Process of Breathing and Gas Exchange

What does Boyle's Law state about the relationship between pressure and volume in a gas?

• Pressure increases as volume increases.

• Pressure decreases as volume decreases.

• Pressure remains constant as volume changes.

• Pressure increases as volume decreases.

According to Boyle's Law, if the volume of a gas is doubled, what happens to the pressure, assuming temperature remains constant?

• The pressure is halved.

• The pressure doubles.

• The pressure remains the same.

• The pressure quadruples.

What percentage of air movement at rest is attributed to the diaphragm during inspiration?

• 50%

• 75%

• 25%

• 90%

Which muscles are primarily responsible for elevating and expanding the ribs during inspiration?

• Diaphragm

• External intercostals

• Internal intercostals

• Abdominal muscles

During exhalation, which muscles relax?

• Diaphragm and external intercostals

• Internal intercostals and abdominal muscles

• Sternocleidomastoid and scalene

• Pectoralis minor and serratus anterior

What is the pressure in the lungs during inspiration?

• 762 mmHg

• 758 mmHg

• 760 mmHg

• 755 mmHg

Which of the following is an accessory muscle used during inspiration?

• Internal intercostals

• Abdominal muscles

• Sternocleidomastoid

• Diaphragm

What happens to the thoracic cavity during inspiration?

• It expands

• It contracts

• It remains the same

• It collapses

During expiration, what do the external intercostal muscles do?

• Contract

• Relax

• Stay tense

• Shorten

What is the role of the diaphragm during inspiration?

• It relaxes

• It contracts

• It stays still

• It expands