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Jamie Respiration Functionality > Control of Ventilation > Flashcards

Flashcards in Control of Ventilation Deck (17)
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1
Q

What 2 nerves is breathing reliant upon?

A

Phrenic

Intercostal

2
Q

What is the role of the respiratory centres?

A

To set automatic rhythm of breathing and adjust it in response to stmuli

3
Q

What are the 4 factors that can modulate the rhythm of the respiratory sensors?

A

Emotion - via limbic system
Voluntary over-ride - via higher brain centres
Mechano-sensory input from the thorax
Chemical composition of the blood - detected by chemoreceptors

4
Q

Which of the factors that modulate the rhythm of respiratory sensors is the most significant?

A

The chemical composition of the blood

5
Q

What are the 2 main groups of neurons in the innervation of respiration?

A

DRG (Dorsal respiratory neurons)

VRG (Ventral respiratory neurons)

6
Q

What muscles to the DRG innervate?

A

Inspiratory muscles

7
Q

Which muscles do the VRG innervate? (4)

A

Expiratory muscles, tongue, pharynx, larynx

8
Q

Where are the central chemoreceptors located and what role do they play in ventilation?

A

Medulla

They are the primary ventilatory drive

9
Q

Where are the peripheral chemoreceptors located and what role do they play in ventilation?

A

Carotid and Aortic bodies

They are the secondary ventilatory drive

10
Q

What do the central receptors detect?

A

Changes in the concentration of hydrogen ions in the CSF

11
Q

What odes a rise in hydrogen ions in the CSF cause in ventilation?

A

Reflex stimulation of ventilation

12
Q

Can CO2 or H+ ions cross the blood-brain barrier?

A

CO2 can cross

H+ ions cannot cross

13
Q

When do peripheral chemoreceptors cause a reflex stimulation of ventialtion?

A

When there is a significant fall in arterial PO2 or rise in H+ ions

14
Q

Which chemoreceptors respond to changes in plasma pH?

A

Peripheral chemoreceptors

15
Q

What effect to barbiturates and opioids have on respiratory centres?

A

They depress respiratory centres

16
Q

Why is respiration inhibited during swallowing?

A

To avoid aspiration of foods or fluids into airways

17
Q

Why i swallowing followed by an expiration?

A

To dislodge food particles outwards from the glottis