True or false: The "power stroke" described during the cross-bridge formation refers to the myosin head pivoting when it combines with actin shortening the sarcomere.判断题

A

True

B

False

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Question at position 1 Use the following steps for muscle contraction and relaxation and put them in order starting with the beginning of the contraction and ending with the relaxation of the muscle. Prompt 11Answer for prompt 1 1[input]Prompt 22Answer for prompt 2 2[input]Prompt 33Answer for prompt 3 3[input]Prompt 44Answer for prompt 4 4[input]Prompt 55Answer for prompt 5 5[input]Prompt 66Answer for prompt 6 6[input]Prompt 77Answer for prompt 7 7[input]Prompt 88Answer for prompt 8 8[input]Prompt 99Answer for prompt 9 9[input]Prompt 1010Answer for prompt 10 10[input]Prompt 1111Answer for prompt 11 11[input]Prompt 1212Answer for prompt 12 12[input]Possible answersThe sarcolemma changes polarity (charge) in response to the neurotransmitter.The nerve impulse from the brain to the muscle will cease.This repeated action causes the sarcomere to shrink and the muscle to contract.The free-floating calcium ions connect to troponin proteins causing them to change shape.The neurotransmitter Acetylcholine is released from the synaptic bulb onto the sarcolemma.Cross-bridges on myosin binds to the binding sites on actin.Motor Neuron sends signal to the muscle.Calcium ions are actively transported back into the sarcoplasmic reticulum and the linkage between actin and myosin filaments break.Tropomyosin also changes shape and moves out of the way of the binding sites on actin filaments. This initiates the contraction cycle.Do to the sarcolemma changing polarity, the T tubules change polarity and cause the sarcoplasmic reticulum to release calcium ions.Acetylcholine that stimulated the muscle fiber is rapidly decomposed by the enzyme acetylcholinesterase.Cross bridge pulls actin filament (power stroke).

Elbow Joint (EJ)   The lift phase of this exercise is __A to B     Elbow Joint (EJ) action:    A to B ___flexion __    and  B to A __ extension __   Agonists (active) EJ muscle group:   A to B__flexors __     B to A __ flexors __   Agonist EJ muscle group is:   A to B__ concentrically __   contracting B to A __ eccentrically __    

Question at position 24 In the sliding filament model of muscle contraction, the myofilaments slide over each other, resulting in the overlapping of actin and __________. myosin actin tropomyosin troponin

The muscles that are active (either concentrically or eccentrically contracting) to control a movement (up or down) are referred to as the __ [ Select ] neutralizers stabilizers agonists antagonists __. These muscles __ [ Select ] concentrically eccentrically isometrically __ contract as the weight is controlled in the downward phase of a movement.  

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