Biology- Organs (Year 8)



An organ is a group of different tissues that work together to do a particular job. Organs are grouped together into organ systems (e.g. circulatory system, and digestive system).

Layers of organisation:

The human body is made up of many cells, so it is a multi cellular organism. A multicellular organism has five layers of organisation, called a hierarchy. 

Organelles- tiny structures which carry out various functions within a cell.

Cells- the basic unit of all living organisms.

Tissues- groups of similar cells that work together to perform a specific function. For example, brain tissue, muscle tissue, and heart tissue.

Organs- different tissues working together to carry out a particular function.

Organ system- a group of organs that work together to do a job.


In an organ, different tissues


No comments have yet been made