Which of the following pressures is necessary for lymph to be produced?
Decreased osmotic pressure
Increased hydrostatic pressure
Decreased hydrostatic pressure
increased osmotic pressure
The Correct Answer is B
a: Decreased osmotic pressure - Decreased osmotic pressure would lead to fluid retention within the capillaries, not lymph production.
b. Increased hydrostatic pressure: Lymph is produced when there is an increase in hydrostatic pressure within the capillaries, which forces fluid and solutes out into the interstitial space, forming lymph.
c: Decreased hydrostatic pressure - Decreased hydrostatic pressure would result in decreased filtration of fluid from the capillaries, hindering lymph production.
d: Increased osmotic pressure - Increased osmotic pressure would draw fluid back into the capillaries, opposing lymph formation.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
a. Carrying stimulus to the spinal cord and the brain from all other parts of the body: This is the function of afferent neurons, not efferent neurons.
b. Conducting impulses from sensory neurons to motor neurons: This describes interneurons, which relay signals between sensory and motor neurons.
c. Regulating neuron function: This is a vague description and doesn't specifically relate to the primary role of efferent neurons.
d. Carrying stimulus away from the brain and spinal cord: This correctly describes efferent neurons, which carry motor commands from the central nervous system to muscles and glands.
Correct Answer is D
Explanation
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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