Ribcage

Intercostal muscle

Diaphragm

Buccalpharyngeal cavity

The pressure in the buccal cavity decreases

The pressure in the buccal cavity increases

Operculum closes due to the pressure in the buccal cavity

No change in pressure in the buccal cavity.

The respiratory surface is moist

The respiratory surface is thin

The respiratory structure has a large network of capillaries

The respiratory structure is less permeable to oxygen

J, K, M, L

K, L, J, M

K, M, L, J

L, K, L, J

R: High, S: Low, T: High

R: Low, S: High, T: Low

R: High, S: Low, T: Low

R: Low, S: High, T: High

Carbon dioxide is transported as dissolved carbon dioxide in the blood.

Carbon dioxide is transported in the form of sulphate ion.

Transport of carbon dioxide is affected by temperature.

Carbon dioxide is transported as carboxyhaemoglobin.

The chance of getting lung cancer increases.

Difficulty in breathing reduces.

The efficiency in gaseous exchange reduces

Inflammation of the walls of airways.

Opening of mouth and operculum.

Closing of mouth and operculum.

The direction of water and blood flow through gills is the same.

The direction of water and blood flow through the gills is opposite.

I and II only

I, II and III only

III and IV only

All of the above

High air pressure in the lungs.

Large volume of thoracic cavity.

Internal intercostal muscles contract

Rib cage extended upwards and outwards.

I and II only

I, II and IV only

I, III and IV only

All of the above