Where does nutrient absorption primarily take place?
Mouth
Small intestine
Large intestine
Stomach
The Correct Answer is B
a. Mouth: The mouth is primarily responsible for the mechanical breakdown of food and the beginning of starch digestion via salivary amylase, but it is not a major site of nutrient absorption.
b. Small intestine: The small intestine is the primary site for nutrient absorption. The majority of carbohydrates, proteins, fats, vitamins, and minerals are absorbed here through its extensive surface area provided by villi and microvilli.
c. Large intestine: The large intestine primarily absorbs water and electrolytes. It is not a major site for nutrient absorption.
d. Stomach: The stomach is mainly involved in the mechanical and chemical breakdown of food, particularly proteins, but only a small amount of nutrients (e.g., alcohol, some drugs) are absorbed here.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
a. The volume of the cell decreases: When a red blood cell is placed in a hypertonic solution (solution with a higher concentration of solutes outside the cell compared to inside), water will move out of the cell through osmosis to equalize the concentration on both sides of the cell membrane. This movement of water causes the red blood cell to shrink (crenate).
b. The permeability of the cell membrane decreases: Incorrect. The permeability of the cell membrane to water remains relatively constant.
c. The permeability of the cell membrane increases: Incorrect. Osmosis is a passive process that doesn't require increased permeability.
d. The volume of the cell increases: Incorrect. A hypertonic solution will cause the cell to lose water and shrink.
Correct Answer is D
Explanation
a. Carrying oxygenated blood from the heart to the peripheral tissue: This describes the function of systemic arteries, not the pulmonary artery.
b. Carrying deoxygenated blood from the lungs to the heart: This describes the pulmonary veins, not the pulmonary artery.
c. Carrying oxygenated blood from the lungs to the left side of the heart: This describes the function of the pulmonary veins, not the pulmonary artery.
d. Carrying deoxygenated blood from the right side of the heart to the lungs: Correct. The pulmonary artery carries deoxygenated blood from the right ventricle of the heart to the lungs for oxygenation.
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