Place the following events of the muscle contraction in order:1.)Myosin Heads of the myosin cross bridges are released from the Actin Filaments. The Actin filaments move outward returning the H zone to its original length and the muscle relaxes2.)The cross bridges of the Myosin filaments bend inwardThe Actin filaments move inward 3.)The z-lines attached to the Actin filaments move inward narrowing the H-Zone. Muscle is contracted4.)An action potential is started when the neurotransmitter Acetocholine crosses the neuromuscular junction.Then, Myosin Heads of the cross bridges attach to the Actin filaments.

MUSCLE CONTRACTION

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Place the following events of the muscle contraction in order:1.)Myosin Heads of the myosin cross bridges are released from the Actin Filaments. The Actin filaments move outward returning the H zone to it’s original length and the muscle relaxes2.)The cross bridges of the Myosin filaments bend inwardThe Actin filaments move inward 3.)The z-lines attached to the Actin filaments move inward narrowing the H-Zone. Muscle is contracted4.)An action potential is started when the neurotransmitter Acetocholine crosses the neuromuscular junction.Then, Myosin Heads of the cross bridges attach to the Actin filaments.

A	1, 3, 4, 2
B	4, 2, 3, 1
C	3, 4, 2, 1
D	4, 3, 2, 1

Explanation:

Detailed explanation-1: -Depolarisation and calcium ion release. Actin and myosin cross-bridge formation. Sliding mechanism of actin and myosin filaments. Sarcomere shortening (muscle contraction)

Detailed explanation-2: -Action potential travels down motor neuron. Acetylcholine (ACH) released into sarcolemma. Action potential on sarcolemma. Sodium ions (Na+) rush into muscle cell. Calcium (Ca+) released from cisternae. Myosin heads attach to actin. Muscle contracts.

Detailed explanation-3: -discharge of motor neuron at myo-neural plate (endplate) release of the neurotransmitter acetylcholine at the endplate. binding of acetylcholine to its receptors. increased Na+ and K+ conductance in endplate membrane. generation of action potential at endplate. More items

Detailed explanation-4: -A nerve impulse travels to the neuromuscular junction on a. Ach is released from the axon to receptors located on the. The binding Ach causes depolarization of the sarcolemma by. Na+ ions diffuse into the muscle fiber and depolarization. More items

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MUSCLE PHYSIOLOGY

PHYSIOLOGY

MUSCLE CONTRACTION