Breathing Mechanisms | MCQs

Explanation

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

It helping to expand and contract the lungs for breathing.

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

Explanation

Alveoli are tiny air sacs in the lungs where oxygen enters the blood and carbon dioxide is removed.

Their thin walls and rich capillary network make gas exchange efficient.

Explanation

Erythrocytes, or red blood cells, are responsible for carrying oxygen from the lungs to the body's tissues and carbon dioxide from the tissues to the lungs.

They contain the protein hemoglobin, which binds to oxygen and gives blood its red color.

Explanation

Aquatic animals may breathe air or extract oxygen that dissolved in water through specialized organs called gills, or directly through the skin.

Explanation

Residual volume is the amount of air that remains in the lungs after a maximum exhalation,

preventing the lungs from collapsing and allowing for continuous gas exchange.

Explanation

Lungs are part of the respiratory system,

a group of organs and tissues that work together to help you breathe.

The respiratory system's main job is to transport oxygen and remove extra carbon dioxide.

Explanation

Ventilation: the process of bringing oxygenated water or air into contact with a gas-exchange surface.

Explanation

The main function of the lungs is the process of gas exchange called respiration (or breathing).

In respiration, oxygen from incoming air enters the blood, and carbon dioxide, a waste gas from the metabolism, leaves the blood.