The binding of a neurotransmitter to inhibitory synapses increases the permeability of the subsynaptic membrane to ____
a. sodium or chloride
b. potassium or calcium
c. potassium or chloride
d. potassium or sodium
e. calcium or chloride
c
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Which cells display CD4 proteins and interact with MHC Class II antigens?
a) Cytotoxic T cells b) Helper T Cells c) Memory T Cells d) MHC antigens e) B cells
The ability of a male to ejaculate is due to the action of ________.
A) parasympathetic nerves B) the dartos muscle C) luteinizing hormone D) the bulbospongiosus muscles
Which of the following is NOT true of diffusion in the human body?
A) Net movement of molecules occurs until the osmolarity is equal. B) Diffusion occurs faster at higher temperatures. C) Diffusion is rapid over short distances and slower over longer distances. D) Smaller molecules take longer to diffuse than larger ones.
Which of the following statements regarding NK cells is a false or incorrect statement?
A) NK cells are a type of neutrophil. B) NK cells are present in the blood, spleen, lymph nodes, and red bone marrow. C) NK cells attack cells that display abnormal MHC antigens. D) NK cells attack cancer cells and virus-infected body cells.