Lab 10 - Cardiovascular Flashcards
Why does acetylcholine decrease blood pressure?
Sets free Nitric Acid and inhibits cardiac activity
What is the effect of compressing both left and right vagus nerve?
Respiration stops, then deeper and less frequent, heart rate increase
Which vasomotor centre shows spontaneous activity?
Pressor area
Where can you find the respiratory center/neorons?
Brain stem, pons close to vasomotor center in reticular formation
What is the role of apneustic center?
Inspiration
Which part do you have to stimulate of depressor nerve to cause vasoconstriction?
Craniolateral pressor area
Which part do you have to stimulate of depressor nerve to cause vasodilatation?
Caudomedial depressor area
What nerve has the afferent fibers from baroreceptor in the carotid sinus?
Hering’s nerve
Where are chemoreceptors located in the CNS?
Bottom of 4th chamber
Which nerve is efferent for the heart?
n. vagus
Where are volume receptors found?
In the lungs and in the capacitance system of circulation eg. Right atrial wall
What effect does Acetylcholine have on blood pressure?
Decrease blood pressure, because it sets free Nitric Acid and inhibits cardiac activity
Which nerve transmits signals from depressor area to heart?
Vagus nerve
Where are baroreceptors found?
Aortic arch and carotic sinus
Afferent nerve of Hering-Breuer reflex?
Vagus nerve
Where are expiratory neurons located in brainstem?
Ventral respiratory group
Which stump of the depressor nerve do you stimulate to decrease blood pressure?
Vagus nerve
Where are vasomotor centres located in the brain?
Close to respiratory centre in the reticular formation
Which area of the brain show spontaneous sympathetic activity?
The pressor area
What effect does short term stimulation of the vagus nerve have on blood pressure?
Heart rate decrease, blood pressure decrease for a while
Name the respiratory centres in the brainstem?
Dorsal and ventral respiratory groups
What happens if you compress carotid artery caudal to carotid sinus?
Slow increase of systemic blood pressure
What causes vagus apnoe?
Stimulating vagus, due to hering-breuer reflex
Which receptors do epinephrine effect?
Beta 2 adrenergic receptors, and alpha 1 as well
The 2 centers in the pons?
Pneumotaxic and apneustic
What happens if you compress carotid artery cranial to carotid sinus?
Increase blood pressure
Which afferent nerve transfers stimuli from n. vagus to bronchopulmonary centre?
Expiratory neurons of pons respiratory group
What happen to respiration when stimuli of n. vagus?
Irregular respiration
EDRF?
Endothelium derived reflex factor
EDCF?
Endothelium derived contractile factor
What does short time intrinsic control depend on?
Myogenic control of diameter of arterioles and metarterioles
Location and function of n. phrenicus?
C4 segment, function is modulated by inspiratory neurons
What is vasomotor center?
Centers in the brainstem responsible for circulation
