Which type of epithelial tissue is specialized for absorption and secretion in the gastrointestinal tract?
Simple squamous epithelium
Transitional epithelium
Stratified squamous epithelium
Simple columnar epithelium
The Correct Answer is D
A. Simple squamous epithelium: Simple squamous epithelium consists of a single layer of flat cells. It is specialized for diffusion and filtration, such as in the alveoli and blood vessels, rather than absorption and secretion in the gastrointestinal tract.
B. Transitional epithelium: Transitional epithelium is found in the urinary bladder and ureters, allowing for stretching and expansion. It does not play a primary role in absorption or secretion.
C. Stratified squamous epithelium: Stratified squamous epithelium has multiple layers for protection against abrasion, such as in the skin and esophagus, and is not specialized for efficient nutrient absorption or secretion.
D. Simple columnar epithelium: Simple columnar epithelium consists of a single layer of tall, column-shaped cells, often with microvilli and goblet cells. This structure maximizes surface area for absorption and allows secretion of mucus and digestive enzymes, making it ideal for the gastrointestinal tract.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Left atrium: The left atrium receives oxygenated blood from the pulmonary veins after it returns from the lungs. It then contracts to pass this blood into the left ventricle for systemic circulation.
B. Right atrium: The right atrium receives deoxygenated blood from the superior and inferior vena cava. It sends this blood to the right ventricle, which then pumps it to the lungs for oxygenation.
C. Left ventricle: The left ventricle receives oxygenated blood from the left atrium and pumps it through the aorta to the body. It does not directly receive blood from the lungs.
D. Right ventricle: The right ventricle receives deoxygenated blood from the right atrium and pumps it into the pulmonary artery to the lungs. It does not handle oxygenated blood from the lungs.
Correct Answer is A
Explanation
A. To filter blood and form urine: The kidneys filter blood to remove metabolic wastes, excess electrolytes, and water, producing urine. They also play a key role in regulating blood volume, blood pressure, and maintaining electrolyte and acid-base balance in the body.
B. To produce bile: Bile is a digestive fluid produced by the liver that emulsifies fats in the small intestine. The kidneys do not participate in digestion or bile production but focus on waste elimination and homeostasis.
C. To regulate heart rate: Heart rate is controlled by the autonomic nervous system and the pacemaker activity of the sinoatrial node in the heart. The kidneys can indirectly influence heart rate through blood pressure regulation, but they do not directly control cardiac rhythm.
D. To digest food: Digestion involves the breakdown of nutrients in the gastrointestinal tract through mechanical and chemical processes. The kidneys are involved in filtration, excretion, and homeostasis rather than digestion.
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