Gas Exchange In Humans

Question 1

What is gas exchange

Answer 1

The process of taking in gases that are needed for life processes and getting rid of waste gases

Question 2

Where are gases exchanged

Answer 2

In the alveoli

Question 3

Process of inspiration

Answer 3

Intercostal and diaphragm muscles contract

Rib cage moves upwards and outwards

Increase volume in thoracic cavity increases

Lung pressure decreases

It’s an active process so requires energy

Question 4

Process of expiration

Answer 4

Intercostal and diaphragm muscled relax

Rib cage moves down and in

Volume of thoracic cavity decreases

Lung pressure increases

Passive process so doesn’t require energy

Question 5

Alveoli structure

Answer 5

Wall of alveolus made from a single layer of thin flat cells

Walls of alveoli contain the protein elastin which makes it elastic which helps the alveoli return to their normal shape after ventilation

Question 6

Gas exchange in the alveoli

Answer 6

Oxygen diffuses out the alveoli and into a compound called haemoglobin in the blood

Carbon dioxide diffuses into the alveoli from the blood