IGCSE O Level Biology Online Tests
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What is Respiration Questions and Answers PDF Download
Air pressure in thorax increases in
- anaerobic respiration
- inspiration
- expiration
- digestion
Blood entering the lungs contain very
- little oxygen (O2) only
- high carbon dioxide (CO2) only
- low carbon dioxide (CO2)
- little oxygen (O2) and high carbon dioxide (CO2)
In expiration in process of respiration
- the diaphragm relaxes and arches upwards
- air enters the lungs
- ribs move upwards
- sternum moves up and away from backbone
Stimulus for breathing is
- lack of oxygen in blood
- excess of carbon dioxide in blood
- contraction of alveoli
- diaphragm movements
In anaerobic respiration (without O2) in mammals, the wastes are
- water
- ethanol
- lactic acid
- carbon dioxide
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