Respiratory 1

Question 1

Functions of the Respiratory
*
*
*
*
*
*
*

Air Passages
*
*
*
*
*
*
*

Answer 1

• System
• Gas Exchange
• Acid-Base balance
• Thermoregulation
• Immune function
• Vocalization
• Enhances venous return
• Mouth / Nose
• Pharynx
• Larynx
• Trachea
• Bronchi
• Bronchioles
• alveoli

Question 2

Alveoli
Type I Alveolar cells
-
Type II cells
-
* ↓
Macrophages
-

Answer 2

Type I Alveolar cells
- Make up the wall
Type II cells
- Secrete surfactant
* ↓ surface tension
Macrophages
- Immune function

Question 2

Bronchioles
what can they do? control? muscle?

Alveoli
site of? wall? surface area? contain what? pores of … connect… ? Help to what?

Answer 2

Bronchoconstrict or dilate
Control air flow
Smooth muscle

Site of Gas Exchange
Thin-walled
Large surface area for diffusion (75 m2)
contain fine elastic fibres
Pores of Kohn connect adjacent alveoli
Helps equalize air pressure

Question 3

Respiration
Ventilation
External Respiration
-
Gas Transport
Internal Respiration
-

Pressure Relationships in the Thoracic Cavity
Atmospheric (air) pressure (Patm)
… mm Hg at sea level
Respiratory pressures are relative to Patm
Alveolar pressure
Pleural pressure

Answer 3

Ventilation
External Respiration
- Gas exchange between alveoli and blood
Gas Transport
Internal Respiration
- Gas exchange between blood and tissues

Atmospheric (air) pressure (Patm)
760 mm Hg at sea level
Respiratory pressures
are relative to Patm
Alveolar pressure
Pleural pressure