Feedback Control - Cardiovascular

Question 1

what is blood prressure?

Answer 1

the outwards pressure exerted by blood on blood vessel walls

Question 2

what is a normal value for blood pressure?

Answer 2

<140/90

Question 3

what is systolic blood pressure?

Answer 3

pressure exerted by blood when the heart contracts

Question 4

what is diastolic pressure?

Answer 4

pressure exerted by the blood when the heart relaxes

Question 5

what is the definition of hypertensionn?

Answer 5

clinical blood pressure of 140/90 or more AND a day time average of 135/85 or higher

Question 6

what is pulse pressure?

Answer 6

the difference between systolic and diastolic blood pressure

Question 7

what is MAP?

Answer 7

average arterial blood pressure during a single cardiac cycle

Question 8

which is longer in a normal cardiac cycle - diastole or systole?

Answer 8

diastole

should be twice as long

Question 9

how do you calculate MAP?

Answer 9

[(2xdiastolic) + systolic] / 3

Question 10

what is a normal range for MAP?

Answer 10

70-105mmHg

Question 11

why does MAP need to be AT LEAST 60mmHg?

Answer 11

to perfuse the brain, heart and kidneys

Question 12

what type of feedback mechanism is the baroreceptor reflex for short term regulation of MAP?

Answer 12

negative feedback mechanism

Question 13

what is the sensor in the baroreceptor reflex?

Answer 13

baroreceptors

Question 14

what is the control centre in the baroreceptor reflex?

Answer 14

cardiovascular control centre in the medulla

Question 15

what are the effectors in the baroreceptor reflex?

Answer 15

heart

blood vessels

Question 16

what are the two types of baroreceptors?

Answer 16

carotid

aortic

Question 17

what are baroreceptors?

Answer 17

mechanoreceptors that are sensitive to stretch

Question 18

what happens to the firing rate of baroreceptors when MAP increases?

Answer 18

increases

decreases when MAP decreases