The heart is a muscular organ that pumps blood around your circulatory system. The circulatory system is the heart and all the blood vessels in the body which carry cells and substances to all its ...

The pink, white and red blob of tissue quivers in a vat of clear goop about the size of a kitchen sink. Graduate students ...

Every day, your heart tirelessly pumps blood through your circulatory system, delivering oxygen and nutrients to your body's tissues while removing waste products. The circulatory system ...

Brisk walking, running or jogging, swimming, cycling and jumping ropes are some of the best cardio exercises for your heart.

Veins between two capillary networks are portal systems. Closed circulatory system, but fluid constituents of blood leak out of capillaries and return to the heart by the second component of the ...