Explain the baroreceptor reflex pathway.
Question 18 options:
and (2) efferent sympathetic nerve activity to blood vessels
This will increase the blood pressure and HR
Receptors increase their firing rate through the vagus and glossopharyngeal nerves
It, in turn, releases glutamate to neurons in the CVLM
Thus, this back and forth is continuous to try to keep the blood pressure within normal
These changes cause the heart rate and blood pressure to decrease
Which causes a release of glutamate from their nerve terminals
However, on the other side, parasympathetic is inactive and sympathetic is activated
Inhibition, thus, causes a decrease in (1) descending excitatory input to the IML
(2nd step) Blood pressure increases causing stretch receptors to activate
First, baroreceptors fire at a steady rate during normal blood pressure
This causes a release of GABA from neurons that synapse with the sympathoexcitatory neurons of RVLM
Signal reaches Nucleus of Tractus Solitarius (nTS) in brainstem, activating 2nd-order neurons