Question

question 4 1 pts
____, a natural constituent of blood, acts as an antithrombin and prevents clots from forming in vessels.
spectrin
erythropoietin
serum
heparin
question 5 1 pts
a hematocrit of 56% would be an indication of:
leukocytosis.
anemia.
leukemia.
polycythemia.
question 6 1 pts
if damaged, which valve could allow blood to leak back into the right atrium?
tricuspid
aortic semilunar
bicuspid
pulmonary semilunar

Explanation:

• Question 4: Heparin is a natural anticoagulant in blood. It binds to antithrombin, enhancing its ability to inhibit clot - forming factors. Spectrin is a membrane - associated protein in red blood cells. Erythropoietin stimulates red blood cell production. Serum is the fluid part of blood after clotting.
• Question 5: Hematocrit measures the proportion of red blood cells. A hematocrit of 56% is high. Leukocytosis is high white blood cell count. Anemia is low red blood cell count. Leukemia is a cancer of white blood cells. Polycythemia is high red blood cell count.
• Question 6: The tricuspid valve is between the right atrium and right ventricle. If damaged, blood can leak back into the right atrium. The aortic semilunar valve is between the left ventricle and aorta. The bicuspid (mitral) valve is between the left atrium and left ventricle. The pulmonary semilunar valve is between the right ventricle and pulmonary artery.

Answer:

• Question 4: Heparin
• Question 5: polycythemia
• Question 6: Tricuspid