lpg/Blackboard.uiwtx.edu/webapps/asse 113738 124198.1 QUESTION 1 2.00000 points

Question

lpg/Blackboard.uiwtx.edu/webapps/asse 113738 124198.1 QUESTION 1 2.00000 points Save Answer An action potential is initiated after acetylcholine binds to receptors at the neuromuscular junction causing Na* influx. This is transmitted down where it signals the sarcoplasmic reticulum to release Ca2+ and initiate contraction. a. z-line Troponin O c. T-tubules o, d, Myosin 2.00000 points Save Answer QUESTION 2 What is the direct role of Ca2+ in muscle contraction? a. Ca2+ binds to the myosin heads to facilitate myosin binding to actin thin filaments O b. Ca2+ binds to troponin to facilitate myosin binding to actin Ca2+ increases the membrane potential of myocytes d. Ca2+ binds to tropomyosin to facilitate myosin binding to actin Click Save and Submit to sqve and submit. Cick Save All Ansvers to save all answers

Explanation / Answer

Answer 1. Answer will be option b i. e. Troponin. It means an action potential is initiated after acetylcholine binds to receptor at the neuromuscular junction causing sodium ion influx. This is transmitted down Troponin where it signals sarcoplasmic reticulum to release calcium ion and initiate contraction.

Answer 2.Answer will be option b i. e. Calcium ion binds to Troponin to facilitate myosin binding to actin. The main role of calcium in muscle contraction is to bind Troponin and initiate contraction. Muscle contraction is sliding of actin over myosin. The main unit of muscle contraction is sarcomere, which is distance between two Z-line. Sarcomere is made of actin and myosin protein. In muscle contraction there is decrease in the length of sarcomere.

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