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Respiratory System > 04.1 Oxygen in the Blood > Flashcards

04.1 Oxygen in the Blood Flashcards

1
Q

When is haemoglobin in the R state?

A

When PO2 is high

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2
Q

What shape is an oxygen saturation curve?

A

Sigmoidal

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3
Q

What can cause an oxygen dissociation curve to shift to the right?

A

Low pH
Increased temperature
2-3 BPG

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4
Q

What happens to Hb in CO poisoning?

A

Increases the affinity of unaffected subunits.

Hb is either not saturated or cannot give up O2 at the tissues.

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5
Q

How can oxygen levels in the blood be measured?

A

Pulse oximetry

Arterial blood gas

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6
Q

What is pulse oximetry?

A

Detects the Hb saturation in pulsatile (arterial) blood by using wavelengths to measure the difference in HbO2 and Hb

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7
Q

What can pulse oximetry not tell you?

A

How much Hb is present in total (may be anaemic)

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8
Q

What is an ABG?

A

Arterial blood gas

Measures the partial pressures of gas dissolved in plasma

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9
Q

When is haemoglobin in the T state?

A

When PO2 is low

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Respiratory System (18 decks)

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