The human body has a system of organs that work together for the purpose of reproduction. The process of breathing allows these gases to be exchanged between the blood and lungs. In this process cells use oxygen gas and produce carbon dioxide gas – a waste product that must be removed from the body. Our bodies are made up of countless cells all requiring oxygen to carry out the important process of respiration. Our bodies are held together by connective tissue. They control movement, posture and assist the body with heat generation.
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It is articulated to allow free movement in conjunction with the skeletal muscles. The skeleton provides a framework on which the human body is arranged. The immune system is a protection mechanism composed of specialised cells, cell products, tissues, organs and processes within an organism that protect against pathogens.Ĭommonly known as the skin, this system wraps the body in a protective covering with a number of functions such as UV protection and temperature regulation, taking it well beyond being just a mere covering. Kidneys are blood purifiers filtering liquid from the bloodstream, removing undesirable substances (such as toxins) and returning those still required to the blood. The excretory system is composed of the kidneys (urine-forming organs), the bladder (temporary storage for urine) and channels for moving this liquid waste around. Endocrine glands produce hormones (chemical messengers) released into the blood and transported to target sites around the body.
Indigestible remains are then egested.Ĭomposed of a number of small organs distributed throughout the body, the endocrine system coordinates the metabolic activity of body cells by interacting with the nervous system. Ingested food is broken down into constituent nutrient molecules that are then absorbed into the bloodstream. This system resembles a long tube with attached organs. The heart is a pump forcing blood into a network of blood vessels allowing it to travel to organs and delivery sites requiring oxygen gas for respirationnutrients and the removal of waste substances. The heart and blood vessels make up this system.
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