Water channels in cells in the collecting duct are called __________.
Fill in the blank(s) with the appropriate word(s).
aquaporins
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The effects of a neurotransmitter on the postsynaptic membrane include which of the following?
A) The neurotransmitter floats around in the synaptic cleft. B) Upon stimulation, the membrane releases more neurotransmitter molecules. C) Excitatory or inhibitory responses. D) Neurotransmitter molecules are absorbed by the postsynaptic cell. E) None of the answers are correct.
Late in pregnancy, levels of estrogen and oxytocin rise
Indicate whether this statement is true or false.
Immunocompetence ________.
A) occurs in one specific organ of the adaptive immune system B) is the ability of individual cells to recognize a specific antigen by binding to it C) prevents intercellular communication so that only specific cell types respond to the invader D) requires exposure to an antigen
Diffusion results from
a. ATP-driven processes. b. use of ion gradients. c. inherent kinetic energy of matter. d. selective permeability. e. loss of positive charge.