An organ is a team of different tissues that work-related together to do a details job.

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Organs space grouped together right into organ systems.

Examples of body organ systems ensnucongo.orgmpass the circulatory system and also the digestive system.

Layers of organisation

The person body is made up of plenty of cells, so that is an instance of a multicellular organism. A multicell organism has 5 layers of organisation, dubbed a hierarchy. here they are in order of snucongo.orgmplexity:

Organelles - tiny frameworks which carry out various features within a cell.Cells - the an easy unit of every living organisms.Tissues - groups of similar cells that job-related together to execute a certain function. For example, brain tissue, muscle tissue and also heart tissue.Organs - various tissues working with each other to bring out a certain function.Organ system - a team of offal that job-related together to carry out a job.


In an organ, different tissues work-related together to lug out a details function. These room the key organs, and also their main function:

The brain snucongo.orgntrols thoughts, memory and other organs. The heart pumps blood roughly the body. The lungs separate oxygen native the air and also remove carbon dioxide native the blood.The stomach helps to digest food.The intestines absorb nutrient from food.The liver removes poisons from the blood.The kidneys filter blood and also produce urine.The bladder shop urine.The skin protects and also snucongo.orgntains the other organs.

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Organ systems

Organs room organised right into organ systems. One organ mechanism is a team of offal that occupational together to carry out a job.

Key human organ systems:

The circulatory system has the heart, veins and also arteries. Its role is to carry substances in the blood, roughly the body. The respiratory system snucongo.orgnsists of the nose and the lungs. It takes in oxygen and removes carbon dioxide. The digestive system has the stomach and also intestines. The breaks under food and also absorbs nutrients.The reproductive system snucongo.orgnsists of the uterus and vagina in women, and also the penis and testes in men. Its role is to develop offspring. The musculoskeletal system has bones and muscles. It supports the body and allows movement. The immune system includes bone marrow. That protects the human body from infection.