Exam 9: Cardiac Physiology

Describe haemostasis.

Platelets are important in the process of haemostasis.

Which of these statements correctly describes platelets?

Which of the following actions is NOT accomplished by thrombin?

If the haematocrit is 47 percent, this means that 47 percent of the whole blood consists of plasma.

Anaemia refers to a reduction in the oxygen-carrying capacity of the blood.

What is the function of plasma albumins?

Match the blood cell formation terms labelled a. through e. with their correct characteristic. (Options may be used more than once or not at all.) a.thrombopoietin b.erythropoietin c.colony-stimulating factor d.myeloid stem cell e.pluripotent stem cell -produced in the liver

What does exposed collagen in a damaged vessel do?

Match the haemostasis steps, labelled a. through j., with their correct characteristic(s). (Options may be used more than once or not at all.) a.converts fibrinogen to fibrin b.When platelets come into contact with this substance in an injured vessel wall, it causes them to adhere and aggregate. c.When activated, this substance digests the fibrin threads, causing dissolution of the clot. d.substance released by the platelet plug that causes more platelets to aggregate e.first step in haemostasis f.forms the meshwork of the clot g.a plasma protein activated by factor X h.second step in haemostasis i.released from injured tissues; activates extrinsic clotting pathway j.third step in haemostasis -blood coagulation

What leaves the blood after circulating for only a day or two, and becomes the large tissue phagocytes known as macrophages?

Which of these steps is NOT involved in haemostasis?

What are the different kinds of white blood cells, and how are they produced?

The red cell count is normally about how many million cells per cubic millimetre?

Being a cell fragment, a platelet lacks a nucleus and organelles and does not have any synthetic ability.

Match the blood cell formation terms labelled a. through e. with their correct characteristic. (Options may be used more than once or not at all.) a.thrombopoietin b.erythropoietin c.colony-stimulating factor d.myeloid stem cell e.pluripotent stem cell -gives rise to all leukocytes except lymphocytes

All types of white blood cells can be produced in the bone marrow as well as in lymphoid organs, such as the lymph nodes and tonsils.

Basophils are the least numerous of the leukocytes per cubic millimetre.

Which of the following correctly describes prostacyclin?

Platelets adhere to exposed collagen, forming a plug at the site of a vessel defect.