resp physiology Q2

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nose offer higher resistance that mouth, what does this mean?

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

whats the function of surfactant

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

name of Diases that occur related to surfactant diffidence

Neontal RDS ( respiratory distress syndrome).

air moves from an area of high pressure to an area pf low pressure down its concentration gradient

True (A) Signup and view all the answers

explain Boyle's Law in relation to lungs.

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

at rest (ventilation), diaphragm is relaxed, why?

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

explain of the mechanism of inhalation.

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

explain the mechanism of exhalation.

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

how the alveolar pressure increases during forced exhalation?

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

movement of diaphragm during inhalation/exhalation

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

Nose vs. Mouth Breathing Resistance

Breathing through the nose offers more resistance to airflow compared to breathing through the mouth due to the narrower nasal passage.

Surfactant Function

Surfactant lowers the surface tension in the alveoli, allowing them to expand and preventing collapse.

Neonatal Respiratory Distress Syndrome (NRDS)

A disease caused by insufficient surfactant production, making it hard to breathe.

Boyle's Law (Lungs)

As lung volume increases, pressure decreases, and vice versa. This governs air movement in and out of the lungs.