The circulatory system

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The circulatory system Heart Blood
vessels arteries veins
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Arteries carry blood away from heart Veins carry
it back Notice that walls of arteries and veins
are different
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How the heart contracts cells within the heart
transmit electrical signals Heart will beat even
if nerves are severed! Nervous system adjusts
heart rate Systole- contraction of
chambers Diastole- relaxation of chambers
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Conduction system of the heart
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The cardiac cycle
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How does blood actually get delivered through
the body? Blood pressure- pressure exerted by
blood against vessel walls Highest in aorta-
then drops continually systolic pressure- in
aorta diastolic pressure- when heart is relaxed
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Factors that affect blood pressure control by
brain raise or lower heart rate control
smooth muscle contraction vasodilation-
lowers vasoconstriction- raises hormones Can
see both events in different parts of the
body vasodilation in muscles, vasoconstriction i
n digestive tract
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Drugs like nicotine acts as vasoconstrictors Card
iovascular disease hypertension atherosclerosis
heart attack stroke Risk factors heredity di
et lifestyle obesity high blood LDL
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High blood pressure systolic 140 or
more diastolic 95 or more
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Arrhythmias- irregular heart rhythms some are
temporary and normal Athletes
bradycardia Tachycardia- response to exercise or
stress some drugs can cause tachycardia Measured
by ECG
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