Multiple Choice
Which best describes a "myofibril"?
A) It is a single skeletal muscle cell.
B) It is a cylindrical cellular organelle composed of myofilaments.
C) It is a hollow membranous structure that stores calcium.
D) It is composed of a single type of protein and forms cross-bridges.
E) It is a fibrous junction between a muscle cell and a tendon.
Correct Answer:

Verified
Correct Answer:
Verified
Q37: Endurance exercise,such as long-distance swimming,causes a preferential
Q38: The site of Ca²⁺ storage in muscle
Q39: What would be the result if the
Q40: Type 2 muscle fibers typically have the
Q41: The decrease in mass and strength of
Q43: Why does breathing continue to be rapid
Q44: Which of the following properties of smooth
Q45: In the first few seconds of skeletal
Q46: A build-up of K⁺ in the T-tubules
Q47: Compared to type 1,both forms of type