The Respiratory System

Question 1

What are the 2 functions of the respiratory system?

Answer 1

~To get oxygen into the blood

~To remove carbon dioxide from the blood

Question 2

What are the 5 steps during inspiration? (Breathing in)

Answer 2

1. Intercostal muscles contract. Rib cage moves up and out.
2. Diaphragm contracts, moves down and flattens.
3. Volume of thorax increases
4. Pressure inside thorax decreases
5. Lungs inflate and draw air into the lungs

Question 3

What are the 5 steps during expiration? (Breathing out)

Answer 3

1. Intercostal muscles relax. Rib cage moves down and in.
2. Diaphragm relaxes and moves up
3. Volume of thorax decreases
4. Pressure inside thorax increases
5. Air pushed out of the lungs