NBDE part I question

[chasan2]

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Does anyone please tell me why the answer is 2 and not 3. I think it should be 3 b/c calcium binds to troponin first, and then tropomyson is removed to un-inhibit the actin from binding to myosin.

Which of the following best describes the primary role of Calcium in the activation of the cardiac muscle?
1. cause depolarization of muscle
2. couple myosin and actin to form actinomyosin (answer)
3. reduce inhibition of troponmyosin upon myofilament
4. activate myosin so that it can interact with actin.

🙂

 

[perennialdent]

Does anyone please tell me why the answer is 2 and not 3. I think it should be 3 b/c calcium binds to troponin first, and then tropomyson is removed to un-inhibit the actin from binding to myosin.

Which of the following best describes the primary role of Calcium in the activation of the cardiac muscle?
1. cause depolarization of muscle
2. couple myosin and actin to form actinomyosin (answer)
3. reduce inhibition of troponmyosin upon myofilament
4. activate myosin so that it can interact with actin.

🙂

thats cause it does not reduce but prevents inhibition and thus causing actin and myosin coupling....tats wat i think

 

[DR TOOTH]

Can anyone please explain the following processes- which part of kidney participates and what solutes/solvents are transported in each. Thanks

primary active transport
secondary active transport
facilitated diffusion
simple diffusion
solvent drag