Select the correct statement about lymph transport.
Lymph transport is faster than that occurring in veins.
Under normal conditions, lymph vessels are very high-pressure conduits.
Lymph transport depends on the movement of adjacent tissues, such as skeletal muscles.
Lymph transport is only necessary when illness causes tissue swelling.
The Correct Answer is C
A. Lymph transport is faster than that occurring in veins: Lymph moves much more slowly than blood in veins. Its movement relies on low-pressure mechanisms rather than a central pump like the heart, so this statement is incorrect.
B. Under normal conditions, lymph vessels are very high-pressure conduits: Lymphatic vessels operate under low pressure. They have thin walls and rely on external forces, valves, and vessel contractions to move lymph, not high internal pressure.
C. Lymph transport depends on the movement of adjacent tissues, such as skeletal muscles: Lymph flow is aided by skeletal muscle contractions, respiratory movements, and rhythmic contractions of smooth muscle in the vessel walls. These mechanisms compress lymphatic vessels, helping push lymph toward the thoracic duct and ultimately the bloodstream.
D. Lymph transport is only necessary when illness causes tissue swelling: Lymph circulation is continuous under normal conditions to maintain fluid balance and immune surveillance. Swelling during illness increases demand, but transport is always required.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. The vaccine contains the lymphocytes necessary to fight infection:Vaccines do not contain preformed lymphocytes. Instead, they provide antigens that stimulate the body’s own lymphocytes to develop immunity, allowing the adaptive immune system to respond effectively upon future exposure.
B. B-lymphocytes are unable to mount an immune response the first time they are exposed to a new pathogen:B cells can respond during the primary exposure, but the response is slower and less robust. Vaccines work by preparing the immune system for a faster, stronger secondary response, rather than because B cells are incapable of a primary response.
C. The secondary response of the adaptive immunity is faster and more efficient than the primary response:Vaccines stimulate memory B and T cells, which allow the immune system to mount a rapid and effective response upon subsequent exposure to the pathogen. This secondary response provides long-lasting immunity and is the primary reason vaccines are effective.
D. The vaccine contains the antibodies necessary to fight infection:Vaccines do not contain antibodies; they contain antigens or inactivated pathogens that stimulate the body to produce its own antibodies. Preformed antibodies would provide temporary protection but not long-term immunity.
Correct Answer is B
Explanation
A. Inversely; directly:Blood flow rises when the pressure gradient increases, so an inverse relationship does not fit normal cardiovascular physiology. The pressure gradient is the main driving force that propels blood forward, meaning higher gradients produce greater flow. Although resistance does influence blood flow, pairing it with an incorrect pressure-flow relationship makes this option inaccurate.
B. Directly; inversely:Blood flow increases when the pressure gradient increases because a stronger driving force moves blood through the vessels. Flow decreases as resistance increases, since narrowed or obstructed vessels limit the passage of blood. This pairing correctly reflects hemodynamic principles, where flow is enhanced by pressure and hindered by resistance.
C. Directly; directly:While blood flow does increase with larger pressure differences, it does not increase with increased resistance. Higher resistance, such as from vasoconstriction, reduces flow by making it harder for blood to move through the vascular system. The second relationship therefore prevents this option from aligning with physiological reality.
D. Inversely; inversely:Suggesting that flow decreases when pressure gradients rise conflicts with the fundamental mechanism that drives circulation. Although flow does decline with increased resistance, an inverse pressure relationship fully contradicts how blood is propelled through vessels, making this option invalid.
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