30.4 blood vessels and transport key concept the circulatory system transports materials throughout...
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30.4 Blood Vessels and Transport
KEY CONCEPT The circulatory system transports materials throughout the body.
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30.4 Blood Vessels and Transport
Arteries, veins, and capillaries transport blood to all parts of the body.
• Arteries carry blood away from the heart.– blood under great pressure– thicker, more muscular walls
ARTERYVEIN
CAPILLARIES
arteriole venule
endothelium
connective tissue
smooth musclevalve
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30.4 Blood Vessels and Transport
• Veins carry blood back to the heart.
– blood under less pressure– thinner walls, larger diameter– valves prevent backflow
ARTERYVEIN
CAPILLARIES
arteriole venule
endothelium
connective tissue
smooth musclevalve
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30.4 Blood Vessels and Transport
• Capillaries move blood between veins, arteries, and cells.
ARTERYVEIN
CAPILLARIES
arteriole
endothelium
connective tissue
smooth muscle
venule
valve
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30.4 Blood Vessels and Transport
• Blood pressure is a measure of the force of blood pushing against artery walls. – systolic pressure:
left ventricle contracts
– diastolic pressure: left ventricle relaxes
• High blood pressure can precede a heart attack or stroke.
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30.4 Blood Vessels and Transport
Lifestyle plays a key role in circulatory diseases.
• Some choices lead to an increased risk of circulatory diseases.– smoking– long-term stress– excessive weight– lack of exercise – diet low in fruits
and vegetables,high in saturatedfats
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30.4 Blood Vessels and Transport
• Circulatory diseases affect mainly the heart and the arteries.– artery walls become thick and inflexible– plaque blocks blood flow in arteries