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Select the correct events that occur dur...

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

A

(3) and (4)

B

(1), (2) and (4)

C

Only (4)

D

(1) and (2)

Text Solution

Verified by Experts

The correct Answer is:
D
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Increase in the volume of thoracic chamber in the dorsoventral axis is due to (A) Contraction of diaphragm (B) Contraction of external intercostal muscles (C) Relaxation of diaphragm (D) Relaxation of external intercostal muscles

In normal respiration, contraction of which of the following muscles leads to a decrease in intra pulmonary pressure?

Which of the following sequenes is correct to intite 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

Read the following steps of inspiration (A) Increases horacic volume (B) Air move into lungs (C) Contraction in diaphragm and EICM (D) Increases pulmonary volume (E) Lungs expand (F) Decreases the intra pulmonary pressure Find out the correct sequence of these steps

Consider the following four statements (a-d) and select the option which includes all the correct ones only :- (a) All the time of inspiration , contracion in diaphragm and external intercostal muscles take place. (b) Normal breathing is also called as abdominal breathing. (c ) Expiration during sneezing, coughing, yoga is normal expiratio during which IICM and abdominal muscles relax. (d) Inspiration can occur if the pressure within lungs (intra pulmonary pressure) is more than the atmospheric pressure.

Read the following statements (A) Relaxation of diaphragm and inter costal muscles (B) Increase in the volume of thoracic chamber (C) Lisfts up the sternum (D) Intra pulmonary pressure in higher than atmospheric pressure (E) Increase the pulmonary volume How many statement are correct about Expiration ?

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

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