What is Blood?: Introduction (02:42)

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Blood circulates oxygen, hormones, and nutrients to cells. It also provides protection against foreign intruders and regulates temperature.

Temperature (01:21)

Reptiles, fish, and amphibians cannot regulate body temperature and search for sources of heat. Mammals and birds possess a thermostat to maintain body temperature.

Human Blood (04:31)

Blood contains plasma, water, mineral salts, proteins, waste products, hormones, and enzymes. Learn about hematocrits, white blood cells, and platelets.

Blood Transfusions and Summary (03:00)

Analyze the donor and receiver's blood to determine compatibility. Blood types include B, O, A, and AB. Blood circulates oxygen and nutrition to the body's cells while collecting waste products. It contains red blood cells, white blood cells, and platelets.

Credits: What is Blood? (00:39)

Credits: What is Blood?