The common pathway of coagulation begins with the
A) activation of a clotting factor that converts fibrinogen to fibrin.
B) sticking of platelets to damaged tissue.
C) activation of a proenzyme exposed to collagen.
D) release of tissue factor by a damaged endothelium.
E) activating of a clotting factor that converts prothrombin to thrombin.
E) activating of a clotting factor that converts prothrombin to thrombin.
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In the small intestine, fat soluble vitamins are
a. digested by lipases b. actively absorbed c. absorbed in micelles d. absorbed through cotransport with sodium ions e. passively absorbed with anions
All the circulating red blood cells originate in the
A) heart. B) thymus. C) spleen. D) red bone marrow. E) lymph tissue.
Answer the following statements true (T) or false (F)
1. Hemoglobin can carry oxygen. 2. Hemoglobin can carry carbon dioxide. 3. Oxyhemoglobin carries oxygen from the cells to the lungs. 4. Pernicious anemia results from a lack of iron in the blood. 5. The loss of a large amount of blood can result in anemia.
________ transport is required to move a substance across a membrane against a concentration gradient.
Fill in the blank(s) with the appropriate word(s).