12 Facts About Human body

Study of the human body involves anatomy, physiology, histology and embryology.

Human body is composed of elements including hydrogen, oxygen, carbon, calcium and phosphorus.

The body is host to about the same number of non-human cells as well as multicellular organisms which reside in the gastrointestinal tract and on the skin.

The heart works by pumping blood around the Human body allowing oxygen, nutrients, waste, hormones and white blood cells to be transported.

Paths of blood circulation within the human body can be divided into two circuits: the pulmonary circuit, which pumps blood to the lungs to receive oxygen and leave carbon dioxide, and the systemic circuit, which carries blood from the heart off to the rest of the body.

The immune system provides a mechanism for the Human body to distinguish its own cells and tissues from outside cells and substances and to neutralize or destroy the latter by using specialized proteins such as antibodies, cytokines, and toll-like receptors, among many others.

Integumentary system consists of the covering of the Human body, including hair and nails as well as other functionally important structures such as the sweat glands and sebaceous glands.

The human body has four limbs, a head and a neck which connect to the torso.

The Human body's shape is determined by a strong skeleton made of bone and cartilage, surrounded by fat, muscle, connective tissue, organs, and other structures.

All major bones, muscles, and nerves in the Human body are named, with the exception of anatomical variations such as sesamoid bones and accessory muscles.

Body consists of a number of Human body cavities, separated areas which house different organ systems.

Together, these systems regulate the internal environment of the Human body, maintaining blood flow, posture, energy supply, temperature, and acid balance.