cell organisation

How are cells organised

Specialised cells carry out a particular function. The process by which cells become specialised for a particular job is called differentiation .differentiation occurs during the development of a multicellular organism. Specialised cells organised to form tissues which from organs which form organ systems

What is a tissue

A group of similar cells that work together to carry out a particular function

Give examples of tissues

– Muscular tissue, which contracts to move whatever it’s attached to

– Glandular tissue, which makes and secrete substances like enzymes and hormones

-epithelial tissue, which covers some part of the body E.G.the inside of the gut

What is an organ

A group of different tissues that work together to perform a certain function

Give example of an organ

The stomach is an organ made of these tissues

-muscular tissue, which moves the stomach wall to churn up the food

– Glandular tissue, which makes digestive juices to digest food

-epithelial tissue, which covers the outside and inside of the stomach

What is an organ system

group of different organs working together to perform a Particular / common function

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.

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

organelles ➔ cells ➔ tissues ➔ organs ➔ organ systems

Explain using example why the digestive system is an organ system

because it consists of a group of organs that work together to perform a common function of digesting and absorbing our food

Example-the pancreas releases digestive enzymes which help to break down the food molecules while the small intestine absorbs the nutrients

Name some organ systems and organs

Organs -skin, teeth, spleen, bones, testes, lungs

Organ systems - immune system, nervous system, respiratory system, and endocrine system, urinary system