Mechanisms of Breathing

Question 1

Function of respiratory system

Answer 1

Supply body with o2 taken from atmospheric air and dispose of co2 - RESPIRATION.

Question 2

What 4 stages are involved in respiration?

Answer 2

1. Ventilation
2. External respiration
3. Gas transport *
4. Internal respiration *
   * Respiratory system not responsible for these stages

Question 3

What is ventilation?

Answer 3

Movement of air in & out of lungs

Question 4

What is external respiration?

Answer 4

Diffusion of o2 from lungs to blood and co2 from blood to lungs.

Question 5

How do the dimensions of the thorax change during ventilation?

Answer 5

Vertical, transverse & antero-posterior diameter increase during inspiration.
These diameters DECREASE during expiration.

Question 6

What are the MOB during inspiration?

Answer 6

Ribs move up & out, diaphragm descends, sternum moves out.

Question 7

What are the MOB during exhalation?

Answer 7

Ribs move down & in, diaphragm ascends, sternum moves in.

Question 8

What muscles are involved in breathing?

Answer 8

Intercostals, diaphragm

external intercostals help produce inhalation

Question 9

What is the relationship between volume & pressure and what law is this known as?

Answer 9

As volume increases, pressure decreases = BOYLE’S LAW