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Question 21 An andrenergic ligand bonds to Beta 2 receptors on smooth muscle of bronchioles. Through the...

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Medical Sciences

Question 21

An andrenergic ligand bonds to Beta 2 receptors on smooth muscleof bronchioles. Through the action of the intracellular secondmessenger cAMP protein kinase is activated which phosphorylates andinactivates MLCK. How does this impact bronchiole diameter?

P-MLCK can't phosphorylate myosin light chains in myosin heads,causing bronchodilation

P-MLCK will activate myosin heads to form crossbridges,resulting in bronchdilation

P-MLCK activates ATPase on myosin heads causingbronchoconstriction

Question 22

Which myofilament in smooth muscle makes up the Dark Bands inskeletal muscle?

Only actin

Myosin and overlapping actin

Only myosin

Question 23

About _________ percentage of energy (ATP) consumed by skeletalmuscle is used by myosin ATPase on myosin heads forcontraction.

30

50

99.9

70

Answer & Explanation Solved by verified expert
4.0 Ratings (699 Votes)
21 The smooth muscle contraction of the bronchial muscle wall leads to decrease in the bronchiole diameter and bronchoconstriction This process will take place when the myosin heads undergoPhosphorylation and cross bridging If myosin heads undergo phosphorylation cross bringing occur that leads to    See Answer
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