Place the steps leading to muscle contraction in the correct order.Calcium allows myosin to bind to the actin.A message travels down the axon of a nerve.Myosin pulls on the actin causing the muscle to shorten.An electrical wave of the action potential travels across the muscle cell and deep into the interior of the cell.The end of the axon of the nerve releases the neurotransmitter, acetylcholine.The electrical charge causes calcium to be released into the cytoplasm of the muscle.The neurotransmitter, acetylcholine travels across the space between the axon ending and the muscle.The neurotransmitter, acetylcholine, binds to receptors on the muscle.

A nerve impulse travels to the neuromuscular junction on a muscle cell. The neuromuscular junction…

alcium allows myosin to bind to the actin. - message travels down the axon of a nerve. lyosin pulls on the actin causing the muscle to shorten. n electrical wave of the action potential travels across the muscle cell and deep into the interior of the cell. he end of the axon of the nerve releases the neurotransmitter, acetylcholine. he electrical charge causes calcium to be released into the cytoplasm of the muscle. - he neurotransmitter, acetylcholine travels across the space between the axon ending and the muscle. itter acotvlcholine binds to rocenters on the mucclo

alcium allows myosin to bind to the actin. - message travels down the axon of a nerve. lyosin pulls on the actin causing the muscle to shorten. n electrical wave of the action potential travels across the muscle cell and deep into the interior of the cell. he end of the axon of the nerve releases the neurotransmitter, acetylcholine. he electrical charge causes calcium to be released into the cytoplasm of the muscle. - he neurotransmitter, acetylcholine travels across the space between the axon ending and the muscle. itter acotvlcholine binds to rocenters on the mucclo

Lifetime Physical Fitness & Wellness

15th Edition

ISBN:9781337677509

Author:HOEGER

Publisher:HOEGER

Chapter8: Muscular Flexibility

Section: Chapter Questions

Problem 3AYK

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Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.
Skeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the above
The power stroke in muscle contraction is the: Group of answer choices product of force and velocity in muscle contraction transmission of the action potential down the neuron rotation of the myosin head after the cross bridge forms transmission of the action potential down the neuron
Which of the following is associated with smooth muscle contraction? Troponin as calcium-sensing protein. Contraction based on the sliding filaments theory. Calcium-induced calcium release mechanism. Electromechanical calcium release mechanism. Contraction requires myosin light-chain kinase activity
Which of the following happens within the sarcomere during muscle contraction? The myosin filaments "walk" along the actin filaments bidirectionally towards the Z lines. The myosin filaments shorten. The actin filaments shorten. The H bands and I bands both increase in width.
Order the events leading to muscle contraction. Ca ions bind to troponin myosin binds to actin Nerve cell releases acetylcholine at the neuromuscular junction troponin pulls tropomyosin, exposing the mysoin binding site ATP causing myosin to move (pull) actin toward the center of the cell the sarcolemma membrane depolarizes and triggers the sarcoplamic reticulum to release Ca ions
Which of the following correctly states the importance of an action potential to muscle contration? The SR will only release Ca2+ if it has been electrically stimulated. Sarcomeres require a negative electrical charge to start sliding. Actin and myosin must be electrically charged to create a cross-bridge. ATP cannot be split into ADP and Pi without an action potential.
Skeletal muscle will be released in its contracted (rigor) state when: Group of answer choices ATP is hydrolyzed into forming ADP and inorganic phosphate. ATP binds to the myosin head. ADP is dissociated from the myosin head. ATP binds to the actin G-molecule.
Put in order the steps of activation, excitation and contraction of skeletal muscle.
Which of the following alters the force of skeletal muscle contraction? the frequency of stimulation does NOT alter the force of skeletal muscle contraction alters the force of skeletal muscle contraction the size of the fibers being stimulated does NOT alter the force of skeletal muscle contraction alters the force of skeletal muscle contraction the number of muscle fibers stimulated does NOT alter the force of skeletal muscle contraction alters the force of skeletal muscle contraction the length- tension relationship of the muscle does NOT alter the force of skeletal muscle contraction alters the force of skeletal muscle contraction
The region of the muscle fiber involved in a neuromuscular junction is called the: Group of answer choices Voltage-gated ion channels Synaptic end bulb Synaptic cleft Motor end plate Synaptic vesicle
In the process of muscle contraction, which of the following steps requires hydrolysis of ATP to complete? movement of myosin head, pulling the thin filament binding of myosin head to active site on actin resetting of the myosin head back to its ready position letting go of myosin head from the active site on actin sliding of tropomyosin causing exposure of actin