body

Question 1

what is digestion?

Answer 1

where large insoluble molecules are broken down smaller soluble ones that can be absorbed into the bloodstream

Question 2

what are the different digestive enzymes and what do they do?

Answer 2

amylase - released salivary glands and pancreas - breakdown carbohydrates into simple sugars.

protease - released in stomach and pancreas - breakdown proteins into amino acids.

lipase- released in pancreas - breakdown fats and oils into fatty acids and glycerol

Question 3

what is the lock and key theory?

Answer 3

a modal to explain enzyme action enzymes proteins biological catalysts- increase chemical reactions without being used up

Question 4

what does the heart do?

Answer 4

pumps low oxygen/ high carbon dioxide blood to the lungs

Question 5

what do the two ventricles do?

Answer 5

the right ventricle pumps blood to the lungs where gas is exchanged takes place

the left ventricle pumps blood around the rest of the body.

Question 6

what is the resting heart rate controlled by?

Answer 6

it is controlled by a group of cells in right atrium.

Question 7

what are the features if the heart and are they oxygenated or de-oxygenated?

Answer 7

vena cava - de-oxy
right atrium- de-oxy
right ventricle - de-oxy
left ventricle - oxy 
left atrium - oxy
aorta- oxy

Question 8

what do lungs do?

Answer 8

in the lungs oxygen and carbon dioxide are exchanged in alveoli at the end of the bronchial tubes . the alveoli are surrounded by capillaries