short term control of blood pressure Flashcards

1
Q

what is the driving force that pushes blood through circulation?

A

MAP- mean arterial pressure

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2
Q

what happens if MAP is too low

A

fainting

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3
Q

what happens if MAP is too high

A

hypertension

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4
Q

what is the The arterial baroreflex

A

one of the body’s homeostatic mechanisms that helps to maintain blood pressure at nearly constant levels

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5
Q

what are the other inputs to the medullary cardiovascular centres?

A
Cardiopulmonary baroreceptors
Central chemoreceptors
Chemoreceptors in muscle 
Joint receptors
Higher centres
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6
Q

what are the hormones that regulate blood pressure in the long term?

A

Renin - Angiotensin - Aldosterone system

Vasopressin

Atrial natriuretic peptide & Brain natriuretic peptide

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7
Q

whats the effect of Renin - Angiotensin - Aldosterone system on regulating blood pressure in the long term?

A

angiotensin II causes arteriolar constriction, and  increase  TPR
aldosterone increase Na+ reabsorbtion, and  increase  plasma volume

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8
Q

whats the effect of Vasopressin system on regulating blood pressure in the long term?

A

causes arteriolar constriction, and increase  TPR

increases water permeability of collecting duct, and   increase plasma volume

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9
Q

whats the effect of Atrial natriuretic peptide & Brain natriuretic peptide on blood pressure, long term?

A

causes arteriolar dilation,  and decrease  TPR

increase Na+ excretion (natriuresis), and decrease  blood volume

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10
Q

what is the Valsalva manoeuvre

A

forced expiration against a closed glottis

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11
Q

where is incease of thoracic pressure

A

aorta

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