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

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

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

The word "becomes" is the correct form.

Explanation

World Asthma Day is observed on 3 May.

Asthma

: سانس لینے میں دشواری، دمہ

Theme 2022: Closing Gaps in Asthma Care

Theme 2023:  Asthma Care for all

Explanation

When CO2 levels in the blood increase, it triggers a response in the brain's respiratory centers to increase the rate of breathing.

This is because high CO2 levels indicate that the body is producing more waste products and needs to expel them through exhalation.

Explanation

Inspiration, or inhalation, involves the contraction of two main muscle groups:

Diaphragm: a dome-shaped muscle that separates the chest cavity from the abdominal cavity.

When it contracts, it flattens and increases the volume of the chest cavity.

Intercostal muscles: muscles located between the ribs.

When they contract, they pull the ribs outward and upward, increasing the volume of the chest cavity.

Explanation

• Respiration is an involuntary process in the way: when voluntary respiration is not possible.
• This means that breathing continues automatically, even when we're not consciously thinking about it, such as during sleep or unconsciousness.

Explanation

• Breathing (respiration) is a process that requires energy.
• But it does not release energy.

The characteristics of the breathing process are:

• It is a physical process.
• It occurs in the respiratory system.
• It requires energy.
• Enzymes are not involved.

Explanation

• During exhalation, the diaphragm relaxes and moves upwards.
• It decreasing the volume of the thoracic cavity and allowing air to leave the lungs.