definitions

Question 1

define the term diffusion

Answer 1

the process whereby simple substances move across a membrane from an area of high concentration to low concentration

examples:
1. oxygen diffusing from the alveoli into the bloodstream
2. carbon dioxide diffusing from the blood into the alveoli
3. the products of digestion (glucose, amino acid, and fatty acid) diffusing out of the small intestine into the blood

conditions for effective diffusion:
- thin wall membrane
- high surface area
- moist
- good/high blood supply

Question 2

define the term field of view

Answer 2

how much you can see through a microscope

Question 3

define the term specialised cell

Answer 3

Specialised cells are cells that have a specific structure and function, adapted to perform a particular task within the body