Biology - Gas exchange in humans

Question 0

What happens to the intercostal muscles when breathing in?

And breathing out

Answer 0

IN: contract, and ribs move up and out

OUT: relaxes and returns to original position

Question 1

What happens to the diaphragm when breathing in?

And breathing out

Answer 1

IN: contracts and flattens

OUT: relaxes and becomes dome shaped

Question 2

What happens to the volume of the thorax when breathing in?

And breathing out

Answer 2

IN: increases

OUT: decreases

Question 3

What happens to the air pressure in the thorax when breathing in?
And breathing out

Answer 3

IN: decreases

OUT: increases

Question 4

What happens to the movement of air when breathing in?

And breathing out

Answer 4

IN: air rushes to the lungs

OUT: air forced out of lungs

Question 5

Why is the breathing rate higher after exercise?

Answer 5

More oxygen
To muscles
For respiration 
To remove Carbon Dioxide 
To remove lactic acid