The circulatory system consists of the heart and blood vessels which encompass all of the arteries, veins, and capillaries. The arteries carry oxygenated blood away from the heart, and veins return deoxygenated blood back to the heart.
The Digestive system
The digestive system consists mainly of the gastrointestinal (digestive) tract which includes the mouth, esophagus, stomach,small intestine, and large intestine (colon)
Integumentary System
The integumentary system consists of the skin, sweat and oil glands, nails, and hair. Skin is the largest organ in the body and is made up of three layers: the epidermis, dermis, and subcutaneous tissue.
Reproductive system
The reproductive system in men consists of the penis, scrotum, and testicles, and in women it consists of the ovaries, fallopian tubes, uterus, vagina, breasts, and mammary glands. Together there are four main functions of the reproductive system
