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Study Guide Answers

1.     What is the name of the muscular wall that divides the two halves of the heart?
     the septum
2.     ___________________ valves are located on both sides of the heart, and they control the flow of blood from the ventricles into either the aorta or the pulmonary artery.
     Semilunar
3.     What instrument do doctors use to listen to the heart?
     stethoscope
4.     Masses of nerve and muscle called "_________________" send out electrical signals that control your heartbeat.
     nodes
5.     What is another name for the sinoatrial node?
     pacemaker
6.     Why do capillaries have such thin walls?
     to diffuse gases, nutrients, and waste
7.     _____________ carry blood back to the heart after the blood has been processed by the capillaries.
     Veins
8.     Approximately 55% of blood is ______________________, a straw-colored, translucent liquid.
     plasma
9.     What protein structures, found in red blood cells, transport oxygen throughout the body?
     hemoglobin molecules
10.     In what process does a white blood cell ingest a dead or harmful cell?
     phagocytosis
11.     ____________________ are bits of cytoplasm that have broken off from cells in the bone marrow.
     Platelets
12.     Clotting factors form a threadlike substance called "_________________," which forms a mesh pattern to trap blood cells, thereby creating a clot.
     fibrin
13.     Your blood type is determined by the presence or absence of proteins called "_________________ " on the surface of your red blood cells.
     antigens
14.     Which cardiovascular disease is often called "hardening of the arteries"?
     atherosclerosis
15.     ______________ is a common blood problem that occurs when blood does not transport enough oxygen.
     Anemia
© Educational Video Network, Inc. 2005 - www.evndirect.com
Your leading source for curriculum-based educational videos and DVDs.