Which of the following occurs when inspiratory muscles contract
Chest cavity compresses the lungs.
Length of the thoracic cavity decreases.
Diameter of the thoracic cavity increases.
Diaphragm rises up in the abdomen
The Correct Answer is C
a: Chest cavity compresses the lungs - This is incorrect; during inspiration, the chest cavity expands, not compresses.
b: Length of the thoracic cavity decreases - This is incorrect; during inspiration, the thoracic cavity increases in length as it expands.
c. Diameter of the thoracic cavity increases. When inspiratory muscles contract, such as the diaphragm and external intercostal muscles, the thoracic cavity expands, increasing its volume. This expansion decreases the pressure within the lungs, causing air to flow in (inspiration).
d: Diaphragm rises up in the abdomen - This is incorrect; during inspiration, the diaphragm contracts and moves downward, not upward.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
a. Formation of polar bodies: Formation of polar bodies occurs only in oogenesis, not in spermatogenesis.
b. Meiosis: Correct. Both oogenesis and spermatogenesis involve meiosis, the process of cell division that reduces the chromosome number by half.
c. Development of a Graafian follicle: This is specific to oogenesis. The Graafian follicle is the mature ovarian follicle.
d. Fertilization: Fertilization is the union of sperm and egg, not a process that occurs during the development of either gamete.
Correct Answer is D
Explanation
a. Activation of plasmin: Plasmin is involved in breaking down blood clots, not in their formation. It is part of the fibrinolytic system.
b. Activation of heparin: Heparin is an anticoagulant that prevents clotting; it is not required for blood clotting.
c. Adequate levels of potassium: Potassium is important for cellular function but does not play a direct role in blood clotting.
d. Adequate levels of calcium: Calcium ions are essential for various steps in the blood clotting cascade, including the activation of certain clotting factors.
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