The primary force driving fluid transport between the capillaries and tissues is
Lymphatic pressure
Osmotic pressure
Hydrostatic pressure
Blood pressure
The Correct Answer is C
A. Lymphatic pressure: Lymphatic pressure contributes to the return of interstitial fluid to the circulation but does not drive the primary movement of fluid between capillaries and tissues. Lymph flow is a secondary mechanism that helps maintain fluid balance after capillary exchange.
B. Osmotic pressure: Osmotic pressure, primarily from plasma proteins like albumin, draws water into the capillaries from the interstitial space. While important for reabsorption, it opposes hydrostatic pressure rather than being the primary force driving fluid out of capillaries.
C. Hydrostatic pressure: Hydrostatic pressure is the main force pushing fluid out of capillaries into the surrounding tissue. Generated by the pressure of blood against capillary walls, it drives filtration at the arterial end of capillaries and is the dominant factor in capillary-tissue fluid exchange.
D. Blood pressure: Blood pressure reflects systemic arterial pressure but is not the direct local force responsible for fluid movement at the capillary level. Hydrostatic pressure within individual capillaries is the specific driving force controlling tissue perfusion and filtration.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B"]
Explanation
The brachiocephalic trunk, also known as the innominate artery, is the first major branch of the aortic arch on the right side of the body. It serves as a primary conduit for oxygenated blood from the heart to the upper body. The trunk divides into two main arteries: the right subclavian artery, which supplies blood to the right upper limb, and the right common carotid artery, which delivers blood to the right side of the head and neck. This bifurcation ensures efficient perfusion of both the brain and the upper extremities.
Correct Answer is {"dropdown-group-1":"A"}
Explanation
A. Vascular tone: All blood vessels containing smooth muscle maintain a baseline level of partial contraction known as vascular tone. This resting state of constriction is regulated by autonomic input and local factors, allowing vessels to rapidly dilate or constrict as needed to regulate blood pressure and tissue perfusion.
B. Vasodilation: Vasodilation refers to an active widening of blood vessels beyond their baseline tone. It is a dynamic adjustment rather than a constant state, and not all vessels are continuously dilated under normal physiologic conditions.
C. Vasoconstriction: Vasoconstriction is also an active process in which vascular smooth muscle contracts further than baseline tone. It occurs in response to sympathetic stimulation or hormonal signals, but it is not the constant resting condition of all vessels.
D. Blood pressure: Blood pressure refers to the force exerted by circulating blood on vessel walls, not a property that vessels inherently “exhibit.” While vessels are exposed to blood pressure, the question relates to their intrinsic smooth muscle activity, which is vascular tone.
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