Microfilaments
A) are usually composed of myosin.
B) are hollow, filamentous structures.
C) anchor the cytoskeleton to integral proteins of the cell membrane.
D) interact with filaments composed of tubulin to produce muscle contractions.
E) are found in the cytoplasm radiating away from the centrosome.
C
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During the luteal phase of the ovarian cycle, LH levels remain elevated for ________, long enough to stimulate the formation of a functional corpus luteum.
A) 5 days B) 24 hours C) 7 days D) 2 days E) 6 hours
Compared to arteries, veins
A) are rounder in a sectional cut. B) have more smooth muscle in their tunica media. C) have a pleated endothelium. D) have thinner walls. E) hold their shape better when cut.
The __________ are the photoreceptors responsible for night vision.
Fill in the blank(s) with the appropriate word(s).
Cells of the ________ gather around the notochord and neural tube and produce the vertebra and rib at their associated level
A) myotome B) intermediate mesoderm C) dermatome D) sclerotome