baroreceptor

Examples of baroreceptor in the following topics:

• Short-Term Neural Control

  • Neural regulation of blood pressure is achieved through the role of cardiovascular centers and baroreceptor stimulation.
  • Vascular baroreceptors are found primarily in sinuses (small cavities) within the aorta and carotid arteries.
  • There are also low-pressure baroreceptors located in the walls of the venae cavae and right atrium.
  • When blood pressure drops too low, the rate of baroreceptor firing decreases.
  • Describe the role of baroreceptors and cardiovascular centers (ANS) in blood pressure control

• Role of the Cardiovascular Center

  • Baroreceptors that detect stretch can also signal to the cardiovascular center to alter heart rate.

• Carotid Sinus Syncope and Massage

  • The carotid sinus contains numerous baroreceptors that are involved in homeostatic mechanisms for maintaining blood pressure.

• Homeostatic Responses to Shock

  • As a result, the baroreceptors in the arteries detect the hypotension and initiate the release of epinephrine and norepinephrine to increase heart rate and blood pressure.

• Congestive Heart Failure

  • This destimulates baroreceptors in the carotid sinus and aortic arch which links to the nucleus tractus solitarius.

• Homeostatic Control

  • Blood vessels have sensors called baroreceptors that detect if blood pressure is too high or too low and send a signal to the hypothalamus.

• Medulla Oblongata

• Great Vessels of the Heart

  • The aortic arch contains peripheral baroreceptors (pressure sensors) and chemoreceptors (chemical sensors) that relay information concerning blood pressure, blood pH, and carbon dioxide levels to the medulla oblongata of the brain.

• Venous Blood Pressure

  • Fainting can occur, but usually baroreceptors within the aortic sinuses initiate a baroreflex, triggering angiotensin II and norepinephrine release and consequent vasoconstriction and heart rate increases to augment blood flow return.