20. Food moves along the digestive tract as the result of contractions by _______. (A) cardiac muscle (B) smooth muscle (C) striated muscle (D) skeletal muscle

23. The motor (somatic nervous) system can alter the activities of its targets, the skeletal muscle fibers, because _______. (A) it is electrically coupled by gap junctions to the muscles (B) its signals bind to receptor proteins on the muscles (C) its signals reach the muscles via the blood (D) it is connected to the internal neural network of the muscles

20. Food moves along the digestive tract as the result of contractions by _______.
(A) cardiac muscle
(B) smooth muscle
(C) striated muscle
(D) skeletal muscle

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