Which of the following is correct? a. Calcium attaches to troponin b. Sodium att

Question

Which of the following is correct? a. Calcium attaches to troponin b. Sodium attaches to tropomyosin c. Manganese attaches to actin d. Potassium attaches to myosin Which of the following is correct? a. Tropomyosin moves troponin b. Troponin moves tropomyosin c. Actin moves troponin d. Troponin moves myosin What prevents continued stimulation of the neuromuscular junction? a. Troponin b. The axon terminal c. Acetylcholine d. Acetylcholinesterase Why is ATP required In muscular contraction? a. It causes muscle contraction by directly powering actin b. It causes contraction by directly powering myosin C. It detaches myosin heads from actin and cocks the myosin back d. It detaches troponin from actin and cocks troponin back Fred, the powerlifter, is just barely starting his world record breaking powerlift. As his huge muscles strain to lift the weights off the floor, and before the weights actually move, Fred finds himself in what? a. Isotonic contraction b. Concentric contraction c. Eccentric contraction d. Isometric contraction Sam wants to pick up his girlfriend's sofa. He finds that this requires something different than when he lifted his glass of OJ this morning during breakfast. What will he do? a. He will recruit more and larger motor units b. He will cause his muscle fiber twitch frequency to increase c. He will recruit larger cells d. All the above Betty, after falling down the stairs, finds that she has lost all muscle tone in her arms. The doctors tell her: a. Don't worry, muscular use should come back soon b. Don't worry, after 8 months of therapy you'll be good as gold c. We're sorry, you've had severe muscle damage and won't get better d. We're sorry, you've had severe nerve damage and won't get better

Explanation / Answer

14.Calcium attaches to troponin:- At high concentrations Ca2+ binding to troponin C.

15.Troponin moves tropomyosin:-Upon binding calcium,troponin moves tropomyosin away from the myosin-binding sites on actin, effectively unblocking it.

16.Acetylcholinesterase:- Acetylcholine opens ion channels, and sodium ions diffuse in to the muscle cell. Acetylcholine does not remain in the synaptic cleft forever, but rather an enzyme called acetylcholinesterase catalyzes the breakdown of acetylcholine in the synaptic cleft.

17.It detaches myosin heads from actin and cocks the myosin back:-ATP first binds to myosin, moving it to a high-energy state. ATP is hydrolyzed into ADP and inorganicphosphate by the enzyme ATPase.The energy released during ATP hydrolysis changes the angle of the myosin head into a cocked position, ready to bind to actin if the sites are available. Once the myosin forms a cross-bridge with actin the Pi disassociates and the myosin undergoes the power stroke.After the power strock, ADP is released, but the cross-bridge formed is still in place. ATP then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.ATP then attach to myosin which allows the cross-bridge cycle to start again.

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