Question

question 1
1 pts
the physiological mechanism that dissolves clots is known as
hemostasis.
fibrinolysis.
erythroblastosis.
diapedesis.

question 2
1 pts
in the extrinsic pathway of stage 1 of the clotting mechanism, chemicals released from damaged tissues trigger the cascade of events that ultimately result in the formation of
calcium.
vitamin k.
prothrombin activator.
fibrin.

question 3
1 pts
erythrocytes begin their maturation sequence in red bone marrow from nucleated cells known as:
hemoglobin.
osteons.
erythroblasts.
hematopoietic stem cells.

Explanation:

• Question 1: Hemostasis is the process of stopping bleeding (including clot - formation), fibrinolysis is the process of dissolving clots. Erythroblastosis is related to erythroblasts (immature red blood cells) and diapedesis is the passage of cells through blood vessel walls.
• Question 2: In the extrinsic clotting pathway, chemicals from damaged tissues trigger the formation of prothrombin activator. Calcium is involved in the clotting process but not the end - product of the extrinsic pathway trigger. Vitamin K is involved in the synthesis of clotting factors. Fibrin is formed later in the clotting process (stage 3).
• Question 3: Erythroblasts are nucleated cells in red bone marrow that are part of the erythrocyte maturation sequence. Hemoglobin is a protein in erythrocytes. Osteons are structural units of bone. Hematopoietic stem cells can differentiate into many types of blood cells, but erythroblasts are more specific to erythrocyte maturation.

Answer:

• Question 1: fibrinolysis
• Question 2: prothrombin activator
• Question 3: erythroblasts