Do Now What is blood pressure? How do we measure blood pressure? What is blood pressure? How do we...
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Transcript of Do Now What is blood pressure? How do we measure blood pressure? What is blood pressure? How do we...
Do NowDo Now
What is blood pressure?
How do we measure blood pressure?
What is blood pressure?
How do we measure blood pressure?
Blood PressureBlood Pressure
Blood Pressure is the pressure that blood exerts against the inner walls of the blood vessels
It is the force that keeps blood circulating between heartbeats
Blood pressure is measured in the large systemic arteries near the heart
Blood Pressure is the pressure that blood exerts against the inner walls of the blood vessels
It is the force that keeps blood circulating between heartbeats
Blood pressure is measured in the large systemic arteries near the heart
Effects of various Effects of various factors on blood factors on blood
pressurepressure
Effects of various Effects of various factors on blood factors on blood
pressurepressure
Factors that effect blood pressureFactors that effect blood pressure
There are several factors that effect blood pressure
The two biggest are cardiac output and peripheral resistance
Cardiac output is the amount of blood pumped out from the heart at any given time
Peripheral resistance is the amount of friction encountered by the blood as it flows through the various vessels of the cardiovascular system
There are several factors that effect blood pressure
The two biggest are cardiac output and peripheral resistance
Cardiac output is the amount of blood pumped out from the heart at any given time
Peripheral resistance is the amount of friction encountered by the blood as it flows through the various vessels of the cardiovascular system
Factors of peripheral resistanceFactors of peripheral resistance
There are many factors that can effect peripheral resistance
The most common are vasodilation, vasoconstriction, and atherosclerosis.
Increased blood volume or blood viscosity (thickness) will also change resistance
There are many factors that can effect peripheral resistance
The most common are vasodilation, vasoconstriction, and atherosclerosis.
Increased blood volume or blood viscosity (thickness) will also change resistance
Neural Factors:The autonomic Nervous systemNeural Factors:The autonomic Nervous system
The parasympathetic nervous system has little to no effect on blood pressure
It is the work of the sympathetic nervous system that causes vasoconstriction
The parasympathetic nervous system has little to no effect on blood pressure
It is the work of the sympathetic nervous system that causes vasoconstriction
Neural Factors:The autonomic Nervous systemNeural Factors:The autonomic Nervous system
Ex: When you stand up and blood pools in the legs and feet the sympathetic nervous system sends signals to pressoreceptors in the large arteries of the neck and chest
Ex: When you stand up and blood pools in the legs and feet the sympathetic nervous system sends signals to pressoreceptors in the large arteries of the neck and chest
Renal factors:KidneysRenal factors:Kidneys
Kidneys are responsible for conserving water and salt
The source of water for the body is mostly in the bloodstream
When pressure is high the body will produce more urine to lower the pressure and vice versa
Kidneys are responsible for conserving water and salt
The source of water for the body is mostly in the bloodstream
When pressure is high the body will produce more urine to lower the pressure and vice versa
Other factorsOther factors
There are a few other factors that also change blood pressure
These include temperature, diet, and chemicals (drugs)
There are a few other factors that also change blood pressure
These include temperature, diet, and chemicals (drugs)
TemperatureTemperature
In general cold weather will create a vasoconstriction effect.
This is why cold compresses are recommended to prevent swelling of a bruised area.
In general heat will have a vasodilation effect.
In general cold weather will create a vasoconstriction effect.
This is why cold compresses are recommended to prevent swelling of a bruised area.
In general heat will have a vasodilation effect.
DietDiet
Although medical opinion has debated this at large over recent years it is recommended that a diet low in salt, saturated fats, and cholesterol helps to prevent hypertension.
Hypertension is high blood pressure.
Although medical opinion has debated this at large over recent years it is recommended that a diet low in salt, saturated fats, and cholesterol helps to prevent hypertension.
Hypertension is high blood pressure.
Chemicals (Drugs)Chemicals (Drugs)
There are many effects that chemicals or drugs can have on blood pressure
Epinephrine will increase both heart rate and blood pressure
Nicotine will increase vasoconstriction.
Both alcohol and histamine cause vasodilation
There are many effects that chemicals or drugs can have on blood pressure
Epinephrine will increase both heart rate and blood pressure
Nicotine will increase vasoconstriction.
Both alcohol and histamine cause vasodilation