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Action of the Diaphragm During Breathing

Read the give...

Question

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

A

Two

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B

Three

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C

Four

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D

One

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Solution

The correct option is B Three
Statement (a), (c) and (d) are correct.
Contraction of external intercostal muscles lifts ribs and sternum up and outwards.
Inspiration in mammals is an active process. It occurs due to contraction of external intercostal muscles and diaphragm.

So, the correct answer is option-c.

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Similar questions

Q. Assertion :The abdominal muscles are primarily involved in generating pressure gradient between the lungs and the atmosphere. Reason: The strength of inspiration and expiration can be increased by additional muscles in diaphragm and intercostal muscles.

Q. Read the following statements regarding the mechanism of respiration and choose the correct option.

1

. Inspiration occurs only when there is negative pressure in the lungs with respect to the atmosphere.

2

. Expiration takes place only when intrapulmonary pressure is lower than atmospheric pressure.

3

. Pressure gradients are generated with the help of the diaphragm and intercostal muscles.

4

. Inspiration is initiated by the relaxation of the diaphragm.

5

. Contraction of the diaphragm reduces pulmonary volume and increases intrapulmonary pressure causing expiration.

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

Q. Which of the following sequences is correct to initiate inspiration?
(i) The contraction of external intercostal muscles raises the ribs and sternum
(ii) Volume of thorax increases in the dorso-ventral axis
(iii) Intrapulmonary pressure decreases
(iv) Diaphragm contraction
(v) Air rushes into lungs
(vi) Volume of thorax increases in the anterior-posterior axis

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