How is muscle contraction stopped? Which of the following is/are correct?   A) The brain stops sending the nerve impulse that commands the muscle to contract, interrupting communication at the neuromuscular junction B) Acetylcholineesterase (AChE) is released into the synaptic cleft to destroy any remaining Acetylcholine C) No mechanism is necessary. When the antagonist begins to contract, it forces relaxation and stretch of the agonist muscle. D) Relaxation occurs as the myosin heads are "snapped" off of the thick filaments. This interrupts the crossbridge and allows for muscles to stretch  E) Relaxation only occurs if the brain sends a "stop" signal to the muscle

Q: What prevents cross-bridges from attaching to sites on the thinfilaments in a resting skeletal…

A: Muscles are the tissues able to contract in response to stimuli.

Q: How does the activity of tropomyosin and troponin in muscle contraction compare with the activity of…

A: Troponin is a globular protein. Tropomyosin is a protein associated with myosin. Troponin and…

Q: What is isovolumetric contraction?

A: IT IS THE CONTRACTION IN WHICH THE VENTRICLES CONTRACT AND THE VOLUME OF THE VENTRICLE REMAINS…

Q: How and why does an ATP solution makes the muscle fiber contract and makes it length shorter? How…

A: Few important points to be kept in mind: Actin filament is made up of G-actins and it is act as…

Q: During evolution, skeletal muscle became adapted to functional de-mands ranging from sudden,…

A: The skeletal muscles of vertebrates are composed of different types of fibers. This includes slow…

Q: Even though calcium is removed from troponin and tropomyosin, please describe in detail what else…

A: The events that result in the contraction of human muscle fiber starts with the signal by a…

Q: Which of the following factors can contribute to a contracted muscle returning to its resting…

A: Step 1 Muscles show three unique properties- contractibility, excitability, and conductivity. Muscle…

Q: What are the steps and ions involved in muscle contractions ?

A: Muscle contraction can be defined as the activation of tension generated sites within muscle fibers.…

Q: List the Functions of ATP in Skeletal Muscle Contraction?

A: Muscle is a bundle of fibrous tissue, which is present in many higher animal bodies. There are three…

Q: How is smooth muscle contraction similar to skeletal musclecontraction?

A: Smooth muscle fibers are generally found in the walls of various visceral organs except the heart,…

Q: Which of the following are aspects of the structure of skeletal muscle? Select all that apply.…

A: MUSCULAR TISSUE:- This tissue is different from the rest of the tissue as this tissue can contract…

Q: Motor neurons release what type of neurotransmitter onto the motor end plate of skeletal muscles?…

A: Motor neurons of the spinal rope are essential for the central nervous system (CNS) and interface…

Q: The single-fiber twitch experiments shown here were generated by stimulating the muscle cell…

A: When a muscle is triggered by a single vibration, an action potential is generated that causes the…

Q: Summation in a single muscle fibre means that Select one: a. the fibre increases the frequency of…

A: Introduction Muscle contraction:- It is the activation of tension-generating sites within muscle…

Q: What is the function of myosin light-chain kinase in smooth muscle?

A: The muscular framework is an organ framework comprising of skeletal, smooth and heart muscles. It…

Q: Explain Molecular Mechanisms of Skeletal Muscle Contraction?

A: The soft tissue-like structure found in the majority of the animals including human beings is known…

Q: What cellular changes could cause the skeletal muscle to become rigid?

A: Skeletal muscle cells do not relax or remain in a rigid state due to lack of ATP and so muscle…

Q: Which type of contraction develops more muscle tension: isotonic or isometric?

A: Muscles are the tissues that can change their length and cause movement of the body parts.

Q: Identify three processes in a muscle twitch that require ATP?

A: When one muscle fiber contracts in response to a command (stimulus) from the nervous system, it is…

Q: What are the muscle-spindle stretch receptors?

A: The musculoskeletal system of a body allows the locomotion of different parts of the body. The…

Q: What are the two neurotransmitters involved in excitation and inhibitation of muscles?

A: A neurotransmitter is a chemical signal that transports, amplifies, and balances signals between…

Q: What effect does increasing the frequency of action potentials in askeletal muscle fiber have upon…

A: With alternative arrangements of light and dark band, skeletal muscles are striated muscles. They…

Q: What evidence supports a sliding filament-cross-bridge mechanism of contraction in smooth muscle?,…

A: The evidance for sliding filament cross bridge mechanism  is inferential  and derived from…

Q: List the four primary signal transduction pathways in skeletal muscle.

A: Signal transduction is defined as the ability of a cell to change behaviour in response to a…

Q: •What is the role of tropomyosin in muscle contraction?

A: Tropomyosin prevent myosin from continuing to slide up the actin filament.

Q: Diagram the arrangement of thick and thin filaments in a striated-muscle sarcomere, and label the…

A: While muscle contracts the I (isotropic) band  and H band shortens .Tge length of each sarcomere of…

Q: Why is the innervation of single-unit smooth muscle often restricted to only a few cells in the…

A: Smooth muscle (also known as visceral muscle because of where it is found) is one of the three major…

Q: How is smooth muscle contraction affected by the drugs called calcium channel blockers?

A: Calcium ions move in and out of the cell with the help of calcium channels that present in cardiac…

Q: when muscle fatigues, what does sarcomere look like?

A: A group of muscle fibers works together to produce a force. A muscle comprises muscle cell fibers…

Q: How are ion channels affected by receptors that stimulatesmooth muscle contractions? That inhibit…

A: Due to change in membrane potential muscle contraction occur.

Q: What is the process of an action potential in muscle tissue?

A: The question asks about the process involved in an action potential of muscle tissue.

Q: If individual muscle fibers always contract the entire way when stimulated, how are we able to…

A: A muscle fiber is a long cylindrical cell with multiple oval nuclei just beneath its sarcolemma or…

Q: How does the structure of the microfilaments allow for linear contraction of a whole muscle cells?

A: Microfilaments are little, string like protein fibres with a diameter of 3-6 nm. They are mostly…

Q: Why does Neostigmine cause an increase in the twitch tension when the nerve is stimulated and not…

A: Because neostigmine acts on nerve terminal increasing acetylcholine concentration by inhibiting…

Q: Why does repeated stimulation of the muscle (at maximum stimulus) before it has completely recovered…

A: Muscle contraction is the phenomenon of decreasing in size or shortening or compacting the muscle…

Q: If a muscle is contracted and shortening, what happens to the following: (a) width of the A band,…

A: A myofibril has light bands (A-bands or anisotropic bands) and dark bands (I-bands or isotropic…

Q: While the sarcoplasmic reticulum of muscle was first described by nineteenth-century microscopists,…

A: The structure of the sarcoplasmic reticulum is a little different from the normal endoplasmic…

Q: How is a muscle cell excited and why does it lead to a contraction in the muscle?

A: Excitation for Muscle Contraction:  ∙ Nerve impulse advances arrival of Neurotransmitter…

Q: Name the characteristics of muscles. Name the muscle functions. Name the types of muscles and…

A: As per our honor code we are authorized to answer only one question at a moment. In case you need…

Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.