Lymphatic vessels recover about. __________ of the fluid filtered by capillaries.
5%
85%
25%
50%
The Correct Answer is B
A. 5%: This percentage is far too low to represent the volume of fluid returned by the lymphatic system. Only a small portion of capillary filtrate would be recovered at this rate, which would lead to significant interstitial fluid accumulation.
B. 85%: Approximately 85% of filtered fluid is reabsorbed directly at the venous end of capillaries, while the remaining 15% enters lymphatic vessels. The lymphatic system consistently retrieves this portion to prevent edema and maintain fluid balance.
C. 25%: A recovery of 25% would greatly overestimate the lymphatic contribution compared with the actual capillary reabsorption dynamics. This value does not match known physiological distribution of fluid return pathways.
D. 50%: If lymphatics recovered half of the capillary filtrate, the role of venous reabsorption would be significantly reduced, which does not reflect actual fluid handling. This percentage does not align with established cardiovascular–lymphatic physiology.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
A. Superior and inferior venae cavae:The venae cavae carry deoxygenated blood from the body into the right atrium, not toward the lungs. They are part of systemic venous return, not pulmonary circulation.
B. Aorta and pulmonary arteries:The aorta carries oxygenated blood from the left ventricle to the body, so it does not transport blood to the lungs. Only the pulmonary arteries are involved in carrying blood toward the lungs.
C. Pulmonary trunk and veins:The pulmonary veins carry oxygenated blood from the lungs to the left atrium, which is away from the lungs. Only the pulmonary trunk directs blood toward the lungs.
D. Pulmonary arteries and veins:While the pulmonary arteries carry deoxygenated blood to the lungs, the pulmonary veins return oxygenated blood to the heart. Only arteries carry blood toward the lungs.
E. Pulmonary trunk and arteries:The pulmonary trunk originates from the right ventricle and branches into the left and right pulmonary arteries, which transport deoxygenated blood to the lungs for oxygenation. This makes them the correct structures for carrying blood toward the lungs.
Correct Answer is E
Explanation
A. Heart:The heart is the central pump of the circulatory system, responsible for moving blood through the vessels. While critical, it alone does not constitute the complete circulatory system.
B. Blood vessels:Blood vessels provide the network of arteries, veins, and capillaries through which blood flows. However, without the heart to pump blood and the blood itself to carry gases and nutrients, vessels alone cannot sustain circulation.
C. Blood:Blood transports oxygen, nutrients, hormones, and waste products. While essential, blood cannot circulate on its own without a pump and vessels to guide its flow.
D. Heart and blood vessels:The combination of heart and vessels creates the structural framework for circulation, but the system is incomplete without blood, which carries the substances necessary to sustain life.
E. Heart, blood vessels, and blood:The circulatory system consists of the heart (pump), blood vessels (conduits), and blood (transport medium). All three components work together to deliver oxygen, nutrients, and hormones to tissues and remove wastes, making this the complete and correct answer.
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