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Vital Capacity

Pick the corr...

Question

Pick the correct statement.

A

The contraction of internal intercostal muscles lifts up the ribs and sternum.

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B

The thoracic cavity is anatomically an air tight chamber.

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C

Healthy man can inspire approximately

500

ml of air per minute.

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D

During expiration, the intrapulmonary pressure is slightly below the surrounding atmospheric pressure.

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Solution

The correct option is B The thoracic cavity is anatomically an air tight chamber.
The thoracic chamber is formed dorsally by the vertebral column, ventrally by the sternum, laterally by ribs and lower side by the dome-shaped diaphragm, it is an air-tight chamber.
So, the correct option is 'The thoracic cavity is anatomically an airtight chamber.'

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Similar questions

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. 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

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. 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

Q. In the given mechanism, diaphragm/ sternum and intercostal muscles work together to____ the thoracic volume and thereby pulmonary volume; This leads to______ in intrapulmonary pressure to slightly______the atmospheric pressure, causing expiration.
Select the correct sequence of words to complete the above paragraph.

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