Which of the following is the first response in the process of hemostasis?
Blood clot formation
Platelet aggregation
Activation of prothrombin
Constriction of smooth muscle in blood vessels
The Correct Answer is D
a. Blood clot formation: This is one of the later stages of hemostasis, involving the formation of a fibrin clot to seal the wound.
b. Platelet aggregation: This occurs after the initial vasoconstriction and is part of the platelet plug formation phase.
c. Activation of prothrombin: This occurs in the coagulation phase where prothrombin is converted to thrombin, leading to the formation of a fibrin clot.
d. Constriction of smooth muscle in blood vessels: This is the first response, known as vascular spasm or vasoconstriction, which reduces blood flow to the area and minimizes blood loss.
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Related Questions
Correct Answer is A
Explanation
a. Secretes fluid to reduce friction between layers: This is correct. The pleural membranes secrete pleural fluid, which reduces friction between the visceral and parietal layers during breathing.
b. Secretes a substance that reduces surface tension of alveoli: This describes the function of surfactant, which is secreted by alveolar cells, not pleural membranes.
c. Secretes a substance to keep epithelial cells wet: This is a general description that doesn't specifically apply to pleural membranes.
d. Secretes fluid involved in protection from infections: While pleural fluid may have some protective roles, its primary function is to reduce friction, not directly to protect from infections.
Correct Answer is C
Explanation
a. Ovary: The ovary releases the ovum during ovulation, but fertilization does not occur here.
b. Uterus: The fertilized ovum implants and develops in the uterus, but fertilization occurs earlier.
c. Fallopian tube: Fertilization typically occurs in the ampulla of the fallopian tube, where the sperm meets the ovum.
d. Cervix: The cervix is the lower part of the uterus and is not involved in the fertilization process.
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