Hemophilia is a disorder in which bleeding is severe and prolonged due to a lack of clotting factor VIII. The factor activation cascade is interrupted at the Factor IX activation step. Which pathway is inhibited by this interruption?
A. The prothrombin clotting mechanism
B. The Hageman mechanism
C. The intrinsic clotting mechanism
D. The extrinsic clotting mechanism
Answer: C
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Which type of nerve would cause a blood vessel to constrict?
A. Sensory B. Somatic motor C. Cranial D. Autonomic E. Afferent
What makes a cell responsive to a particular hormone?
A. The site where the hormone is secreted B. The location of the gland that secretes the hormone C. The presence of a receptor for that particular hormone D. The location of the target cells in the body E. The chemical properties of the hormone
Why are valves located in veins but not in arteries?
A) Valves are located in veins because the wall is thin enough to accommodate the valve. B) Valves are located in veins to prevent blood from flowing backward because venous pressure is too low to keep the blood moving back toward the heart. C) Valves are located in veins because they have three wall layers instead of the two layers that arteries have. D) Valves are located in veins because veins are the only type of blood vessel where blood travels one-way instead of both ways in the vessel. E) Valves are located in veins because veins see the highest blood pressures so the valves protect the walls of the veins.
Which of the following is NOT a result of the renin-angiotensin-aldosterone system?
A. Blood pressure increases due to constriction of arterioles. B. Blood volume increases due to the effect of ADH. C. Blood pressure decreases due to dilation of arterioles. D. Blood pressure increases due to reabsorption of sodium and therefore water into the blood.