The hepatic portal vein is formed by the junction of:
a. the hepatic and splenic veins
b. the superior and inferior mesenteric veins
c. the gastric and intestinal veins
d. the splenic and superior mesenteric veins
Answer: d. the splenic and superior mesenteric veins
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Which of the following features of the stratum corneum is incorrect?
A) It is composed of differentiated epithelial cells. B) Its purpose is to reduce water loss. C) The tissue is dead and unresponsive to physical changes. D) It is heavily keratinized.
The upper chambers of the heart are _____ and _____.
A) atria; pump blood within the heart B) atria; pump blood out of the heart C) ventricles; pump blood within the heart D) venticles; pump blood out of the heart.
Which of the following types of drugs would inhibit spontaneous emptying of the bladder (incontinence)?
A. drugs that enhance the effects of parasympathetic neurons on the detrusor muscle B. drugs that block the effects of parasympathetic neurons on the detrusor muscle C. drugs that inhibit the effects of sympathetic neurons on the internal urethral sphincter D. drugs that inhibit the effects of somatic neurons on the bladder E. drugs that inhibit the action of sympathetic neurons on the external urethral sphincter
MgCl2 fully dissociates into Mg2+ and Cl- ions when mixed with water. Therefore, the bonds between Mg2+ and Cl- in MgCl2 can be described as
A. nonpolar covalent. B. ionic. C. hydrogen bonds. D. polar covalent.