ulcer formation include the destruction of the gastric epithelium, leading to acid reaching the stomach wall. Furthermore, ulcers can be formed due to a variety of other reasons such as Helicobacter pylori infection, chronic use of nonsteroidal anti-inflammatory drugs (NSAIDs), or stress.
Emesis, or vomiting, can occur as a body's response to this condition, expelling blood along with stomach contents. Alarmingly, a severe ulcer can expose the wall of stomach vessels causing bleeding that can pose a threat to one's health. This loss of blood can result in what is known as a hematemesis, which is vomiting of blood that may appear as bright red or have a coffee-ground appearance due to partial digestion by acidic digestive juices.
Acute symptoms leading to these severe complications can be a burning sensation or pain in the upper abdomen, often worsening at night and improving with eating, as well as gastroesophageal reflux disease (GERD) which involves heartburn.
The ability of your heart and lungs to work efficiently during physical activity is called
What does the plasma membrane of a phagocyte attach to on a microorganism? what does the plasma membrane of a phagocyte attach to on a microorganism? pseudopods glycoproteins lysosomes phagosomes?
The plasma membrane of a phagocyte attach to on a microorganism is called the glycoproteins. The glycoproteins’ functions are to identify, adhere to and communicate with the cell, among other functions. This only happens when these glycoproteins are already located in the cell membrane. Sugar molecules are attached to these glycoproteins which are actually proteins. Gathered into short chains which are called the oligosaccharides, these sugar molecules are all found in this area. The glycoproteins are used by the cells which are embedded in the plasma membrane to get the oligosaccharides on the outside of the cell. These glycoproteins normally are attached to the polypeptide side-chains.
Atom A has an atomic number of 19 and mass number of 40. Atom B has an atomic number of 20 and a mass number of 40. Which of these is an accurate statement?
A) Atom A has more protons than Atom B.
B) Atom A has one less proton and one more neutron than Atom B.
C) Atom A has an extra nucleon compared to Atom B.
D) Atom A has one more proton and one more electron than Atom B.
You're answer is B.
I know It's late.
Why are sponges considered the simplest animals?
Sponges are multicellular, heterotrophic, lack cell walls, and produce sperm cells, making them comparable to other creatures. They don't have genuine tissues and organs like other animals have.
What feature make sponges simplest animal?Because their bodies don't have organ systems or even tissues, sponges are regarded as one of the most basic organisms.
Instead, sponges are composed of a collection of cells that cooperate to help the sponge satisfy its daily needs.
Although sponges are formed of cells, those cells are not arranged into genuine tissues, making them exceedingly simple organisms. They are not segmented, have an asymmetrical body form, and are not symmetrical.
Sponge feeding is the sole feeding mechanism that separates them from other animals. Because they lack mouths, poriferans suck water through tiny holes in their external walls.
Therefore, sponges considered the simplest animals.
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Sponges are considered the simplest animals due to their basic cellular organization. They do not have true tissues, complex organs or a circulatory system, and rely on diffusion for gas, waste, and nutrient exchange. They represent an early stage of multicellular organisms.
Explanation:Sponges, belonging to the phylum Porifera, are considered the simplest animals due to their primitive cellular organization. Unlike other complex animals, they lack true tissues and organ systems. They represent an early stage of multicellularity and are thought to be similar to the potential ancestors of all animals: colonial, flagellated protists.
Sponges have a single or a few cell layers and they don't have a circulatory system. Instead, gases, nutrients, and wastes are exchanged by diffusion. A large central cavity, the spongocoel, is filled with water that enters from numerous pores in their body wall and flows out through a large opening called the osculum.
Despite their simple structure, sponges are highly successful organisms, having survived on Earth for over half a billion years. They depend on the intracellular digestive processes for their energy intake, a method that requires food particles to be smaller than individual cells. So, their nutrition is also based on a simple method compared to other organisms.
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True or false: the ability for an animal to use nitrogen in the air depends on the decomposition of animals by nitrogen fixing bacteria
Which of these is a compound?
Question options:
carbon
carbon dioxide
air
oxygen
Answer:
carbon dioxide
Which organism has a central ganglia in its head connected to a ladder-like arrangements of nerve fibers.
A. Spider
B. Seahorse
C. Frog
D. Flatworm
Viruses, bacteria, fungi, protozoa, and parasitic worms are known as __________.
A client rescued from a burning building has partial- and full-thickness burns over 40% of the body. which initial physiologic change will the nurse expect?
Explain why animal cells cannot capture energy from sunlight and use it to make food
Plants and other organisms convert sunlight, water, and carbon dioxide into food (sugar). Photosynthesis requires chlorophyll. Animal cells lack chlorophyll and cannot photosynthesis.
Why can't animal cells make their own food?The primary transformation of the light energy from the sun into the form of chemical energy that may be utilized by living things takes place in organelles called chloroplasts.
In contrast to plant cells, animal cells do not have chloroplasts, which are organelles that are able to harness natural energy sources such as solar radiation and convert simple chemicals into more complex ones. Chloroplasts have the ability to take in sunlight and make use of it, together with water and carbon dioxide gas, in the process of producing food.
Therefore, animal cells cannot synthesize food from sunlight due to lack of chloroplast.
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Why is the nucleus considered the command center of the cell?
The most common chronic diseases involve the heart and are called cardiovascular diseases. true or false
In which stage of the cell cycle are sister chromatids separated and pulled to the opposite poles of the cell?
What happens when two species occupy the exact same niche
A. One will cause a primary disturbance
B. They will both increase in population
C. They will help each other
D. Only one will survive
Answer: D. Only one will survive
Explanation:
An ecological niche can be define as the functional role an organism plays in an ecosystem so as to survive. Like, the mode of nutrition, type of habitat chosen for survival and season chosen for breeding are the examples of ecological niche.
If two species occupy the same ecological niche, the species which is more superior over the other will receive all the resources. The species which is inferior will decline and extinct according to the competitive exclusion principle. Hence, only one species will survive.
The process whereby molecules in vesicles are exported out of the cell is called
A) diffusion
B) endocytosis
C) exocytosis
D) osmosis
The correct answer is option c. Exocytosis.
The exocytosis is a process, by which the cells transport their secretions out of the cells in a membrane bound vesicle. The exocytosis generally transports the water-soluble molecules out of the cell. The products present in the membrane bound vesicle, which is transferred is released outside the body of the cells.
Answer:
The answer is C Exocytosis
Explanation:
In the hershey–chase experiment, dna was demonstrated to be the genetic material because the 32p label for dna localized to ________.
Why would the nurse ensure that a patient's condom catheter is not twisted?
Which of these beakers contains a solution? Explain the answer. In the beaker that has been determined to contain a solution, identify the solute and the solvent.
Answer:
Solution may be defined as the mixture of two or more different substances. The two main different components of the solution are the solute and solvent in the mixture.
Solute may be defined as the substance that dissolved in the solvent. So, the salt and oil is the solute as they are dissolved in the solution. Solvent may be defined as the substance in which the solute is dissolved. So, water is a solvent in which the oil and salt is dissolved to make a solution.