All Human Anatomy and Physiology Resources
Example Questions
Example Question #91 : Circulatory Physiology
What is the process which prevents blood loss called?
hemostasis
intrinsic pathway
coagulation
hemophilia
hematopoiesis
hemostasis
Hemostasis is the number of reactions that are initiated to stop bleeding. Hemostasis means prevention of blood loss. Hematopoiesis is the formation of blood cells. Coagulation is the process of blood clotting that results in a fibrin mass. The intrinsic pathway is one of two pathways that initiate blood clotting. Hemophilia is a X-linked disorder that is caused by the absence of a clotting factor.
Example Question #92 : Circulatory Physiology
Which of the following cells play a role in response to allergens?
basophils
neutrophils
eosinophils
lymphocytes
platelets
basophils
Basophils are classified as granulocytes. Their granules release enzymes during an allergic response. Baspophils are similar to mast cells and release histamine and heparin. Eosinophils play an important role in parasitic infections. Neutrophils are the body's first line of defense against invading bacteria. They search out, kill, and phagocytize bacteria that are involved in infection. Platelets are fragments of a larger cell called a megakarocyte. Platelets help form blood clots and prevent blood loss. Lymphocytes are involved in specific immune responses and include natural killer cells, b-lymphocytes, and t-lymphocytes.