True about baroreceptors:
The baroreceptors are stretch receptors (i.e. ) -stimulated by distension; they discharge at an increased rate when the pressure in the carotid sinus and aoic arch rises. Woking range: The threshold for eliciting activity in the carotid sinus nerve is approximately 50 mm Hg; maximal activity occurs at approximately 200 mm Hg of mean aerial pressure Baroreceptors are more sensitive to pulsatile pressure than to constant pressure. A decline in pulse pressure without any change in mean pressure decreases the rate of baroreceptor discharge Discharges (veical lines) in a single afferent nerve fiber from the carotid sinus at various levels of mean aerial pressures, plotted against changes in aoic pressure with time. Baroreceptors are very sensitive to changes in pulse pressure as shown by the record of phasic aoic pressure. Baroreceptor stimulates NTS, CVC and CVLM (Caudal ventral lateral medulla) RVLM (rostro ventral lateral medulla) is inhibited by CVLM Inotropic effect: force of contraction Chronotropic effect: hea ratenee Dromotropic effect: Conduction Bathmotropic effect: excitability
Inhibits nucleus tractus solitarius
Can regulate mean aerial pressure less than 50 mmHg
Are mechanoreceptors
Not sensitive to pulse pressure
Cardiovascular System