Control of Breathing Flashcards

1
Q

What is the main stimulus of breathing?

A

The increase of carbon dioxide in the blood

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2
Q

Where are the central chemoreceptors found?

A

In the Medulla

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3
Q

Where are the peripheral chemoreceptors found?

A

In the aorta and the carotid bodies

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4
Q

Where in the body does the central chemoreceptors detect and respond to the lowering of pH?

A

Central chemoreceptors respond to the lowering in the cerebral spinal fluid.

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5
Q

Because of the direct link between the concentration of CO2 level in the blood and the pH of the CSF; a rise in co2 does what to the pH?

A

It lowers the pH

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6
Q

What do the peripheral chemoreceptors detect?

A

It detects the rises is arterial C02, but also react to significant falls in the level of oxygen in the blood.

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7
Q

What is pulmonary ventilation?

A

This is the process by which gases are exchanged between lungs and atmosphere. This involves two key processes.

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8
Q

What two key process are involved in pulmonary ventiliation?

A
  1. External- Lungs

2. Internal - Capillaries

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9
Q

Describe Boyle’s Law.

A

This describes the relationship between pressure and volume. It states that as volume increases, pressure decreases.

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10
Q

Is Inspiration active or passive transport?

A

It is an active process during normal quiet breathing.

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11
Q

Is expiration active or passive transport?

A

It is a passive process during normal quiet breathing.

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12
Q

Describe the negative feedback mechanism involved in breathing.

A

Receptors-Controllers-Effectors

Co2 (too much)-Medulla/pons-Rate/depth

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13
Q

Name the areas of the medulla that are referred to as the medullary rhythmicity area? (4)

A
  1. Dorsal respiratory group
  2. Ventral respiratory group
  3. Apneustic centre
  4. Pneumotatic/ pontine respiratory group
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14
Q

Where are the Dorsal respiratory group located?

A

Medulla

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15
Q

Where is the Ventral respiratory group located?

A

Medulla

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16
Q

Where is the Apneustic centre located?

A

Pons

17
Q

Where is the pneumatic located?

A

Pons

18
Q

What is the function of the Dorsal respiratory group in medullary rhythmicity area?

A

It integrates chemoreceptors information and signals VRG

19
Q

What is the function of Ventral respiratory group in medullary rhythmicity area?

A

It is the basic rhythm generator

20
Q

What is the function of Apneustic centre in medullary rhythmicity area?

A

It helps regulate length/depth of inspiration

21
Q

What is the function of Pneumotaxic in medullary rhythmicity area?

A

It is involved in regulation of apneustic centre and medullary rhymicity area.

22
Q

What does the term compliance mean in breathing?

A

Stretchiness

23
Q

What does the term lung compliance mean?

A

It is a measure of how easy the lungs inflate.

24
Q

What would happen without surfactant?

A

The wet surfaces of the lungs would stick together and not be able to expand and take part in breathing.

25
Q

What are the main muscles involved in normal quiet breathing in an adult?

A

Intercostal muscles and diaphragm