Cardiovascularity 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)
- What is the role of apneustic center?
(Inspiration)
- Where can you find the respiratory center/neorons?
(Brain stem, pons close to vasomotor center in reticular formation)
- 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)