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Level 18

The Heart


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cardiovascular system
this consists of the heart, blood and blood vessels
cardiovascular functions
they are tow remove waste products like carbon dioxide and supply oxygen and nutrients to the body
blood vessels
these include: veins, arteries and capillaries
Heart Rate
this is measured in beats per minutes (bpm)
stroke volume
the amount of blood pumped out by the heart per beat
cardiac output
the amount of blood pumped out by the heart per minute. It is worked out by stroke volume x heart rate
blood pressure
the force exerted by circulating blood on the walls of the blood vessels
systolic pressure
this is the highest reading and it occurs when the heart contracts (beat)
diastolic pressure
this is the lowest reading and it occurs when the heart relaxes
cholesterol
this is a fatty substance carried by the blood by lipoproteins
HDL
this is high density lipoprotien and is known as the good cholesterol as it carries cholesterol away and it is found in foods such as food and vegetables
LDL
this is low density lipoprotein and is known as the bad cholesterol as it builds up in the arteries. It is found in fatty foods