The Female Organs
The female organs consist of the external genitals, near the surface of the body between the thighs, and the internal genitals, inside the body. They connect with one another through the vagina and the cervix of the uterus. The external female organs are composed of the vulva and the vagina. The vulva has two large [...]
How Our Glands Work
All people, and animals, too, have glands that influence or control how their organs function. These glands are called endocrine glands, and they are located in many different places throughout the body.
An endocrine gland makes a chemical substance called a hormone, which it supplies directly into the bloodstream. The hormone travels through the blood vessels [...]
The Circulatory System
The Heart
The heart is a hollow organ, with four chambers, made up of muscles that continuously contract and relax. It is located beneath the breastbone in the chest, mostly on the left side, although a small portion extends over to the right side of the chest. The heart pumps the blood through the body. Without [...]