Your heart, veins, capillaries, and arteries work together to

The cells that deliver oxygen to other cells are

Blood pressure is the pressure that blood exerts on your

How do pathogens enter your body through the skin?

When foreign material enters the body, one way the immune system responds is by

When skin gets damaged, the body releases histamines, which cause

You develop active immunity to a pathogen by

One function of the skin is to

Which structure in the skin helps control body temperature?

One way you can help you skin stay healthy is by

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