Overview of Blood
The primary function of blood is to supply oxygen
and nutrients as well as constitutional elements to tissues and to
remove waste products. Blood also enables hormones and other substances
to be transported between tissues and organs.
Problems with blood
composition or circulation can lead to downstream tissue malfunction.
Blood is also involved in maintaining homeostasis by acting as a medium
for transferring heat to the skin and by acting as a buffer system for bodily pH.
The blood is circulated through the lungs and body by the pumping
action of the heart. The right ventricle pressurizes the blood to send
it through the capillaries of the lungs, while the left ventricle
re-pressurizes the blood to send it throughout the body.Pressure is
essentially lost in the capillaries, hence gravity and especially the
actions of skeletal muscles are needed to return the blood to the heart.
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