A partial depolarization of a postsynaptic neuron or muscle cell in response to a neurotransmitter is a(n) _______ postsynaptic potential.
Fill in the blank(s) with the appropriate word(s).
excitatory
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Palytoxin is a very potent toxin from a particular seaweed in Hawaii that locks the carrier proteins of the ion pump system of the cell in an open position. What result would this have on cell function?
A) Sodium cannot enter the cells, and cell metabolism is damaged. B) The cells cannot utilize glucose. C) Phagocytosis is inhibited. D) Diffusion cannot occur. E) The cell cannot concentrate ions to achieve concentrations necessary for cell function.
Cardiac muscles are always dependent on aerobic metabolism?
a. true b. false
Which layer of the uterus serves as the site of implantation?
A) fundus B) cervix C) myometrium D) endometrium E) perimetrium
Vitamin A plays a critical role in night vision because:
A. it is required for the synthesis of the retinal portion of rhodopsin. B. it is transformed into the opsins found in cone cells. C. it acts a coenzyme in the reaction that degrades cGMP within rod cells. D. it catalyzes the mitotic generation of light-reflecting epithelial cells, which support widely dispersed rod receptors. E. it is a key intermediate in the signal transduction pathway within cone cells that is activated by light.