Histamine ____
a. causes blood vessels to contract
b. causes capillaries to lose their permeability
c. causes an outward flow of fluids from the capillaries
d. reduces tissue swelling
e. causes cells to release interferons
ANSWER: c
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The humoral immune response defends against ________.
A. bacteria B. viruses C. bacterial toxins D. All of the choices are correct.
Cells located in red bone marrow that give rise to platelets, red blood cells, and white blood cells are called ________ cells
Fill in the blank(s) with correct word
Which of the following is not one of the major transmembrane proteins in tight junctions?
a. Claudin b. JAM (junctional adhesion molecule) c. Occludin d. Thrombospondin
Why must all living cells carefully regulate the fluidity of their membranes?
A. to permit membrane lipids and proteins to diffuse from their site of synthesis to other regions of the cell B. to allow cells to function at a broad range of temperatures C. to ensure that membrane molecules are distributed evenly between daughter cells when a cell divides D. to allow membranes, under appropriate conditions, to fuse with one another and mix their molecules E. to constrain and confine the movement of proteins within the membrane bilayer