Organ

Key Stage 3

An organ is a part of an organism, made of several tissues, that does a specific job.

Organs are made of more than one different tissues that work together.

Only multicellular organisms can have organs because tissues are many of many cells.

An organ may have more than one job.

The organs may look different in different flowering plants.

The flower is a reproductive organ. The leaf is an organ used for photosynthesis. The stem is an organ which supports the plant. The roots are an organ that absorbs minerals and water from the soil.

These are all human organs which may look different in different mammals.

The skin is an organ that protects the body from infection.	The heart is an organ that pumps blood around the body.	The lungs are a pair of organs used for gas exchange.	The eye is a sensory organ used to see.

The ear is a sensory organ used to hear.	The mouth is an organ is used to start digestion of food.	The oesophagus is an organ that connects the mouth to the stomach.	The stomach is an organ that digests food.

The small intestine absorbs nutrients The large intestine absorbs water The rectum stores faeces The anus holds the faeces in.	The liver is an organ used to remove toxins from the blood.	Bones are organs in the body used for support and protection.	Muscles are organs that allow the body to move.