Tag: evs

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Questions Related to evs

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

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.

  1. Four

  2. Three

  3. Two

  4. One
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement (2) is correct because the chest expands, lowering intrapleural and intrapulmonary pressure, which causes air to enter. Statement (4) is correct since a healthy human typically breathes 12 to 16 times per minute. Statements (1) and (3) incorrectly reverse cause and effect.

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

The air we breathe out contains more

  1. Oxygen

  2. Carbon dioxide

  3. Water

  4. Chlorophyll
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

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

  1. Lungs

  2. Membrane

  3. Diaphragm

  4. Pleura
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

Which of the following statements is not correct?

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which of the following is correct

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. Ingestion

  2. Inhalation

  3. Exhalation

  4. Absorption
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

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

  1. Diaphragm

  2. Lungs

  3. Ribcage

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.