Bilateral cutting of vagus nerve causes ?
Ans. is 'c' i.e., Increase hea rate Aoic nerve (a branch of vagus nerve) carries :? i) Baroreceptor afferent from Aoic sinus. ii) Chemoreceptor afferent from Aoic bodies. Bilateral sectioning of vagus nerve causes increase in hea rate and BP due to two reasons :? i) Abolition of baroreceptor discharge of aoic sinus on RVLM - causing increasing in sympathetic output. ii) Inhibition of nucleus ambiguous - causing decreased parasympathetic tone. Effect on chemoreceptors afferent is minimal as chemoreceptors are stimulate by low PO, and normally they have no dischange.
Decrease hea rate
Decrease respiratory rate
Increase hea rate
Decreased BP