43) Which of the following is characteristic of cardiac muscle? A) Cardiac muscl

Question

43) Which of the following is characteristic of cardiac muscle? A) Cardiac muscles are striated. B) Cardiac muscles achieve tetany with every contraction. C) Cardiac muscle fibers are multinucleated. D) Cardiac muscles are faster than skeletal muscles E) Neurons that innervate cardiac muscles are under voluntary control 44) Which of the following can be a stimulus for contraction in all three muscle tissue types? A) epinephrine B) thyroid hormone C) testosterone D) parathyroid hormone E) acetylcholine 45) The less-movable end of a skeletal muscle is the A) insertion. B) belly. C) origin. D) proximal end. E) distal end. Matching Questions 1) Match the muscle in the first column with its action in the second column. 1. rectus femorisA. dorsiflexion 2. adductor magnus B. extends leg 3. biceps femoris C. plantar flexion 4. gastrocnemius D. adducts thigh 5. tibialis anteriorE. flexes leg ESSAY QUESTION: In detail, explain the physiology of a muscle contraction from the nerve stimulus to the release of the contraction. Please make sure to list all the proteins involved, neurotransmitters and and ions involved in this contraction cycle (17 points)

Explanation / Answer

Q43) ANSWER:- a) Cardiac muscles are striated

Cardiac muscle is one of the three major types of muscle, the others muscles being skeletal and smooth muscle. It is an striated muscle that is found in the walls of the heart.

Q44. ANSWER) following can be a stimulus for contraction in all three muscle tissue types E) acetylcholine

acetylcholine molecules bind or ties to nicotinic ion-channel receptors on the muscle cell membrane, results in causing the ion channels to open. Similarly, calcium ions flow then into the muscle cell and hence, starting a sequence of steps that eventually produce muscle contraction.

Q45. ANSWER) The less-movable end of a skeletal muscle is the D) proximal end

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