Exposing skeletal muscle fibers to which substance disrupts the cells' troponin-tropomyosin complexes and prevents them from blocking the myosin binding sites on actin?
A) Glycerin
B) Calcium
C) Acetylcholine
D) Sodium
Answer: A
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Which correctly describes functions of protein C?
A. It activates clotting factor XII and platelets. B. It activates platelets and converts prothrombin to thrombin. C. It binds to tissue factor and activates clotting factor VII. D. It inhibits clot formation and inactivates factors Va and VIIIa. E. It inactivates thrombin and converts fibrinogen to fibrin.
Which organ removes most of the worn-out red blood cells from the circulation?
a. bone marrow. b. kidney. c. large intestine. d. pancreas. e. spleen.
Lymph contains red blood cells.
Answer the following statement true (T) or false (F)
In ________ a stimulus produces a response that opposes or negates the original stimulus
A) negative feedback B) positive feedback C) homeostatic equilibrium D) dynamic equilibrium E) homeostasis