Examlex
The ______ is a security technique associated with the use of credit cards at the time of purchase that checks additional digits printed on the back of the credit cards.
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.
Amphibian Heart
A three-chambered heart found in amphibians, featuring two atria and one ventricle for circulation.
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