Tag: the mechanism of breathing

Questions Related to the mechanism of breathing

Nitrogen in the inspired air is

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Required by the cells

  2. Mixed with the blood

  3. Remain almost unused

  4. All of the above

Show answer
Correct Option: C
Explanation:

Component              Inspired air            Expired air
Nitrogen                      79%                     79.6%

It remains almost unused.

Which of the following is correct

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Inspired air has more oxygen content

  2. Expired air has more CO$ _2$ content

  3. Expired air has high water vapour content

  4. All of the above

Show answer
Correct Option: D
Explanation:

Inspired air contains more oxygen whereas, the expired air contains more of carbon dioxide content as well as water vapours. Air enters with oxygen is diffused with carbon dioxide leading to the exchange of gases.

The act of breathing air into the body with the help of lungs is called

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Ingestion

  2. Inhalation

  3. Exhalation

  4. Absorption

Show answer
Correct Option: B
Explanation:

The act of breathing air into the body the help of lungs is called inhalation. By this process, fresh air enters into the lungs that contain large amount of oxygen.

So the correct answer is 'Inhalation'.

The large muscular sheet which forms the floor of the chest cavity is known as 

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Diaphragm

  2. Lungs

  3. Ribcage

  4. None of the above

Show answer
Correct Option: A
Explanation:
The diaphragm is a large muscular sheet which forms the floor of the chest cavity. It is a domed shaped structure made up of muscles which separate thoracic cavity and abdominal cavity.
So the correct answer is 'Diaphragm'.

The act of breathing out air from the lungs is called as

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Absorption

  2. Exhalation

  3. Excretion

  4. Inhalation

Show answer
Correct Option: B
Explanation:

The act of breathing out air from the lungs is called as Exhalation. By this process, the foul air i.e, (containing ${ CO } _{ 2 }$) is expelled out of the lungs.

So the correct answer is 'Exhalation'.

Which of the following maintains the volume of air in the chest cavity during breathing?

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Diaphragm

  2. Lungs

  3. Breastbone

  4. None of the above

Show answer
Correct Option: A
Explanation:

The diaphragm is a dome-shaped, muscular and membranous structure that separates the chest and abdominal cavities in mammals. It is the principal muscle of respiration that maintain the volume of air in the chest cavity during breathing.

So the correct answer is 'Diaphragm'.

Organs responsible for breathing in humans and fishes respectively are

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Lungs in both

  2. Gills and lungs

  3. Gills in both

  4. Lungs and gills

Show answer
Correct Option: D
Explanation:

Humans have lungs to carry out respiration. Lungs are ingrowths of the body wall and correct to the outside by a series of tubes and small openings.

Whereas grills are convoluted outgrowths containing blood vessels covered by a thin epithelial layer. They increase the surface area for gas exchange in fishes.
So the correct answer is 'Lungs and Gills'. 

During which of the following process the diaphragm moves down?

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Inspiration

  2. Expiration

  3. Coughing

  4. None of the above

Show answer
Correct Option: A
Explanation:

During inspiration, the diaphragm moves down. The contraction of muscle fibers of the diaphragm causes it to become flat and lowered down thereby increasing the volume of the thoracic cavity in anteroposterior axis, in rabbit or lengthwise in man.

So the correct answer is 'Inspiration'

If the $CO _2$ concentration in the blood increases, the breathing shall.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Increase

  2. Decrease

  3. Stop

  4. No affect

Show answer
Correct Option: A

Ram walked for 10 minutes and Shyam ran for 100 meters. Karan is at rest. Arrange in decreasing order of breathing rate.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Ram>Shyam>Karan

  2. Karan>Shyam>Ram

  3. Shyam>Ram>Karan

  4. All the 3 will have the same breathing rate

Show answer
Correct Option: C
Explanation:
Physical activity increases the pulse rate of the body. Higher is the pulse rate, higher will be the breathing rate of a person. Shyam who ran for 100m has more pulse rate than Ram, who only walked for 10 minutes and Karan, who is at rest. So the breathing rate is also higher for Shyam than Ram and Karan.
So the correct answer is 'Shyam>Ram>Karan'.