11A Paper 2 Gas Exchange

1. Fig. 5.1 is a photomicrograph of a transverse section through part of the bronchus of the human gas exchange system. The image is of a good resolution for a light microscope. The bronchial epithelium is a single layer of cells lining the lumen of the bronchus.

Identify the part labelled C.

1. Fig. 1.1 is an image of a transverse section through the trachea of the gas exchange system.

3. The perichondrium contains collagen fibres, composed of collagen molecules. Collagen is an example of one type of biological molecule.

State the name of the type of biological molecule of which collagen is an example.

1. Fig. 5.1 is a photomicrograph of a transverse section through part of the bronchus of the human gas exchange system. The image is of a good resolution for a light microscope. The bronchial epithelium is a single layer of cells lining the lumen of the bronchus.

Identify the part labelled A.

1. Fig. 1.1 is an image of a transverse section through the trachea of the gas exchange system.

Identify the part labeled B.

1. Fig. 5.1 is a photomicrograph of a transverse section through part of the bronchus of the human gas exchange system. The image is of a good resolution for a light microscope. The bronchial epithelium is a single layer of cells lining the lumen of the bronchus.

Identify the part labelled H.

Identify the part labeled D.

Soon after starting physical activity the concentration of carbon dioxide in the blood increases.

Name the process inside cells that produces carbon dioxide

Fig. 1.1 is a photomicrograph of a section through part of the lungs.

Identify the part labeled C.

State the effect on breathing of an increase in carbon dioxide concentration in the blood

1. Fig. 1.1 is an image of a transverse section through the trachea of the gas exchange system.

Identify the part labeled D.