Deck 4 Control of breathing

Question 1

1 There are two ways in which breathing is controlled. What are they?

Answer 1

neural or chemical control

Question 2

2 At rest inspiration and expiration are two processes. What are they?

Answer 2

Inspiration at rest is an active process (the diaphragm contracts) while expiration at rest is a passive process (the diaphragm relaxes).

Question 3

3 Where do neurones exist?

Answer 3

These neurones exist in two areas of our medulla oblongata

Question 4

4 What does DRG and VRG stand for?

Answer 4

Dorsal respiratory group (DRG)
Ventral respiratory group (VRG)

Question 5

5 How are the DRG and VRG responsible for breathing?

Answer 5

They are responsible for rhythmic generation; allowing rhythm and continuous breathing

Question 6

6 Name another factor (not neural) that controls breathing?

Answer 6

Another factor that controls breathing is the changing levels of oxygen and carbon dioxide (acidity) in the blood

Question 7

7 The sensors that respond to these chemical fluctuations are called?

Answer 7

chemoreceptors

Question 8

8 Where can chemoreceptors be found?

Answer 8

They are found in the aortic arch and carotid artery

Question 9

9 What do chemorecetors detect?

Answer 9

detect changes in blood carbon dioxide levels as well as changes in blood acidity
Low concentration of oxygen (O2)
High concentration of carbon dioxide (C02)

Question 10

10 If chemoreceptors detact a change, what happens?

Answer 10

They send signals to the medulla oblongata that make changes (increase) breathing rate; causing diaphragm and intercostals to work harder