Bilateral cutting of vagus nerve causes ?
Decrease hea rate
Decrease respiratory rate
Increase hea rate
Decreased BP
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.