Flow of Blood Through Blood Vessels

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Flow of Blood Through Blood Vessels
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Blood Vessels
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Flow of Blood Through Blood Vessels
Arteries Arterioles Capillaries Venules Veins
Figure 19.1a
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Blood Flow
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Flow of Blood Through Blood Vessels
Figure 19.1a
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Arteries

• Function Carry blood away from the heart

Figure 19.2b
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Arterioles

• Function Deliver blood to capillaries

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Capillaries

• Function
• In the lungs oxygen enters blood, carbon
  dioxide leaves
• In the small intestines receive digested
  nutrients
• In endocrine glands pick up hormones
• In the kidneys removal of nitrogenous wastes

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Capillaries Function
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Types of Capillaries
Continuous capillary
Sinusoid
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Capillaries Venules

• Function of Venules
• Collect and drain blood into veins

A arteriole B vein C nerve
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Veins

• Function Return blood from capillaries toward
  the heart

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Structure of Blood Vessels

• 3 layers (tunics)
• Tunica intima single layer of epithelial cells
• Tunica media sheets of smooth muscle
• Tunica externa connective tissue
• Lumen central blood-filled space of a vessel

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Differences in Structure Between Arteries and
Veins

• Artery walls are thicker
• Veins have valves
• Arteries and arterioles are elastic
• Veins have larger lumens

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Differences in Structure Between Arteries and
Veins
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Varicose Veins
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Structure of Capillaries

• Have a thin tunica intima (one layer of simple
  squamous epithelium.
• No tunica media or externa

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Pulmonary Circulation

• Pulmonary trunk leaves the right ventricle and
  divides into right and left pulmonary arteries
• Superior and inferior pulmonary veins carry
  oxygenated blood into the left atrium

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Systemic Circulation
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The Aorta
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Vena Cavas

• Superior vena cava returns blood from body
  regions superior to the diaphragm
• Inferior vena cava returns blood from body
  regions inferior to the diaphragm

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Hepatic Portal System
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Cerebral Arterial Circle (Circle of Willis)
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Blood Pressure
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Blood Pressure
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Pulse