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Regulation Of Blood Pressure > Regulation of Blood Pressure > Flashcards

Regulation of Blood Pressure Flashcards

1
Q

What are the 3 influences of blood pressure?

A

Heart activity
Blood volume and viscosity
Blood vessels in particular dismayed of arterioles

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2
Q

What is blood pressure?

A

The force exerted by blood of the inner walls of blood vessels

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3
Q

When is the pressure in the arteries the highest?

A

Ventricular systole (contraction)

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4
Q

When is pressure in the arteries the lowest?

A

During ventricular diastole (relaxation)

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5
Q

How do you calculate blood pressure?

A

Cardiac output X Total peripheral resistance

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6
Q

What is total peripheral resistance?

A

Resistance in vessels of blood flow. The friction between blood and the walls of blood vessels

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7
Q

How do you work out cardiac output?

A

Heart rate X Stroke volume

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8
Q

What is cardiac output?

A

Total volume of blood pumped at a ventricle in a minute

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9
Q

What is stroke volume?

A

Amount of blood ejected from the left ventricle at each contraction

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10
Q

What system controls the short term control of blood pressure?

A

Nervous system

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11
Q

What is the system that controls long term blood pressure?

A

Endocrine system (hormones)

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12
Q

What is the atrial baroreceptor reflex?

A

Used in moment to moment control of atrial blood pressure

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13
Q

What is a baroreceptor?

A

Detect changes in stretch of artery walls due to blood pressure changes,Sending signals to centres in the medulla.

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14
Q

What activity slows the heart rate? (Nerve impulses)

A

Parasympathetic

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15
Q

Who activity speeds up the heart rate? (Nerve impulses)

A

Sympathetic

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16
Q

If you have a high peripheral resistance is your blood pressure higher or lower?

A

Higher

17
Q

What regulates the diameter of arterioles?

A

A group of neurones in the medulla called the vasomotor centre

18
Q

What happens in the cardiac centre when there is a decrease in blood pressure?

A 
Excites sympathetic impulses 
Inhibits parasympathetic impulses 
SA node excited 
Heart rate increases 
Cardiac output increases 
Blood pressure increases
19
Q

What happens in the vasomotor centre when blood pressure decreases?

A 
Excites sympathetic impulses
Smooth muscle in arterioles constricts 
Vasoconstriction 
Peripheral resistance increases 
Blood pressure increases
20
Q

What do antihypertensives do?

A

Help to control blood pressure

21
Q

Give some examples of antihypertensives drugs?

A 
Diuretics 
ACE Inhibitors
Beta blockers
Calcium channel blockers 
Beta adrenergic antagonists
22
Q

What should a normal blood pressure be?

A

120/80

Regulation Of Blood Pressure (2 decks)

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