As the urethra passes through the pelvic floor, it is encircled by which urethral sphincter?
a) external
b) spongy
c) internal
d) membranous
a) external
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Hormones released into the interstitial fluid by the anterior pituitary enter the circulation easily because
A) they are brought through the choroid plexus by active transport. B) they pass easily through the infundibulum. C) a strong countercurrent mechanism maintains a concentration gradient that draws them in. D) the adjacent capillaries are fenestrated to permit passage of large molecules into the circulation. E) None of the answers are correct.
What structure marks the division between the left lobe and right lobe of the liver?
A) bare area B) round ligament C) falciform ligament D) broad ligament E) peritoneal ligament
Which of the following statements concerning the pancreas is true?
A. Most of the hormones produced by the pancreas flow into the pancreatic duct. B. Both glucagon and insulin are produced in the islets of Langerhans. C. The pancreas is located above the liver. D. The endocrine portion of the gland is called the zona reticularis. E. Alpha and beta cells are associated with the acini.
How is vital capacity calculated?
A. IC + FRC B. ERV + RV C. VC + RV D. TV + IRV