The Gas Exchange System - exam practice

Which statements about bronchioles are correct?

1 - they have ciliated cells

2 - they have goblet cells

3 - they have muscle tissue

Air moves in and out of human lungs through the trachea, which is lined with cells. The diagram below shows a section containing these cells.

Which statement about tracheal cells is correct?

Which characteristic of the human gaseous exchange surface and the lungs maintains the necessary concentration gradients for carbon dioxide and oxygen?

Which tissues may be found in bronchioles?

What would be seen in an electron micrograph of a bronchus wall?

1 - cartilage cells

2 - ciliated cells

3 - exocytotic vesicles

Which does not increase the efficiency of gaseous exchange in the alveoli?

Which statement correctly explains a feature of an efficient gaseous exchange surface?

An oxygen molecule diffuses from the air in an alveolus through cells to haemoglobin in a red blood cell.

What is the minimum number of cell-surface membranes through which this molecule must pass?

Which statements about the human gas exchange system are correct?

1 - the absence of cartilage in small bronchioles allows them to expand

2 - the walls of the alveoli are made of cuboidal epithelium

3 - alveoli secrete surfactant which reduces surface tension in the lungs

4 - the trachea and bronchi are supported by circles of cartilage

Which structure does not have smooth muscle tissue in its walls?