IGCSE O Level Biology Online Tests
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The MCQ: Blood entering the lungs contain very; "What is Respiration" App Download (Free) with answers: Little oxygen (O2) only; High carbon dioxide (CO2) only; Low carbon dioxide (CO2); Little oxygen (O2) and high carbon dioxide (CO2); to study e-learning courses. Practice What is Respiration Quiz Questions, download Apple eBook (Free Sample) for online college courses.
What is Respiration MCQ (PDF) Questions Answers 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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