Gaseous Exchange and Pathway of air

Question 1

What is the pathway of air

Answer 1

Nose/Mouth
Pharynx
Larynx
Trachea
Bronchi
Bronchioles
Alveoli

Question 2

Definition of gaseous exchange

Answer 2

Oxygen to the lungs so it can diffuse into the blood to be transported to the cells and the removal of carbon dioxide from the capillary to the alveoli

Question 3

Definition of Diffusion

Answer 3

Movement of gas (CO2 and O2) from a area of a high concentration to a low concentration

Question 4

What are the characteristics of capillaries (5)

Answer 4

-Moist
-One cell thick- Slow (max diffusion)
-Semi permeable membrane
-Large surface area
-Vast amounts of capillaries

Question 5

What happens during gaseous exchange at the alveoli

Answer 5

• Diffusion- mouvement from an area of high concentration to low concentration
• High PO2 in alveoli
• Low PO2 in blood capillary
• O2 moves from alveoli to blood capillary
• High PCO2 in blood capillary
• Low PCO2 in the alveoli
• CO2 moves from blood capillary to alveoli

Question 6

What happens during gaseous exchange at the muscle

Answer 6

• Diffusion= Movement from an area of high concentration to an area of low concentration
• High PO2 in blood capillary
• Low PO2 in muscle
• O2 moves from the blood capillary to muscle
• High PCO2 in muscle
• Low PCO2 in blood capillary
• CO2 moves from the muscle to blood capillary