Examlex
In 1939,the first steps toward the creation of an atomic bomb were taken by
Blood Pressure
The force exerted by circulating blood upon the walls of blood vessels, essential for the functioning of the circulatory system.
Hormones
Biochemical substances produced in small amounts by specialized cells in organisms, transported in tissue fluids to stimulate specific cells or tissues into action.
Hemocoel
The primary body cavity of most invertebrates, particularly those with an open circulatory system, containing circulating fluid (hemolymph) that directly bathes the organs.
Closed Circulatory System
A cardiovascular system where blood is enclosed within blood vessels and circulated throughout the body without direct contact with body tissues.
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