Examlex
Which one of the following has a definite shape and volume?
Genes
Units of heredity made up of DNA that determine specific traits by encoding proteins.
Endocrine Glands
Glands of the endocrine system that secrete hormones directly into the bloodstream to regulate body processes.
Hormones
Chemical messengers produced by the endocrine glands that regulate various bodily functions by acting on specific target organs.
Bloodstream
The flowing body fluid that circulates through the heart, arteries, capillaries, and veins, carrying nutrients and oxygen to and waste materials away from all body tissues.
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