RAPID CONTROL OF ARTERIAL PRESSURE 1 NERVOUS SYSTEM

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RAPID CONTROL OF ARTERIAL PRESSURE 1. NERVOUS SYSTEM 2. BARORECEPTORS(BUFFER SYSTEM 3. CHEMORECEPTORS 4.

RAPID CONTROL OF ARTERIAL PRESSURE 1. NERVOUS SYSTEM 2. BARORECEPTORS(BUFFER SYSTEM 3. CHEMORECEPTORS 4. ATRIAL AND PULMONARY ARTERY REFLEXES (BAINBRIGE REFLEX) 5. CNS ISCHEMIC RESPONSE

VASOMOTOR CENTER 1 -Vasoconstrictor area upper medulla 2 -Vasodilator area lower medulla they inhibit

VASOMOTOR CENTER 1 -Vasoconstrictor area upper medulla 2 -Vasodilator area lower medulla they inhibit vasoconstrictor activity 3 - Sensory area posteriolateral portions of medulla 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 •

4 -Regulation of heart rate through sympathetic and parasympathetic nerves. HR and strength of

4 -Regulation of heart rate through sympathetic and parasympathetic nerves. HR and strength of contraction increase when vasoconstrictor occurs. 5 - Continuous partial constriction of the blood vessels called sympathetic vasoconstrictor tone

Control of vasomotor center Many parts of the brain can excite or inhibit the

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

BARORECEPTORS

REGULATION OF BP Baroreceptors Afferent nerves Medulla oblongata center Sympathetic efferents SA node, ventricles,

REGULATION OF BP Baroreceptors Afferent nerves Medulla oblongata center Sympathetic efferents SA node, ventricles, Arteriolar smooth muscle Venous smooth muscle

REGULATION OF BP

REGULATION OF BP

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

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

Response of baroreceptors 1 - No response between 0 -60 mm. Hg 2 -Respond

Response of baroreceptors 1 - No response between 0 -60 mm. Hg 2 -Respond to rapidly changes than to stationary pressure 3 - Changes during changes in body posture 4 -Pressure buffer system 5 -Resetting in long term regulation of BP

Chemoreceptors 1 - Stimulated at low pressure about 80 mm Hg because decrease blood

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

Atrial reflex 1 -Strech or volume reflex which decrease • ADH through hypothalamus 2

Atrial reflex 1 -Strech or volume reflex which decrease • ADH through hypothalamus 2 -Baibrige reflex : Stretch receptors • 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 1 - Cerebral ischemia 2 - Emergency pressure control system 3

CNS Ischemic response 1 - Cerebral ischemia 2 - Emergency pressure control system 3 - Become significant at low pressure at 1520 mm Hg

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

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

THE RENIN- ANGIOTENSIN SYSTEM

THE RENIN- ANGIOTENSIN SYSTEM

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