control of blood pressure

Question 1

where are the main baroreceptors for detecting mean arterial blood pressure located?

Answer 1

in the walls of the aorta and the carotid artery

Question 2

which cranial nerve do the afferent fibres of the baroreceptors in the walls of the aorta follow?

Answer 2

the 10th cranial nerve (the vagus)

Question 3

which cranial nerve do the afferent fibres from the baroreceptor from the carotid artery follow?

Answer 3

the 9th cranial nerve (the glossopharyngeal nerve)

Question 4

what type of receptors are the baroreceptors?

Answer 4

stretch receptors

Question 5

what area of the brain do the baroreceptors feed back to?

Answer 5

the medullary cardiovascular control centre

Question 6

where about in the Medullary cardiovascular control centre do efferent SYMPATHETIC nerves leave from?

Answer 6

the lateral portion

Question 7

where about in the medullary cardiovascular control centre do efferent PARASYMPATHETIC (VAGAL) nerves leave from?

Answer 7

the medial portion

Question 8

what are the three things that happen when blood flow to the medullary CVCC decreases hugely?

Answer 8

• increase sympathetic stimulation of heart
• increase peripheral vasoconstriction
• hugely increases arterial pressure (up to 250mmHg)

Question 9

what are the two intrinsic methods of maintaining the safe flow of blood through local tissues id blood pressure increases?

Answer 9

• myogenic theory (stretch induced vascular depolarisation of vascular smooth muscle causes constriction)
• metabolic theory (increased persuasion f tissues due to increased BP increases O2 to tissues and ‘washes out’ the local factors causing dilation)