Hypovolemic shock decreases the systemic vascular resistance.
True
False
The Correct Answer is B
Correct answer: False
In hypovolemic shock, systemic vascular resistance (SVR) typically increases rather than decreases. When circulating blood volume drops, the body activates compensatory mechanisms through the sympathetic nervous system and the renin–angiotensin–aldosterone system. These responses cause peripheral vasoconstriction in an effort to maintain blood pressure and preserve perfusion to vital organs such as the brain and heart. The resulting vasoconstriction raises SVR, which helps temporarily support arterial pressure despite reduced cardiac output.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Correct answer: True
The cells of larger blood vessels, particularly those in the tunica media and tunica externa, are too far from the lumen for nutrients and oxygen in the rapidly flowing blood to diffuse effectively. To compensate, these cells are nourished by a network of tiny blood vessels called the vasa vasorum, which penetrate the outer layers of large arteries and veins. Without the vasa vasorum, the thick walls of large vessels would not receive sufficient oxygen and nutrients to maintain their structural integrity, highlighting the importance of this microvascular network.
Correct Answer is C
Explanation
A. To supply blood to the kidneys: The kidneys are primarily supplied by the renal arteries, which branch directly from the abdominal aorta inferior to the origin of the celiac trunk. The celiac trunk does not provide arterial blood flow to renal structures.
B. To carry deoxygenated blood to the inferior vena cava: The celiac trunk is an arterial vessel arising from the abdominal aorta. It carries oxygenated blood away from the heart, not deoxygenated blood toward the inferior vena cava, which is a venous structure.
C. To supply blood to the liver, stomach, and spleen: The celiac trunk is a major unpaired branch of the abdominal aorta that trifurcates into the left gastric, splenic, and common hepatic arteries. These branches supply oxygenated blood to foregut structures including the liver, stomach, spleen, and portions of the pancreas and duodenum.
D. To transport blood to the lower limbs: Blood supply to the lower limbs is provided by the common iliac arteries, which arise from the distal abdominal aorta. The celiac trunk functions much higher in the abdominal cavity and does not contribute to lower extremity circulation.
E. To drain blood from the digestive organs: Venous drainage from the digestive organs occurs through the hepatic portal vein and associated venous system, not the celiac trunk. The celiac trunk is part of the arterial supply, not venous return.
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