Respiration part 2

What happens during inhalation in terms of pressure inside the lungs?

• Positive Palv: air from inside of the lungs is forced out

• Negative Palv: air from atmosphere is forced to enter

• Neutral Palv: no air movement occurs

• Positive Palv: air from atmosphere is forced to enter

What is the role of positive Palv during exhalation?

• Air from atmosphere is forced to enter the lungs

• Air from inside of the lungs is forced out of the respiratory system

• Air pressure remains constant inside the lungs

• Air from inside of the lungs is forced to enter the bloodstream

According to Bernoulli's Principle, how does air flow?

• From low pressure to high pressure

• From high pressure to low pressure

• In a circular motion

• Randomly in all directions

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

• Volume and pressure are directly proportional.

• Volume and pressure are inversely proportional.

• Volume and pressure are unrelated.

• Volume and pressure both increase together.

What must happen to the alveolar pressure (P_alv) to bring air into the lungs?

• It must become positive.

• It must become negative.

• It must remain constant.

• It must equal atmospheric pressure.

What change occurs in the thoracic cavity and lungs to decrease P_alv?

• The volume decreases.

• The volume remains the same.

• The volume is enlarged.

• The volume fluctuates.

Which muscles are involved in increasing the dimensions of the thorax during inhalation?

• Abdominal muscles

• Intercostal muscles

• Cardiac muscles

• Pelvic muscles

What happens to P_alv as soon as the lungs begin to expand?

• It rises above P_atmosphere.

• It falls below P_atmosphere.

• It remains equal to P_atmosphere.

• It becomes zero.

What must be true for air to exit the respiratory system during exhalation?

• The P_alv must be lower than P_atmos

• The P_alv must be higher than P_atmos

• The P_alv must be equal to P_atmos

• The P_alv must be unrelated to P_atmos

What happens to the volume of the thoracic cavity and lungs to increase P_alv during exhalation?

• The volume must increase

• The volume must decrease

• The volume must remain constant

• The volume must fluctuate