Integumentary System

Includes the epidermis, dermis, hypodermis, associated glands, hair, and nails. In addition to its barrier function, this system performs many intricate functions such as body temperature regulation, cell fluid maintenance, synthesis of Vitamin D, and detection of stimuli.

Made up of the bones that give structure to the human body. Bones protect and support vital organs and work with muscles to help the body move. Bone marrow is the soft inner part of many bones of the body.

Composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction.

Made up of your brain, spinal cord and nerves. It carries messages between your brain and the rest of your body.

The glands and organs that make hormones and release them directly into the blood so they can travel to tissues and organs all over the body. The hormones released by the endocrine system control many important functions in the body, Some glands in the endocrine system include:

• Pituitary gland: A pea-sized gland at the base of the brain that produces hormones that regulate many bodily functions, including growth and sexual development. It's sometimes called the "master gland".
• Pancreas: An organ in both the digestive and endocrine systems, the pancreas produces insulin and glucagon, which regulate blood sugar levels.
• Thyroid: A butterfly-shaped gland in the lower neck that produces hormones that control how cells burn fuel from food to make energy.
• Parathyroid: A set of four small glands behind the thyroid that control calcium and phosphorus levels, which are important for bone health.
• Adrenals: Two glands that produce adrenaline, also known as the "fight or flight" hormone, as well as corticosteroids that affect metabolism, heart rate, and other functions.
• Ovaries: Located on either side of the uterus, ovaries produce estrogen and progesterone, and also contain egg cells for reproduction.
• Thymus: A gland that produces white blood cells called T lymphocytes, which are important for a child's developing immune system. The thymus shrinks after puberty.

Consists of the heart, veins, arteries, and capillaries. These components make up two circulatory systems: the systemic and pulmonary circulatory systems.

Also called lymph system. The lymph system is part of the body's immune system and is made up of tissues and organs that help protect the body from infection and disease. These include the tonsils, adenoids (not shown), thymus, spleen, bone marrow, lymph vessels, and lymph nodes.

 Is the organs and structures in your body that allow you to breathe. It includes your lungs, nose, mouth and the tubelike structures (airways) that connect them. You also have muscles and blood vessels that support your respiratory system, and ribs to protect it.

Made up of organs that are important for digesting food and liquids. These include the mouth, pharynx (throat), esophagus, stomach, small intestine, large intestine, rectum, and anus.

The urinary system is divided into two parts. The upper urinary system includes the kidneys and ureters. The lower urinary system includes the bladder and urethra. The kidneys remove waste and extra fluid from the blood to make urine. The urine flows from the kidneys through the ureters to the bladder.

 The tissues, glands, and organs involved in producing offspring (children). In women, the reproductive system includes the ovaries, the fallopian tubes, the uterus, the cervix, and the vagina. In men, it includes the prostate, the testes, and the penis.

A complex network of organs, cells and proteins that defends the body against infection, whilst protecting the body's own cells. The immune system keeps a record of every germ (microbe) it has ever defeated so it can recognize and destroy the microbe quickly if it enters the body again.