Regulation of BP

Question 1

Blood pressure is?

Answer 1

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

Question 2

3 components that influence blood pressure?

Answer 2

Heart activity
Blood volume
Blood vessels

Question 3

Increase in BP is caused by?

Answer 3

Increased HR
Vasoconstriction of arterioles ( small arteries )
Increase in blood volume

Question 4

Decrease in BP is caused by?

Answer 4

Decreased HR
Vasodilation of arterioles
Decrease in blood volume

Question 5

What is cardiac output?

Answer 5

Total volume of blood pumped out of the ventricle during 1 minute

Question 6

The parasympathetic activity does what to the HR?

Answer 6

Slows it down (paro / paralysed )

Question 7

The sympathetic activity does what to the HR?

Answer 7

Speeds up ( sym / speed )

Question 8

What does the vasomotor centre regulate?

Answer 8

Diameter of arterioles ( thickness )

Question 9

Feedback loop of blood pressure (homeostasis)?

Answer 9

Receptors - baroreceptors ( detects change in artery walls due to BP changes )
Controller - medulla ( signals sent to both centres )
Effector - vasomotor tone ( causes contraction of smooth muscles in arterioles )

Question 10

If blood pressure rises, what would result in a drop in blood pressure?

Answer 10

Inhibition of the sympathetic nervous system and excitation of the parasympathetic nervous system

Question 11

What would increase arterial BP?

Answer 11

Contraction of smooth muscle in arterioles