1. Define the following terms :
(a) Circulatory system
(b) Blood
(d) Diapedesis
(f) Rh factor
(c) Heart
(e) Phagocytosis
Answers
Answer:
a) The system that contains the heart and the blood vessels and moves blood throughout the body. This system helps tissues get enough oxygen and nutrients, and it helps them get rid of waste products.
b) The red liquid that circulates in the arteries and veins of humans and other vertebrate animals, carrying oxygen to and carbon dioxide from the tissues of the body.
c) The passage of blood cells through the intact walls of the capillaries, typically accompanying inflammation.
d) An antigen found on the surface of red blood cells. Red blood cells with the antigen are said to be Rh positive (Rh+).
e) A hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation. In vertebrates there may be up to four chambers (as in humans), with two atria and two ventricles.
f) The ingestion of bacteria or other material by phagocytes and amoeboid protozoans.
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