Tag: respiratory system of human

Quizzes (8) Questions (103)

Questions Related to respiratory system of human

Multiple choice zoology respiratory system of human mechanism of respiration respiratory cycle breathing and exchange of gas

Expiration is normally brought about by the relaxation of diaphragm

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The relaxation of external intercostal muscles and diaphragm leads to return of diaphragm, ribs, and sternum to resting position thus restoring thoracic cavity to pre-inspiratory volume. The pressure in the lungs increases and the air is exhaled.
So, the correct answer is option A.

Multiple choice zoology respiratory system of human mechanism of respiration respiratory cycle breathing and exchange of gas

The process of taking air in is called as

  1. Excretion

  2. Expiration

  3. Inspiration

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During inspiration, the diaphragm contracts and pulls downward while the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs.

Therefore, the correct answer is option C.

Multiple choice zoology respiratory system of human mechanism of respiration respiratory cycle breathing and exchange of gas

Expiration is the process of

  1. Taking air in

  2. Inhalation
  3. Releasing CO$ _2$

  4. Giving air out
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

During expiration, the diaphragm relaxes, and the volume of the thoracic cavity decreases, while the pressure within it increases. As a result, the lungs contract and air is forced out. 

Therefore, the correct answer is option D.