question 1
what does you body produce when it is under stress or fear

question 2
how does noradrenalin affect the heart

question 3
by how much can noradrenalin speed up the heart rate

question 4
how does vigorous exercise affect the heart rate

question 5
what are receptors

question 6
what happens when you stop exercising vigorously

question 7
what is your body made up of

question 8
what is mitochondria

question 9
what is the reaction for cell respiration

question 10
what do ribosomes do

question 11
what do lysosomes do

question 12
what is the largest internal organ

question 13
what does the liver do

question 14
what does interdependent mean

question 15
what is metabolism

question 16
what are enzymes

question 17
how many enzymes are their in a humans body

question 18
what is a catabolic reaction

question 20
what is difusion