Respiratory System Physiology

Intrapleural pressure is always __ than intrapulmonary pressure

• 4 mmHg less
• 4 mmHg more
• 64 mmHg less
• 14 mmHg more

When intrapulmonary pressure = intrapleural pressure, ___ has occurred.

• Inspiration
• Expiration
• Atelectasis
• Internal Respiration

The main muscle responsible for inspiration.

• diaphragm
• external intercostals
• abdominal muscles
• thoracic

Forced expiration is possible by using the...

• External intercostals
• Abdominals
• Diaphragm
• Phrenic nerve

The part of the brain responsible for respiration

• Pons
• Cerebrum
• Midbrain
• Cerebellum

Gas exchange between the alveoli and the blood is...

• External respiration
• Internal respiration
• Pulmonary ventilation
• Cellular respiration

Gas exchange utilizes ___.

• Osmosis
• Diffusion
• Active Transport
• Somatic Nervous Functions

As the diaphragm relaxes, volume ___ and intrapulmonary pressure ___.

• dec, inc
• dec, dec
• inc, dec
• inc, inc

Following diaphragmatic relaxation, as the pressure increases in the lungs, air flows __.

• out
• in
• across the alveoli
• nowhere

When the diaphragm contracts, it moves __ and volume ___.

• down, inc
• down, dec
• up, inc
• up, dec