Which of the following is correct
i) the diaphragm contracts - volume of chest cavity increased
ii) the diaphragm contracts - volume of chest cavity decreased
iii) the diaphragm expands - volume of chest cavity increased
iv) the diaphragm expands - volume of che st cavity decreased
a) i
b) i & ii
c) ii & iii
d) iv
Answers
Answered by
29
Answer - Option - A. (i)
When the diaphragm contracts - volume of chest cavity increased.
Extra Information :-
What is Thoracic Diaphragm :-
- The diaphragm is the dome-shaped muscular organ which serves as the main muscle of respiration and plays an important role in the process of breathing.
- Diaphragm separates the thoracic cavity from the abdominal cavity.
What is Thoracic cavity :-
- Thoracic cavity, also known as chest cavity and is separated from the abdomenal cavity by the diaphragm.
- It is surrounded by the ribs, the vertebral column and the sternum.
- There are two openings of thoracic cavity - thoracic inlet and thoracic outlet.
During Inhale :-
- Diaphragm contracts and flattens
- Volume of the thoracic cavity increased
- Pressure in the lungs decreased, and air rushes in.
During Exhale :-
- Diaphragm relaxes
- Volume of the thoracic cavity decreased
- Pressure in the lungs increased, and air rushes out.
Hence, When the diaphragm contracts - volume of chest cavity increased.
Answered by
11
option A is correct........
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