The arrival of an action potential causes the release of ____ by the ____
a. calcium; myofibrils
b. calcium; sarcoplasmic reticulum
c. sodium; myofibrils
d. sodium; sarcoplasmic reticulum
e. actin; myosin heads
b
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The hydroxyapatite that makes up the bulk of the bony endoskeleton of vertebrates is found in:
A. osteocytes. B. the extracellular matrix of osteocytes. C. the collagen. D. osteoblasts.
A monogamous couple is researching birth control methods. They want children in the future, and the woman
currently has high blood pressure. Which birth control method would be best for them? What will be an ideal response?
A difference between a morula and a blastula is that the:
A) blastula has fewer cells than the morula. B) morula is a solid ball of tightly packed cells, whereas the blastula has a cavity in the center. C) morula is a well-developed embryo, and the blastula is an earlier stage of development. D) morula has a hollow center, but the blastula doesn't.
Protein phosphorylation is another way to alter the conformation of an enzyme and serves exclusively as a mechanism to increase enzyme activity.
a. true b. false