Topic 2 The Respiratory System: Lungs

Question 1

• Made of two sub-portions: left and right
• Membranous covers: pleurae
• 2 pleura layers: visceral and parietal pleura, space between is intrapleural space

Answer 1

Lungs

Question 2

• Smaller

- 2 lobes

Answer 2

Left Lung

Question 3

• Larger

- 3 lobes

Answer 3

Right Lung

Question 4

• Smaller to accommodate heart: on left side of chest

Answer 4

Left Lobe

Question 5

• Lines surface of lungs

Answer 5

Visceral Pleura

Question 6

• Lines inside of chest cavity

Answer 6

Parietal Pleura

Question 7

• Negative (lower) pressure relative to atmosphere
• When stabbed: air rushes causing lung to collapse
  a. Pressure of this decreases when inhale: as diaphragm contracts, lung cavity opens up and this increase in volume equates to decrease in pressure
• As pressure increases, volume decreases
• Inside lungs: as we inhale, volume of lungs expands as diaphragm drops: this creates negative pressure relative to atmosphere

Answer 7

Intrapleural Space

Question 8

• Diaphragm rises -> volume in lungs decreases -> pressure inside lungs increases -> air rushes out

Answer 8

Events during Exhale