The purpose of peristalsis is to:
break apart chunks of food and mix it in digestive juices.
propel food forward along the GI tract.
absorb food.
enable swallowing.
The Correct Answer is B
A. break apart chunks of food: This describes segmentation, which is a mixing movement rather than a forward-moving wave.
B. propel food forward: Peristalsis is a wave-like contraction of smooth muscle that pushes the "bolus" or "chyme" forward through the digestive system.
C. absorb food: Absorption is the chemical/physical transport of nutrients into the blood, not the movement of the food mass itself.
D. enable swallowing: Swallowing (deglutition) involves peristalsis in the esophagus, but the purpose of peristalsis as a whole is movement throughout the entire tract.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. sodium: While some sodium leaks in, the resting membrane is significantly less permeable to sodium than to potassium.
B. potassium: The resting neuronal membrane has "leaky" channels that are specifically permeable to K + , allowing it to diffuse out down its concentration gradient.
C. proteins: Intracellular proteins are large, negatively charged molecules that cannot cross the membrane.
D. phosphate: Like proteins, phosphate ions are trapped inside the cell and cannot diffuse across the resting membrane.
Correct Answer is A
Explanation
A. Vagus: While the Vagus nerve (CN X) has many sensory functions, it is primarily involved in visceral sensation and parasympathetic control, rather than proprioception (sense of body position) for skeletal muscles.
B. Hypoglossal: CN XII carries proprioceptive fibers from the tongue muscles.
C. Accessory: CN XI carries proprioceptive fibers from the sternocleidomastoid and trapezius muscles.
D. Abducens: CN VI (and other nerves moving the eye) carries proprioceptive feedback regarding the position of the eyeball.
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