WorksheetsBiology Air
Total questions: 10
Worksheet time: 6mins
What is the approximate percentage of oxygen in expired air?
0.04%
4%
16%
21%
What helps oxygen to be absorbed rapidly into the blood in the lungs?
Air breathed in has less oxygen than air breathed out.
Alveoli have thick walls and a large surface area.
Alveoli have thin walls and a large surface area.
The concentration of oxygen in the blood is higher than in the alveoli.
The diagram shows some structures in the human neck and thorax. The lining of tube Q has cilia. What is an important function of the cilia?
to help in the exchange of gases
to increase the internal surface area of tube Q
to moisten the air entering and leaving the lungs
to move mucus towards the throat
What is the path of carbon dioxide as it leaves the lungs?
alveolus → bronchiole → bronchus → trachea
alveolus → bronchus → bronchiole → trachea
trachea → bronchiole → bronchus → alveolus
trachea → bronchus → bronchiole → alveolus
What are the products of aerobic respiration?
Carbon dioxide and water
Lactic acid
Oxygen and glucose
methane
Where does respiration happen in the cell?
ribosomes
Cell membrane
Mitochondria
Nucleus
During inhalation, which is true?
The diaphragm curves and moves upwards
The thoracic cavity becomes smaller
Air pressure in the lungs increase
The rib cage moves down
During normal human respiration, glucose reacts with ___________ to produce energy.
nitrogen
oxygen
blood
water
The energy you get during respiration is needed for what three things?
growth, new cells, air
growth, repair, movement
new cells and movement
breathing and moving
What happens to your breathing rate when you exercise?
stays the same
increases
decreases
