Question 1
What are the contractile units within a myofibril called?
Question 2
What form of energy is utilized by myosin during muscle contraction?
Question 3
What blocks the myosin-binding sites on actin when a muscle is relaxed?
Question 4
Which process describes how actin and myosin filaments interact to shorten sarcomeres?
Question 5
Which structure serves as a site for calcium storage in muscle cells?
Question 6
In the power stroke, after myosin pulls actin filaments, what is released?
Question 7
During a muscle contraction, what role does calcium play?
Question 8
What event occurs at the neuromuscular junction?
Question 9
What happens immediately after ATP binds to the myosin head during the contraction cycle?
Question 10
What structural feature gives skeletal muscle its striated appearance?
Question 11
What causes the myosin heads to detach from the actin filaments after the power stroke?
Question 12
Which part of the sarcomere anchors the thick filaments?
Question 13
Which protein forms the thick filaments in a sarcomere?
Question 14
Which type of muscle is under involuntary control?
Question 15
What initiates the release of calcium ions from the sarcoplasmic reticulum?