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Human Physiology: Nerve and Muscle Physiology

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Human Physiology: Nerve and Muscle Physiology

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Questions and Answers

What is the molecular mechanism responsible for muscle contraction?

Release of acetylcholine by exocytosis

Movement of calcium ions into the nerve terminal

Interference of troponin-I with myosin

Binding of troponin-C to actin (correct)

What initiates the attractive force between actin and myosin crossbridges during muscle contraction?

Release of acetylcholine by exocytosis

Movement of calcium ions into the nerve terminal (correct)

Binding of troponin-C to actin

Tilting of the myosin cross-bridges

What represents the relaxing proteins that inhibit interaction between actin and myosin?

Sodium ion

Acetylcholine

Tropomyosin (correct)

Troponin-C

What leads to muscle fatigue during prolonged and strong contraction?

Depletion of muscle glycogen (C) Signup and view all the answers

What is the main result of forceful muscular activity on a muscle?

Muscle hypertrophy (A) Signup and view all the answers

What is the function of the T-tubules in muscle physiology?

They help for rapid transmission of action potential (A) Signup and view all the answers

What covers the active sites on actin molecules in myofibrils during resting state?

Tropomyosin (B) Signup and view all the answers

What is the main composition of the sarcoplasmic reticulum in muscle physiology?

Longitudinal tubules and terminal cisterns (C) Signup and view all the answers

What is the function of the postsynaptic density in the nervous system?

Contain neurotransmitter receptors (B) Signup and view all the answers

What is the structure that is innervated by only one nerve ending in muscle physiology?

Each muscle fiber (C) Signup and view all the answers