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WorksheetsGas Exchange in Humans
Total questions: 15
Worksheet time: 8mins
State the movement of air between the environment and the lungs via inhalation and exhalation.
(a)
Which is a pathway that air takes from the atmosphere to the gas exchange surface in the lungs?
Mouth → Larynx → Bronchus → Bronchiole → Alveolus
Mouth → Nose → Trachea → Bronchus → Alveoli → Bronchiole
Nose → Larynx → Trachea → Bronchus → Bronchiole → Alveolus
Nose → Trachea → Bronchus → Bronchiole → Alveolus
What are the features of a gas exchange surface?
Thick-walled, large surface area, many capillaries
Thick-walled, small surface area, few capillaries
Thin-walled, large surface area, many capillaries
Thin-walled, small surface area, few capillaries
Which is the function of the cartilage in the trachea?
Cleans the air as it moves to the lungs
Contracts to move air into the lungs
Increases resistance to air flowing to the lungs
Prevents the trachea collapsing
The percentage composition of air changes as it passes through the lungs because:
Carbon dioxide and water vapour are absorbed from the air
Carbon dioxide is absorbed and oxygen excreted
Oxygen is absorbed and carbon dioxide excreted
Oxygen is absorbed and nitrogen excreted
During inspiration, external intercostal muscles contract and internal intercostals muscles relax, true or false?
True
False
Where does gas exchange occur?
Between the air in the alveoli and the blood in the surrounding capillaries
Between the bronchioles and the blood in the surrounding capillaries
Across the surface of bronchi connected with the surrounding capillaries
Above the diaphragm
Which cells produce mucus?
(a)
Exercise increases both the rate and depth of breathing, true or false?
True
False
What is the difference in carbon dioxide concentration in inhaled and exhaled air?
More carbon dioxide in exhaled air than inhaled
More carbon dioxide in inhaled air than exhaled
No obvious different
Carbon dioxide in exhaled air diffuse more quickly
When we exercise, what detects the increase of carbon dioxide in the blood and sends a nervous impulse to the intercostal muscles? (Select all that apply)
Receptor cells
The lungs
The brain
None of the above
Why is it advantageous to have large numbers of alveoli?
Prevents blood blockage
Faster gas exchange as more oxygen and carbon dioxide can diffuse between cells
Provides a large surface area for gas exchange to occur across
Increases rate of diffusion between the air and blood in the surrounding capillaries
Inspiration and expiration occur due to changes of temperature in the thorax, true or false?
True
False
How do inspiration and expiration occur? (Select all that apply)
Changes of volume in the thorax
Changes of pressure in the thorax
Changes of humidity in the atmosphere
Changes in the rate of breathing
Alveoli and capillary cell walls are thin, true or false?
True
False
