Gaseous Exchange

Question 0

What happens when an animal breathes out?

Answer 0

Intercostal and diaphragm muscles relax. Pressure increases as volume decreases inside the lung and air is moved out

Question 1

What happens when an animal breathes in?

Answer 1

Intercostal muscles between the ribs contract. The diaphragm also contracts. The volume increases and there is Low air pressure in the thorax, air moves in.

Question 2

How does the negative pressure breathing aid work?

Answer 2

The air is pumped out of the chamber creating a vacuum lowering the pressure. As a result the patients chest would move up which increased the volume and decreased the pressure inside the chest. Air is drawn in. Then the chamber was filled with air increasing the pressure and lowering the volume so the air moved out

Question 3

How does the positive pressure breathing aid work?

Answer 3

Air is pumped into the lungs. Once inflated the air pressure stops. The lungs then deflate as the lungs move down forcing the air out.

Question 4

What are the advantages of positive pressure breathing?

Answer 4

Patient does not have to be placed inside an iron lung. Patient can move about and can be used at home.

Question 5

Disadvantages of positive pressure breathing?

Answer 5

Uncomfortable for user and hard for the user to eat and drink.

Question 6

Advantages of negative pressure breathing?

Answer 6

Breathes for patient and keeps them alive

Question 7

Disadvantages for negative pressure breathing?

Answer 7

Patient has to live in large chamber