Which of the following statements about excitation-contraction ...

[iveyjurea]

Which of the following statements about excitation-contraction coupling is incorrect?
 A) Calcium ions travel through the transverse tubule.
  B) Calcium ion is released from the sarcoplasmic reticulum.
  C) Tropomyosin moves to expose myosin binding sites on actin.
  D) Troponin binds calcium ion and signals tropomyosin to move.
  E) Relaxation requires uptake of calcium ion by the sarcoplasmic reticulum.

Question 2

At what point during excitation contraction coupling does exocytosis play a role?
 A) during calcium ion reuptake into the sarcoplasmic reticulum
  B) when sodium channels open up on the motor end plate
  C) during acetylcholine release from the synaptic terminal
  D) when the action potential surges through the T-tubules
  E) when ATP splits into ADP and P on the free myosin head

[jojobee318]

Answer to Question 1

A

Answer to Question 2

C

[iveyjurea]

Excellent

[JaynaD87]

Thanks for the timely response, appreciate it