Lab 10 - Cardiovascular

Question 1

Why does acetylcholine decrease blood pressure?

Answer 1

Sets free Nitric Acid and inhibits cardiac activity

Question 2

What is the effect of compressing both left and right vagus nerve?

Answer 2

Respiration stops, then deeper and less frequent, heart rate increase

Question 3

Which vasomotor centre shows spontaneous activity?

Answer 3

Pressor area

Question 4

Where can you find the respiratory center/neorons?

Answer 4

Brain stem, pons close to vasomotor center in reticular formation

Question 5

What is the role of apneustic center?

Answer 5

Inspiration

Question 6

Which part do you have to stimulate of depressor nerve to cause vasoconstriction?

Answer 6

Craniolateral pressor area

Question 7

Which part do you have to stimulate of depressor nerve to cause vasodilatation?

Answer 7

Caudomedial depressor area

Question 8

What nerve has the afferent fibers from baroreceptor in the carotid sinus?

Answer 8

Hering’s nerve

Question 9

Where are chemoreceptors located in the CNS?

Answer 9

Bottom of 4th chamber

Question 10

Which nerve is efferent for the heart?

Answer 10

n. vagus

Question 11

Where are volume receptors found?

Answer 11

In the lungs and in the capacitance system of circulation eg. Right atrial wall

Question 12

What effect does Acetylcholine have on blood pressure?

Answer 12

Decrease blood pressure, because it sets free Nitric Acid and inhibits cardiac activity

Question 13

Which nerve transmits signals from depressor area to heart?

Answer 13

Vagus nerve

Question 14

Where are baroreceptors found?

Answer 14

Aortic arch and carotic sinus

Question 15

Afferent nerve of Hering-Breuer reflex?

Answer 15

Vagus nerve

Question 16

Where are expiratory neurons located in brainstem?

Answer 16

Ventral respiratory group

Question 17

Which stump of the depressor nerve do you stimulate to decrease blood pressure?

Answer 17

Vagus nerve

Question 18

Where are vasomotor centres located in the brain?

Answer 18

Close to respiratory centre in the reticular formation

Question 19

Which area of the brain show spontaneous sympathetic activity?

Answer 19

The pressor area

Question 20

What effect does short term stimulation of the vagus nerve have on blood pressure?

Answer 20

Heart rate decrease, blood pressure decrease for a while

Question 21

Name the respiratory centres in the brainstem?

Answer 21

Dorsal and ventral respiratory groups

Question 22

What happens if you compress carotid artery caudal to carotid sinus?

Answer 22

Slow increase of systemic blood pressure

Question 23

What causes vagus apnoe?

Answer 23

Stimulating vagus, due to hering-breuer reflex

Question 24

Which receptors do epinephrine effect?

Answer 24

Beta 2 adrenergic receptors, and alpha 1 as well

Question 25

The 2 centers in the pons?

Answer 25

Pneumotaxic and apneustic

Question 26

What happens if you compress carotid artery cranial to carotid sinus?

Answer 26

Increase blood pressure

Question 27

Which afferent nerve transfers stimuli from n. vagus to bronchopulmonary centre?

Answer 27

Expiratory neurons of pons respiratory group

Question 28

What happen to respiration when stimuli of n. vagus?

Answer 28

Irregular respiration

Question 29

EDRF?

Answer 29

Endothelium derived reflex factor

Question 30

EDCF?

Answer 30

Endothelium derived contractile factor

Question 31

What does short time intrinsic control depend on?

Answer 31

Myogenic control of diameter of arterioles and metarterioles

Question 32

Location and function of n. phrenicus?

Answer 32

C4 segment, function is modulated by inspiratory neurons

Question 33

What is vasomotor center?

Answer 33

Centers in the brainstem responsible for circulation