Rapid Control of Arterial Pressure

Rapid Control of Arterial Pressure

RAPID CONTROL OF ARTERIAL PRESSURE NERVOUS SYSTEM.1 BARORECEPTORS(BUFFER SYSTEM.2

CHEMORECEPTORS.3 ATRIAL AND PULMONARY ARTERY.4 REFLEXES )BAINBRIGE REFLEX(

CNS ISCHEMIC RESPONSE.5 VASOMOTOR CENTER Vasoconstrictor area upper medulla-1

Vasodilator area lower medulla they inhibit-2 vasoconstrictor activity Sensory area posteriolateral portions of medulla - 3 and lower pons , receive signal from circulation

through vagus and glossopharyngeal and it control activity of both vasoconstrictor and vasodilator areas Of the vasomotor center

Regulation of heart rate through-4 sympathetic and parasympathetic

nerves.HR and strength of contraction .increase when vasoconstrictor occurs Continuous partial constriction of the- 5 blood vessels called sympathetic

vasoconstrictor tone Control of vasomotor center

Many parts of the brain can excite or inhibit the vasomotor center : Pons, mesencephalon, diencephalon, hypothalamus, parts of cerebral cortex

BARORECEPTORS REGULATION OF BP

Baroreceptors Afferent nerves Medulla oblongata center

Sympathetic efferents SA node, ventricles, Arteriolar smooth muscle Venous smooth muscle

REGULATION OF BP LONG TERM REGULATION OF

ARTERIAL PRESSURE RENAL BODY FLUID SYSTEM.1 Response of baroreceptors

No response between 0-60 mmHg- 1 Respond to rapidly changes than to-2 stationary pressure Changes during changes in body posture- 3

Pressure buffer system-4 Resetting in long term regulation of BP-5 Chemoreceptors

Stimulated at low pressure about 80mm- 1 Hg because decrease blood flow and so the oxygen with increase of CO2 and H They excite the vasomotor center to- 2

increase the BP Atrial reflex Strech or volume reflex which decrease-1

ADH through hypothalamus Baibrige reflex : Stretch receptors-2 transmit afferent signals through vagus nerve to the medulla and the efferent

through vagal and sympathetic to increase heart rate and strength of contraction CNS Ischemic response

Cerebral ischemia- 1 Emergency pressure control system- 2 Become significant at low pressure at 15-- 3 20mm Hg

LONG TERM REGULATION OF ARTERIAL PRESSURE RENAL BODY FLUID SYSTEM.1

THE RENIN- ANGIOTENSIN SYSTEM

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