C3: Control of breathing

Question 1

what do chemoreceptors do?

Answer 1

detect fluctuations/changes and send signals to the medulla oblongata/ respiratory control centre.

Question 2

what do chemoreceptors do during exercise?

Answer 2

detect change in blood CO2 levels and blood acidity

Question 3

where to find chemoreceptors?

Answer 3

-in the medulla oblongata(central sensor)
-in arteries(peripheral sensors)

Question 4

what is the medulla oblongata responsible for?

Answer 4

involuntary functions such as HR and breathing control

Question 5

where is the medulla oblongata?

Answer 5

-next to the spinal cord as it enters the brain

Question 6

explain neural control in a nutshell

Answer 6

-When the medulla oblongata receives a signal that change has been detected, it sends an impulse through the ACNS to the respiratory muscles

Question 7

where does the intercostal nerve send impulses to?

Answer 7

intercostal muscles

Question 8

where does the phrenic nerve send signals to?

Answer 8

diaphragm

Question 9

explain chemical control

Answer 9

-we have chemoreceptors that detect change
-chemoreceptors then send signals to the medulla oblongata to know that change has been detected

Question 10

explain neural control at rest

Answer 10

-Medulla oblongata(DRG) sends impulses to the respiratory muscles so they contract and air is breathed in.
-Signals stop and the muscles relax and we breath out

Question 11

explain neural control during exercise

Answer 11

-Medulla oblongata(DRG) sends faster and regular signals to the intercostal and accessory muscles to increase breathing rate
-Expiration is an active process so the medulla oblongata(VRG) sends signals to the internal intercostal muscles to force
exhalation