What is a tissue?

A tissue is a group of similar cells working together to perform a common function.

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What is an organ?

An organ is a group of different tissues working together to perform a common function.

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What is an organ system?

An organ system is a group of different organs working together to perform a common function.

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Explain, using an example, why the cardiovascular system is considered an 'organ system'.

The cardiovascular system is considered an organ system because it consists of a group of organs that work together to perform the common function of transporting substances around our body.


The blood contains the substances that need to be transported, the blood vessels contain the blood, and the heart provides the force to pump the blood around the body.


(for questions like this you need to give the definition of an organ system, but also explain it by using examples)

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What are the levels of organisation in organisms, from least complex to most complex?

organelles ➔ cells ➔ tissues ➔ organs ➔ organ systems

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Name as many organ systems as you can.

You don't need to know them all, but there are 11 organ systems in the body:


Respiratory system, nervous system, cardiovascular system, skeletal system, muscular system, endocrine system, lymphatic system, digestive system, urinary system, integumentary system, and reproductive systems (female and male).

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