Quiz: Muscle Contraction

1. The binding sites for the cross-bridges are located on __________.
a. actin
b. myosin
c. troponin
2. When muscle contracts upon stimulation, calcium ions bind to __________, which exposes the binding sites for the myosin cross-bridges to attach to.
a. actin
b. myosin
c. troponin
3. When the cross-bridges bind to actin, they will pivot in such a manner to cause the actin filaments to slide. This pivoting action causes the actin filaments to slide __________.
a. farther apart
b. closer together
c. toward the Z lines
4. Calcium ions are released from the sarcoplasmic reticulum to initiate muscle contraction and are reabsorbed upon muscle relaxation. Which of the following occurs if calcium ions are not completely reabsorbed?
a. The next muscle contraction will be greater than the previous muscle contraction.
b. The next muscle contraction will be weaker than the previous muscle contraction.
c. There won't be a second muscle contraction until all the calcium ions are reabsorbed.
5. In order to make ATP (adenosine triphosphate) in muscles, creatine phosphate (CP) transfers __________ to adenosine diphosphate (ADP).
a. oxygen
b. phosphate
c. adenosine
6. ATP can be made in muscles from stored glucose. In muscles, glucose is stored in the form of __________.
a. energy
b. creatine
c. glycogen
7. Lactic acid, a byproduct of cellular respiration, is typically produced during __________ respiration.
a. anaerobic
b. aerobic
c. isometric
8. Which of the following is the correct sequence for the production of ATP for muscle contraction?
a. anaerobic respiration, CP, aerobic respiration
b. aerobic respiration, CP, anaerobic respiration
c. CP, anaerobic respiration, aerobic respiration
9. Calcium ions will cause the troponin/tropomyosin complex to move in such a manner as to expose the actin binding sites. The calcium ions are released from the __________.
a. sarcomere
b. sarcoplasmic reticulum
c. presynaptic vesicles of the axons
10. ATP is required for muscles to contract. Which of the following statements is FALSE?
a. ATP is used to get the cross-bridges to bind to actin.
b. ATP is used to get the cross-bridges to disconnect from actin.
c. ATP is used to get the troponin-tropomyosin complex to move in such a manner to expose the binding sites.
11. Lactic acid is NOT produced during which of the series of reactions?
a. glycolysis
b. aerobic respiration
c. anaerobic respiration
12. Which of the following sets of reactions produce the most ATP for muscle contraction?
a. glycolysis
b. aerobic respiration
c. anaerobic respiration
13. Which of the following cells converts lactic acid back to pyruvic acid so pyruvic acid can be involved in producing ATP?
a. liver
b. skin
c. spleen

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