System Descriptions


Blood is a fluid that carries oxygen and nutrients to cells and metabolic waste away from those cells.

Cardiovascular System

The main components of the cardiovascular system are the heart, blood, and blood vessels. This system transports oxygen, nutrients, hormones, and cellular waste throughout the body.

Digestive System

The digestive system is made up of the oral cavity, pharynx, esophagus, stomach, small intestines, and large intestines. In addition, there are a few organs that food does not actually pass through, but they contribute to the digestive process, which include the teeth, tongue, salivary glands, liver, gallbladder, and pancreas. The purpose of this system is to provide energy and nutrients to the body and excrete waste.

Endocrine System

The endocrine system is made up of glands that secrete hormones. Hormones are released into the bloodstream where they travel to tissue and generate a response. Hormones regulate metabolism, development, function, sleep, and mood. The glands that make up the endocrine system include the pineal, thyroid, adrenals, pituitary, parathyroid, pancreas, ovaries, and testes. These glands produce hormones such as cortisol, DHEA, estrogen, insulin, progesterone, testosterone, and adrenalin.

Immune System

The immune system is what fights infectious organisms and invaders. This system is made up of cells, tissues, and organs that work together to protect the body. The four main components that make up the immune system include the spleen, thymus, bone marrow, and lymph nodes.

Integumentary System

The integumentary system is made up of skin, hair, scales, feathers, hooves, and nails. This system protects the body from damage, such as loss of water or external harm. It also protects deeper tissue, excretes wastes, cushions, regulates temperature and senses pain or pressure.


The liver is an essential organ used for detoxification, protein synthesis, production of bile and hormones, stores glycogen, regulates biochemical reactions, and emulsifies fats. The gallbladder is a small organ that sits beneath the liver where bile is stored before it is released into the small intestine.

Lymph system

The lymphatic system is used to remove toxins from the body and fight infection. This system is made up of a group of organs, lymph nodes, lymph ducts, and lymph vessels that make and move lymph from tissues to the bloodstream. Lymph is a fluid made out of white blood cells that attack invaders in the body and it also contains proteins and fats. Lymph nodes produce immune cells that help to fight infection and filter lymph fluid. This system also includes the tonsils, adenoids, spleen, and thymus.


Metabolism breaks down nutrients to produce energy. Essential nutrients supply energy along with important chemicals that the body itself cannot synthesize. This process is essential for the upkeep, repair of body tissues, and for the efficient functioning of the body.

Musculoskeletal System

The musculoskeletal system is the system that allows the ability to move. This system provides form, support, stability, protection to vital organs, and movement to the body. It is made up of bones, muscles, cartilage, tendons, ligaments, joints, and connective tissues.

Nervous System

The nervous system is the part of the body that transmits signals between different parts of the body. These signals can be both voluntary and involuntary. The nervous system is made up of the brain and spinal cord, and nerves.


The pancreas is a glandular organ that affects both the endocrine and digestive systems. It produces important hormones such as insulin and glucagon and secretes pancreatic juice containing digestive enzymes that assist with the absorption of nutrients and digestion in the small intestine. These enzymes help to further break down the food we eat.

Respiratory System

The respiratory system is made up of airways, lungs, and the respiratory muscles. In this system the function is to supply blood with oxygen to all parts of the body.

Urogenital System

The urogenital system is a combination of the reproductive system and the urinary system. The reproductive system is used for procreation, and the urinary system is responsible for the formation and elimination of urine. These systems have common ducts that are used for excretion at different times.

Urinary System

The urinary system is composed of two kidneys, one bladder, and one urethra. The kidneys are the main organs of the urogenital system and used to filter out harmful substances and waste products from the body in the form of urine. Kidneys usually help maintain a balance of water and salt in the body, while also producing the hormones that promotes red blood cell production.

Reproductive System

Male reproductive system consists of testes, seminal vesicles, seminal ducts, prostate, and penis. The female reproductive system includes ovaries, fallopian tubes, uterus, vagina, and clitoris.