Question

Which of the following statements are correct in reference to the role of diaphragm during a breathing cycle in human beings? ​

Answer 1

Answer:

the answer is b

Explanation:

diaphragm helps in conscious breathing

Answer 2

The option which rightly matches with the role of diaphragm during breathing is (D) i.e., statements i , ii and iv .

Explanation :

(i) It helps to decrease the residual volume of air in lungs : during expiration , the diaphragm returns back to its resting position that is dome shaped , this reduces the volume of the lungs and hence the pressure inside increases .This results in expelling of the residual volume of gas remaining in the lungs.

(ii) It flattens as we exhale : True , the diaphragm is dome shaped hence, flattens as we inhale and relaxes as we exhale.

(iii) It gets raised as we inhale : False , raising of diaphragm would lead to restricting the expansion of volume of lungs and hence pressure inside will decrease and thus will not accommodate oxygen.

(iv) It helps the chest cavity to become larger : True , by increasing the volume and decreasing the pressure inside.