Ventilation & Gas Exchange summaru

Question 1

Gas exchange in the lungs requires a

Answer 1

concentration gradient

Question 2

Ventilation (………) in the lungs and the continuous flow of blood in the capillaries helps to ensure that ………………………..

Answer 2

mass flow of gases

there is always a higher concentration of oxygen in the alveoli than in the blood

Question 3

The movements involved in breathing causes the air in the alveoli to change, which supplies ………………………… and takes away………..

Answer 3

fresh oxygen

c02

Question 4

The oxygen in the alveoli diffuses into the ………….. which are rapidly carried away in the blood and replaced by ;…………………….

Answer 4

oxygen-depleted red blood cells

Question 5

Exercise causes oxygen demands to increase which can be facilitated by an

Answer 5

increased rate of ventilation

Question 6

Passage of Air

Answer 6

Nose / mouth

Trachea (windpipe)

Bronchi

Bronchioles

Alveoli