Principles of organisation

Question 1

The body

Answer 1

Cells- the building block of life
Tissues- a group of cells with a similar structure and function, e.g. muscle tissue
Organs- are collections of tissue performing specific functions. E.g. the stomach
Organs combine to make an organ system. E.g. the digestive system
Lots of organs make up the organism

Question 2

The digestive system

Answer 2

Mouth- takes in food, breaks it down with teeth and mixes it with saliva
Oesophagus- transports the food to the stomach.
Stomach- churns the food and mix it with hydrochloric acid.
The small intestine- continues to digest and absorbs small soluble, molecules
Large intestines- are where water is absorbed from undigested material
Rectum- where faeces are stored
Anus- excretes faeces

Question 3

The lungs

Answer 3

gas exchange takes place in the alveoli, surrounded by capillary.