Friday , June 5 2020

Human Bone

blood | Definition, Composition, & Functions

Blood, fluid that transports oxygen and nutrients to the cells and carries away carbon dioxide and other waste products. Technically, blood is a transport liquid pumped by the heart (or an equivalent structure) to all parts of the body, after which it is returned to the heart to repeat the process. Blood is both a tissue and a fluid. It is a …

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comparative anatomy | Definition, Examples, & Facts

Comparative anatomy, the comparative study of the body structures of different species of animals in order to understand the adaptive changes they have undergone in the course of evolution from common ancestors. Modern comparative anatomy dates from the work of French naturalist Pierre Belon, who in 1555 showed that the skeletons of humans and birds are constructed of similar elements arranged in the …

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human eye | Definition, Structure, & Function

Human eye, in humans, specialized sense organ capable of receiving visual images, which are then carried to the brain. A horizontal cross section of the human eye, showing the major parts of the eye, including the protective covering of the cornea over the front of the eye.Encyclopædia Britannica, Inc. Anatomy Of The …

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human reproductive system | Definition, Diagram & Facts

Human reproductive system, organ system by which humans reproduce and bear live offspring. Provided all organs are present, normally constructed, and functioning properly, the essential features of human reproduction are (1) liberation of an ovum, or egg, at a specific time in the reproductive cycle, (2) internal fertilization of the ovum by spermatozoa, or sperm cells, (3) transport of the …

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