Question

84. Under normal conditions, any uld not reabsorbed by the venus end of the capillaries A) remains in the extracellular spaces. B) is absorbed by the surrounding cells. C) passes into lymphatic capillaries. D) is excreted in perspiration. E) diffuses to other capillary beds. 85. The pH of the extracellular fluid of a healthy person is A) acidic. B) slightly acidic C) neutral. D) slightly basic E) basic. 86. The acid-base balance depends on the concentration of A) calcium ions. B) hydrogen ions. C) potassium ions. D) sodium ions. E) magnesium ions. 87. A substance that dissociates into hydroxyl ions is a[n) A) buffer. B) acid. C) base. D) salt. E) ion. 88. Which of the following buffer systems help regulate the pH in red blood cells? A) carbonic acid buffer system B) phosphate buffer system c) hemoglobin buffer system D) protein buffer system E) bicarbonate buffer system 89. The most abundant buffer system in body cells and plasma is the A) carbonic acid buffer system. B) bicarbonate buffer system. C) phosphate buffer system. D) hemoglobin buffer system. E) protein buffer system. 90. The chemoreceptors in the medulla oblongata are stimulated by A) a decrease in the hydrogen ions of the blood. B) an increase in the hydrogen ions of the blood. C) decreased carbon dioxide concentration in the blood. D) decreased oxygen concentrations in the blood. E) an increase in the pH of blood.

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Answer 1

84. (C) pares into lymphatic capillaries 85- (0 slightly basic 86• (8) Hy drogen ione 87- (C) Base 88. (0) Hemoglobin buffer system 89.(47) carbonic acid buffer system