Multiple Choice
The factor(s) that determine the duration of a twitch in various types of fibers is the speed of the
A) removal of Ca²⁺ ions from the sarcoplasm only.
B) hydrolysis of ATP only.
C) movement of Na⁺ across their membranes only.
D) removal of Ca²⁺ ions from the sarcoplasm and hydrolysis of ATP.
E) removal of Ca²⁺ ions from the sarcoplasm and hydrolysis of ATP and movement of Na⁺ across their membranes.
Correct Answer:
Verified
Correct Answer:
Verified
Q12: The action potential traveling along the t-tubule
Q13: _ and _ are striated muscles.Why are
Q14: The I band contains<br>A) thick filaments only.<br>B)
Q15: Before the entire muscle can change length,
Q16: The interaction between Ca²⁺ and calmodulin in
Q18: The contraction cycle is triggered by the
Q19: Which fibers fatigue sooner?<br>A) fast-twitch fibers<br>B) slow-twitch
Q20: Match the structures with the accurate description.<br>-a
Q21: The H zone contains<br>A) thick filaments.<br>B) thin
Q22: _ is the backup energy molecule that