Ventilation under Unusual Conditions Flashcards

1
Q

Which receptors detect acute hypoxia?

A

Peripheral chemoreceptors

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2
Q

What effect does increased ventilation have on the pH of cerebrospinal fluid?

A

Increased ventilation, decreases levels of CO2, so decreases the pH of CSF, making it more alkaline

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3
Q

Which cells export excess HCO3- from cerebrospinal fluid?

A

Choroid plexus cells

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4
Q

Why do people often get splenomegaly on descent from high altitudes?

A

. At high altitude, more RBCs are produced (polycythaemia)
. When coming back down, lots of excess RBCs need to be broken down, do the spleen becomes enlarged from all this extra work

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5
Q

Why do people get nitrogen narcosis on descent into water?

A

Nitrogen more soluble deeper in water, so more nitrogen dissolved in blood

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6
Q

Why do people get the bends when ascending in water?

A

Nitrogen becomes less soluble and forms bubbles as it comes out of solution

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7
Q

What is another name for orthostatic hypotension?

A

Postural hypotension

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