Why does the heart need its own blood supply
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Ответ:
The heart, just like any other organ, requires blood to supply it with oxygen and other nutrients so that it can do its work. The heart does not extract oxygen and other nutrients from the blood flowing inside it -- it gets its blood from coronary arteries that eventually carry blood within the heart muscle.
Explanation:
site, health.howstuffworks.com/human-body/systems/circulatory/heart5.htm
Ответ:
Traits
Explanation:
A trait is a distinct variant of a phenotypic character of an organism that may be inherited, environmentally determined or somewhere in between. For example, eye color is a character or abstraction of an attribute, while blue, brown and hazel are traits.