Diffusion of a substance across the cell membrane is influenced by all of the following except
A) hydrolysis of ATP.
B) the presence of the membrane channels.
C) the charge of the substance.
D) concentration gradient.
E) lipid solubility.
Answer: A
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Persons with type AB blood are sometimes called universal donors.
Answer the following statement true (T) or false (F)
Angiotensin II causes a(n)
A. stimulation of the thirst center and increased release of ADH. B. stimulation of the thirst center and decreased release of ADH. C. inhibition of the thirst center and increased release of ADH. D. inhibition of the thirst center and decreased release of ADH.
Which condition is caused by the hypersecretion of cortisol?
A. Addison disease B. Goiter C. Cushing syndrome D. Acromegaly E. Graves disease
Erection of the penis occurs when
A. lymphatic fluid accumulates in the glans penis. B. penile erectile tissue becomes engorged with blood. C. the pubic bones move together. D. the bulbourethral muscles contract. E. smooth muscle contraction occurs in ductus deferens.