03.04 Organ systems

Organ systems consist of different organs working closely together to achieve a common function e.g. the cardiovascular system is made up of the heart and blood vessels.

Here we will introduce you to some of the body’s organ systems (Figure 3.8).

• Integumentary system consists of the skin and accessory structures such as hairs and glands. Skin is our largest organ and is the one that keeps us protected from pathogens by forming an external body covering.

• Skeletal system provides a framework for our body. It supports and protects our organs.

• Endocrine system is responsible for the production of hor m o ne s . This system consists of various glands, some of which include the thyroid gland, adrenal gland and the pancreas.

• Cardiovascular system is an extensive network of blood vessels and the heart which are responsible for delivery of nutrients and removal of cellular wastes throughout the body.

• Muscular system consists primarily of skeletal muscle which attaches to the bony framework and allows fo r movement. It is also important in the production of heat.

• Nervous system is the control system which sends electrical signals throughout the body. Three main parts of the nervous system include the brain, spinal cord and the nerves.

• Respiratory system is responsible for the continuous supply of oxygen needed for cellular function and expelling of carbon dioxide. It is the principal site for exchange of gases.

• Digestive system provides a site for chemical and mechanical digestion of food, absorption of nutrients and elimination of wastes.

Figure 3.8 Some of the major organ systems of the body (Copyright, QUT)