Breathing | MCQs

Explanation

• The lungs are the organs responsible for exchanging oxygen and carbon dioxide through the process of respiration.
• They consist of air-carrying tubes (bronchi and bronchioles) and tiny sacs (alveoli) where gas exchange occurs.

Explanation

Explanation

Explanation

Respiration involves two main processes:

1. Mechanical Process (Ventilation):

• Breathing in (inhalation)
• Breathing out (exhalation)
• Movement of air in and out of the lungs

2. Biochemical Process (Respiratory Exchange):

• Exchange of oxygen and carbon dioxide between the lungs and blood
• Transport of oxygen and carbon dioxide through the bloodstream
• Cellular respiration (cellular metabolism)

Explanation

The diaphragm is a muscle that plays a crucial role in respiration.

It helping to expand and contract the lungs for breathing.

Explanation

A normal healthy human breathes about 11,000 litres of air in a day

breath air by the process of breathing                                               

Additional information:

The average adult at rest inhales and exhales something like 7 or 8 liters of air per minute.

Explanation

The process of taking air into the lungs is known as inspiration or inhalation, and the process of breathing it out is expiration or exhalation.

Air is inhaled through the mouth or the nose.

The sequence of air passage during inhalation is as follows:

Nostrils→pharynx→larynx→trachea→alveoli

Explanation

In this sentence, the structure requires the present tense because the statement is a general truth.

The word "becomes" is the correct form.

Explanation

Each human lung contains approximately 300 million alveoli, providing a large surface area for gas exchange.

These tiny air sacs help in the efficient exchange of oxygen and carbon dioxide in the lungs.

Explanation