Which of the following is involved in the process of muscle relaxation
a. acetylcholinesterase destroys acetylcholine to allow the muscle membrane to return to resting potential.
b. Ca2+ is actively taken up by the lateral sacs of the sarcoplasmic reticulum when there is no longer a local action potential.
c. the cross bridges from the thick filaments bind to the thin filaments and bend in such a way as to return the filaments to their original resting position.
d. both (a) and (b) above.
e. all of these answers.
D
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Which of the following statements about movement via actin polymerization is true?
A) Movement can be generated using actin polymerization by itself (no motor proteins). B) Movement occurs only when motor proteins move across actin polymers. C) Actin polymerization prevents growth of filapodia. D) During cell movement there is always a net growth of actin polymer length.
Which of the following are considered to be bone-building cells?
a) fibroblasts b) osteoclasts c) osteocytes d) osteoblasts
According to the sliding filament model, in order for a sarcomere to contract:
a. bridges must form between the actin and myosin b. calcium must be released from the endoplasmic reticulum c. ATP must be broken down for energy d. all of the above
Antigens:
a. are produced by T lymphocytes b. are produced by B lymphocytes c. cause the formation of antibodies d. both B and C above