Tag: evs

Questions Related to evs

Read the following statements.
$(1)$ Chest expands because air enters into the lungs.
$(2)$ Air enters into the lungs because chest expands.
$(3)$ The muscles of the diaphragm contracts because air enters in the lungs.
$(4)$ A healthy human breathes $12-16$ times/minute.

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

  1. Four

  2. Three

  3. Two

  4. One

Show answer
Correct Option: A

The air we breathe out contains more

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

  1. Oxygen

  2. Carbon dioxide

  3. Water

  4. Chlorophyll

Show answer
Correct Option: B
Explanation:

  • The respiratory tract carries air from the mouth and nose to the lungs.
  • In the lungs, the gases oxygen and carbon dioxide are exchanged between the alveoli and the capillaries. 
  • Exhaled air contains less oxygen and more carbon dioxide, Hence, The air we breathe out contains more carbon dioxide.
So, the correct answer is 'carbon dioxide'.

Which of the following forms the floor of the chest cavity?

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

  1. Lungs

  2. Membrane

  3. Diaphragm

  4. Pleura

Show answer
Correct Option: C
Explanation:

  • The diaphragm is a thin skeletal muscle that sits at the base of the chest and separates the abdomen from the chest.
  •  It contracts and flattens when you inhale. 
  • This creates a vacuum effect that pulls air into the lungs.
  •  When you exhale, the diaphragm relaxes and the air is pushed out of lungs. Hence, diaphragm forms the floor of the chest cavity.
So, the correct answer is 'diaphragm'.

Which of the following statements is not correct?

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

  1. Taking in of oxygen is inhalation.

  2. Taking in of carbon dioxide is inhalation.

  3. Breathing rate is number of inhalation and exhalation in one minute.

  4. Giving out of carbon dioxide is exhalation.

Show answer
Correct Option: B
Explanation:

  • Respiration includes two processes: inhalation and exhalation.
  • Inhalation (also known as inspiration) occurs when air or other gases enter the lungs.
  •  And exhalation is the process by which the body expels carbon dioxide. Hence, Taking in of carbon dioxide is inhalation is a wrong statement.
So, the correct answer is 'Taking in of carbon dioxide is inhalation'.

Carbon dioxide in the expired air is more than that in inspired air because

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

  1. It is absorbed at the alveolar surface

  2. It is released at the alveolar surface

  3. Both A and B

  4. None of these

Show answer
Correct Option: B
Explanation:

Component                        Inspired air         Expired air
  $CO _2$                                    0.04%                   4%
Because carbon dioxide is released at the alveolar surface during the gaseous exchange between blood and alveoli.

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'.