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Baroreceptor Reflexes

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*baroreceptors fire FEWER APs up vagus
*brainstem responds by stimulating sympathetic neurons down spinal cord and out to the SA node of the heart.
*NE is released from sympathetic neuron axon terminals onto the SA node heart muscle cells.
*NE binds to Beta-1 adrenergic receptors on the heart muscle.
*B-1 adrenergic receptors, when stimulated, open Ca++ channels on the heart muscle.
*Ca++ increases contraction rate and force of contraction.
*CO increases and BP goes up.