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Questions and Answers
In the presence of ______ and calcium ions, the blood prothrombin becomes thrombin.
thromboplastin
The resulting jellylike, red mass is the ______.
clot
Karl Landsteiner discovered two kinds of substances in human blood: ______ and antibodies.
antigens
As blood passes through the capillaries, water and dissolved substances filter through the capillary walls, forming what is known as ______.
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Excessive loss of ______ is fatal to a person.
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The ______ lymphatic duct receives lymph from head and right arm.
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The wall of the __________ ventricle is thicker than that of the right ventricle.
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The circulating fluid that supplies the needed material to all body cells and collects waste materials from them is called __________.
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The average heartbeat is around __________ times per minute.
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White blood cells, also known as __________, larger but fewer than RBCs.
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The shape of red blood cells is __________, which allows for maximum surface area for gas exchange.
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The tough sac of connective tissue that protects the heart is called the __________.
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A closed transport system is a system of ______ through which blood flows.
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The ______ bring blood from the heart in the vascular system.
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Waste materials from cells diffuse through ______ walls and into the bloodstream.
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The single innermost layer of ______ cells is found in blood vessels.
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The middle layer of ______ muscles is arranged in a circular manner around the vessel.
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