Except for potassium ions, tubular secretion of most unwanted substances occurs in the ________.
A. collecting duct
B. proximal convoluted tubule
C. distal convoluted tubule
D. nephron loop
Ans: B. proximal convoluted tubule
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What results from the effect of aldosterone along the DCT, the collecting tubule, and the collecting duct?
increased conservation of sodium ions and water increased sodium ion and water excretion decreased sodium ion reabsorption in the DCT increased sodium ion excretion
The muscle tone of the ________ along the colon contracts it lengthwise, causing its walls to bulge and form pouches called ________.
A. taeniae coli; haustra B. internal sphincters; omental (epiploic) appendages C. haustra; taeniae coli D. circular folds; ceca E. internal sphincters; ceca
Which of the following is NOTÂ an intestinal enzyme?
A. Sucrase B. Pepsin C. Lactase D. Peptidase
Which of the following muscles functions to maintain an erect spinal column and head?
A) erector spinae B) biceps brachii C) triceps brachii D) rectus femoris E) biceps femoris