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Bronchi and Bronchioles

Which of the ...

Question

Which of the following occurs during inspiration?

A

Diaphragm contracts and flattens

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B

Intrathoracic pressure does not change

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C

External intercostals relax

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D

Thoracic volume decreases

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Solution

The correct option is A
Diaphragm contracts and flattens

This increases the thoracic volume and facilitates inhalation and the inflow of gases.

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Similar questions

Q. Select the correct events that occur during inspiration.
(a) Contraction of diaphragm
(b) Contraction of external intercostal muscles
(c) Pulmonary volume decreases
(d) Intra-pulmonary pressure increases

Q. How many of the following given statements are not correct w.r.t. the events that occur during inspiration?
(a) Relaxation of diaphragm
(b) Contraction of external inter-costal muscles
(c) Volume of thoracic cavity decreases
(d) Intra-pulmonary pressure increases

Choose the suitable option among the following given options.

Q. Assertion :Inspiration occurs due to muscular relaxation. Reason: During inspiration, the diaphragm and external intercostal muscle contract simultaneously.

Q. Identify the sequence of steps involved during inspiration in rabbit.
(A) Volume of thoracic cavity increases
(B) Contraction of external intercostal muscles moves the rib cage forward
(C) Diaphragm becomes flat
(D) Thoracic cavity expands drawing air into lungs.

Q. Read the given statements. How many of them are correct ?
a. Diaphragm contracts during inspiration.
b. Relaxation of external intercostal muscles lifts sternum upwards and outwards
c. Partial pressure of

O_{2}

in atmospheric air is higher than that in the alveoli, so

O_{2}

diffuses from atmospheric air into alveoli
d. During forceful expiration, abdominal muscles contract.
e. Inspiration in mammals is a passive process

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