1.2 the circulatory system (blood pressure)
DESCRIPTION
Biology Form 5Chapter 1 : Transport1.2 The Circulatory System - Regulation of Blood PressureTRANSCRIPT
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1.2 The Circulatory System
The Regulatory Mechanism of Blood Pressure
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Postural Hypotension
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Blood pressure
force that the blood exerts on the wall of blood vessels
Measured in mm Hg
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Accurate Measurement
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Results
Category Systolic, mmHg Diastolic, mmHg Number of students
<90 <60
90 - 120 60 – 79
121 - 139 or 80 – 89
140 – 159 Or 90 - 99
160 - 179 Or 100 - 119
>180 Or > 120
Hypotension
Desirable
Prehypertension
Stage 1 Hypertension
Stage 2 Hypertension
Hypertensive Crisis
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White Coat Syndrome
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Regulation of Blood Pressure
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BLOOD PRESSURE IS REGULATED BY:
Nervous system Kidney
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Kidney
regulate blood pressure by controlling the amount of fluid in our blood
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Kidney
If blood Pressure high :
kidneys remove water from the blood
less volume to pump lower the blood pressure
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Nervous System
send impulses to speed up or to slow down the heart rate
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Baroreceptors -group of nerve fibres within the walls of the carotid arteries & aorta
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Regulation of High Blood Pressure
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Tr.Rez@SB2014
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Baroreceptors detect → send impulses to
cardiovascular centre medulla oblongata
Cardiovascular centre send impulses to heart & arterioles
Heart : REDUCE heart rate , LOWER cardiac
output
Arterioles : Vasodilation – reduce
resistance of blood flow
Reduced heart rate, lowered cardiac
output, vasodilation - ↓ BP
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Regulation of low blood pressure
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Baroreceptors detect → send impulses to
cardiovascular centre medulla oblongata
Cardiovascular centre send impulses to heart & arterioles
Heart : INCREASE heart rate , HIGHER
cardiac output
Arterioles : vasoconstriction –
INCREASE resistance of blood flow
Increased heart rate, higher cardiac output, vasocontriction - ↓ BP
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LESSON SUMMARY
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EXERCISE