Blood Vessels
Chapter 20
Overview
• Blood vessels form a closed delivery
system that begins and ends at the heart.
• Three major types of blood ves...
Overview
• As the heart contracts, it forces blood into
the large arteries leaving its ventricles.
• The blood moves into ...
Overview
• Blood draining from the capillaries flows
into venules, and then on into small veins
that merge to form larger ...
Arteries
• Arteries are vessels that transport blood
away from the heart.
• In terms of relative size and function,
arteri...
• Elastic Arteries
– Elastic arteries are the thick-walled arteries
near the heart – the aorta and its major
branches.
• M...
Capillaries
• Capillaries are the smallest blood vessels.
• Their role is exchange of materials
between the blood and inte...
Veins
• Blood is carried from the capillary beds
toward the heart by veins.
• Venules are formed when capillaries unite
an...
Chapter 20
Chapter 20
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Chapter 20

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Chapter 20

  1. 1. Blood Vessels Chapter 20
  2. 2. Overview • Blood vessels form a closed delivery system that begins and ends at the heart. • Three major types of blood vessels are: – Arteries – Veins – Capillaries
  3. 3. Overview • As the heart contracts, it forces blood into the large arteries leaving its ventricles. • The blood moves into successively smaller arteries, finally reaching their smallest branches, the arterioles, which feed into the capillary beds of body organs and tissues.
  4. 4. Overview • Blood draining from the capillaries flows into venules, and then on into small veins that merge to form larger veins that ultimately empty into the heart. • Altogether, the blood vessels in the adult human carry blood on a journey that stretches from about 60,000 miles through the internal body landscape!
  5. 5. Arteries • Arteries are vessels that transport blood away from the heart. • In terms of relative size and function, arteries can be divided into 3 groups: – Elastic arteries – Muscular arteries – Arterioles
  6. 6. • Elastic Arteries – Elastic arteries are the thick-walled arteries near the heart – the aorta and its major branches. • Muscular Arteries – The muscular arteries deliver blood to specific body organs and account for most of the named arteries studied in anatomy. • Arterioles – The arterioles are the smallest arteries.
  7. 7. Capillaries • Capillaries are the smallest blood vessels. • Their role is exchange of materials between the blood and interstitial fluid.
  8. 8. Veins • Blood is carried from the capillary beds toward the heart by veins. • Venules are formed when capillaries unite and veins are formed when venules unite. • Veins accommodate a fairly large blood volumes – up to 65% of the total blood supply.

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