The fibers that carry the action potentials that cause skeletal muscle to contract are ________.
A. anulospiral endings
B. extrafusal fibers
C. alpha motor neurons
D. intrafusal fibers
E. gamma motor neurons
Answer: C
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Using Figure 22.3, match the following:
1) Produces enzymes that break down all categories of foodstuffs.
2) Increases surface area for absorption via villi and microvilli.
3) Bacteria process undigested chyme from the small intestine.
4) Only digestive structure with three muscle layers.
5) Receives blood via the hepatic portal system.
6) Contains the brush border enzymes that complete digestion of carbohydrates and proteins.
7) Main function is to filter and process the nutrient-rich blood delivered to it.
8) Produces intrinsic factor.
9) Produces a mucoid barrier.
Atherosclerosis is caused by plaque.
Answer the following statement true (T) or false (F)
The myocardial cells receive their blood supply from the coronary arteries that branch off from the aorta.
Answer the following statement true (T) or false (F)
Which of the following statements concerning the loop of Henle of juxtamedullary nephrons is correct?
a. the ascending limb of the loop of Henle is freely permeable to H2O and NaCl. b. the filtrate is isotonic as it enters the loop of Henle, hypertonic at the tip of the loop, and hypotonic as it leaves the loop of Henle. c. the descending limb of the loop of Henle actively transports NaCl out of the tubule into the interstitial fluid. d. all of these answers. e. none of these answers.