Levels of organisation

Specialised cells

as organism develops cells differentiate to form different types of cells

as it differentiates it acquires different sub-cellular structures

KEY POINT: If cells are specialized they become more efficient at their job but lose the ability to do other jobs

-include sperm ,nerve and muscle cells

tissue

a group of similar cells with a similar structure and function

-muscle tissue

-blood

organ

a group of tissues working together to perform a specific function

-heart stomach leaf flower

KEY POINT- some simple animals do not have organs only tissues

organ system

group of organs that work together to perform a specific function

-digestive system

-respiratory system

-circulatory system

-reproductive system

-skeletal system

organism

a group of organ systems working together

-humans

-frogs

-oak tree

muscle tissue

-can contract to bring movement

glandular tissue

Can produce substances such as enzymes and hormones

epithelial

A body tissue that covers the surfaces of the body, inside and out

stomach

An organ containing muscle glandular and epithial tissue