Class #7

Question 1

Stages of Respiration

Answer 1

1) Pulmonary Ventilation (inspiration)
2) External Ventilation
3) Respiratory Gas Transport
4) Internal Ventilation
5) Pulmonary Ventilation (expiration)

Question 2

Pulmonary Ventilation (inspiration)

Answer 2

• brain sends a signal to the inspiratory muscles to contract
• lungs expand vertically and horizontally
• pressure in lungs decreases (Boyle’s law)
• higher pressure outside (atmospheric pressure) rushes through the conduction zone into the lower pressure (expanded) lungs (pulmonary pressure)

Question 3

Boyle’s Law

Answer 3

if you increase volume, pressure decreases and vice versa

Question 4

External Ventilation

Answer 4

• gas exchange occurs
• Carbon dioxide (CO2) exits the blood
• Oxygen (O2) enters the blood

Question 5

Respiratory Gas Transport

Answer 5

• Movement of O2/CO2 around the body via the circulatory vascular system

Question 6

Internal Respiration

Answer 6

• gas exchange within cells throughout the body

Question 7

Pulmonary Ventilation (Expiration)

Answer 7

• brain send signal to the inspiratory muscles to stop contracting
• lungs passively return to original shape in quiet breathing (in forced breathing you engage abdominal muscles)
• pressure in lungs increases because the dimensions have shrunk (Boyle’s law)
• higher pressure inside lungs (pulmonary pressure) rushes through the conduction zone out into the atmosphere