Which of the following will cause local adjustments in an arteriole's radius and hence vessel diameter?
a. decreased O2
b. increased K+
c. increased O2
d. increased acid
e. all of these.
E
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Cells have a membrane potential, a slight excess of positive charges lined up along the inside of the membrane and a slight excess of negative charges on the outside
a. True b. False Indicate whether the statement is true or false
The major blood vessels that supply the skin lie between the dermis and the epidermis.
Answer the following statement true (T) or false (F)
Which of the following is true about nonspecific resistance and specific immunity?
A. Specific immunity requires a prior exposure to a pathogen so the system can recognize the pathogen B. Nonspecific defenses are widespread, meaning they work to fight many pathogens without prior exposure. C. Nonspecific defenses work to fend off any pathogen in the same way every time the pathogen comes along in the body. D. All of these statements are true.
The term "tonicity" refers to
A. the secretion of products outside of the cell through the plasma membrane. B. the effects of filtration on a cell. C. the effect of a solution on water movement into or out of cells. D. the separation of one cell into two daughter cells.