3.6 Respiratory II Flashcards Preview

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Flashcards in 3.6 Respiratory II Deck (14):
1

Tidal volume

What you actually use, what you breathe in and out normally (500mls)

2

Vital capacity

What you could use (4500-5000 mls)

3

Alveolar ventilation

Estimate of gas exchanged in the alveoli, subtracts off dead space (VD) (volume of non-exchange airways)

4

AV =

Respiratory rate (RR) x (Tidal volume - Dead space volume)

5

What (in brain) regulates ventilation?

The respiratory center

6

Exercise… ↑ pCO2  ↓ plasma pH  -->
central & peripheral chemoreceptors send afferent signals to the…

Medullary respiratory center

7

Medullary Respiratory Center

Controls alveolar ventilation by impacting breathing rate (RR) and depth (TV)

8

Medullary respiratory system talks to... (Effectors)

1) Diaphragm: contraction force increases volume of thoracic cavity
2) Intercostal muscles: Expand / contract rib cage, expands volume

9

When the body fails to match alveolar ventilation to tissue metabolism…

-Hypoventilation
-Hyperventilation

10

Hypoventilation of the alveolar space leads to..

Respiratory acidosis

11

Respiratory acidosis

A decrease in AV (Alveolar ventilation) that results in an increase of plasma CO2 (Above normal), causes decrease in pH

12

Hyperventilation in the alveolar space leads to...

Respiratory Alkalosis

13

Respiratory alkalosis

Increase in AV that results in a decrease in plasma CO2, basic blood

14

Alveolar ventilation must...

Match metabolic rate to keep blood pH constant