Practice%20Exam%204%20v2

Practice%20Exam%204%20v2 - BISC 220, Spring 2010, Exam 4 v2...

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Page 1 of 4 BISC 220, Spring 2010, Exam 4 v2 Albert Herrera 1. In the absence of both vasopressin and aldosterone, the greatest fraction of water filtered into kidney tubules is reabsorbed in the … a. loops of Henle. d. cortical (upper) collecting ducts. b. proximal tubules. e. medullary (lower) collecting ducts. c. distal tubules. 2. Which one of the following statements is false ? a. Cortical nephrons have short loops of Henle. b. ADH makes the collecting duct more permeable to water. c. Uric acid is the least soluble of the nitrogenous waste products. d. Humans secrete nitrogenous wastes primarily in the form of urea. e. Aldosterone is secreted in response to high levels of Na + in the blood. 3. What is the significance of the fact that the ascending limb of the loop of Henle is impermeable to water but actively transports Na + and Cl - ions out of the tubular fluid? a. These mechanisms create a hyperosmotic fluid within the distal convoluted tubule. b. These mechanisms cause the osmolarity of the tubular fluid to progressively increase as it ascends in the loop of Henle. c. These mechanisms make it possible for antidiuretic hormone to control the amount of water reabsorbed in the ascending limb of the loop of Henle. d. By extruding these ions but not letting water follow by osmosis, this helps create a high solute concentration in the interstitial fluid of the inner medulla. 4. For 4 of the 5 hormones in the following list, the primary target organ is another endocrine organ. For which one of these hormones is the primary target not an endocrine organ? a. FSH d. prolactin b. TSH e. growth hormone c. ACTH 5. Kallman’s syndrome is a disorder in which GnRH-releasing neurons do not migrate to the hypothalamus and develop normally. Which one of the following would not be expected in a patient with untreated Kallman’s syndrome? a. infertility d. rare and irregular ovulatory cycles in women b. low desire for sex e. feminization of male secondary sex characteristics c. high sperm counts in men 6. A 2-year-old girl is brought to a doctor because her mother is concerned that she is growing more slowly than normal. The pediatrician notes her apathetic appearance and the fact that her thyroid gland is greatly enlarged. He orders some blood tests. The results show that her plasma levels of thyroid hormone are low and plasma levels of thyroid stimulating hormone are high. Upon further examination, which of the following is the doctor likely to discover? a. The girl usually has a high body temperature and is chronically agitated and irritable.
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This note was uploaded on 02/28/2012 for the course BIO 220 taught by Professor Morre during the Spring '09 term at USC.

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Practice%20Exam%204%20v2 - BISC 220, Spring 2010, Exam 4 v2...

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