resp physiology Q2

breathing by mouth will allow more air to flow as nose breathing will resist the air flow due to the narrower passageway.

reduce the surface tension between alveoli and allow alveoli to expand.

Neontal RDS ( respiratory distress syndrome).

<p>True</p> Signup and view all the answers

<p>as volume increases, pressure decreases and vice versa. &gt;&gt; when volume in the thorax is decreased, the air in the lungs is under pressure and flow out (exhalation).</p> Signup and view all the answers

<p>because the alveolar pressure is equal to the atmospheric pressure so no air flow.</p> Signup and view all the answers

<p>diaphragm contract and external intercostal muscles contract, chest cavity expands&gt;increase volume of the lungs<decrease the alveolar pressure below the atmospheric pressure>air flows into the lungs down its conc gradient.</p> Signup and view all the answers

<p>diaphragm relaxes and external intercostal muscles relax, the chest and lungs recoil&gt;chest cavity contact&gt;alveolar pressure increases above the atmospheric pressure&gt;air flows out of the lungs&gt;lung volume decreases.</p> Signup and view all the answers

<p>the internal intercostal muscles and abdominal muscles contract&gt;reducing the size of chest cavity (reduced volume)&gt;(increased pressure)&gt; air forced to move out.</p> Signup and view all the answers

<p>during inhalation the diaphragm goes down to increase the volume of chest cavity. in exhalation it moves up decreasing the volume of chest cavity.</p> Signup and view all the answers