Question

Select correct statements regarding human respiration:

(i) The typical oxygen saturation level of hemoglobin in arterial blood under normal physiological condition is 95-100%.

(ii) The area of the brain primarily responsible for generating basic rhythm of breathing is cerebrum.

(iii) The primary drive for respiration under normal condition is controlled by the level of CO2 in the blood. 

• A. Only (i) and (ii)
• B. Only (ii) and (iii)
• C. Only (i) and (iii)
• D. All the above statements are correct

Answer 1

Answer:

C. Only (i) and (iii)

Read Explanation:

• The respiratory system is made up of our lungs, airways (trachea, bronchi and bronchioles), diaphragm, voice box, throat, nose and mouth.
• Its main function is to breathe in oxygen and breathe out carbon dioxide.
• It also helps protect our from harmful particles and germs and allows us to smell and speak.
• The respiratory system's main job is to move fresh air into our body while removing waste gases.
• Once in the lungs, oxygen is moved into the bloodstream and carried through our body.
• At each cell in our body, oxygen is exchanged for a waste gas called carbon dioxide.

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