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ANAT-A 215 Exam 3 > Blood Vessels > Flashcards

Blood Vessels Flashcards

1
Q

Arteries Definiton

A

take blood AWAY from the heart TO other tissues

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2
Q

Arteries

A
  • transport blood high in oxygen (exception: pulmonary arteries)
  • they have a relatively thick, springy wall
  • blood pressure higher in arteries than in veins
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3
Q

Veins Definition

A

take blood back TO the heart

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4
Q

Veins

A
  • transport blood low in oxygen and highin carbon dioxide (exception: pulmonary veins)
  • compared to arteries, their walls are much thinner and collapsible
  • lumen generally much larger than arteries
  • blood pressure is lower in veins
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5
Q

Capillaries Definition

A

connecting arteries and veins are tiny vessels

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6
Q

Pathway of Blood

A

heart -> elastic arteries -> muscular arteries -> arterioles -> capillaries -> venules -> veins -> heart

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7
Q

Blood Vesscle Structure Components

A

Tunica Externa
Tunica Media
Tunica Intima

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8
Q

Tunica Externa

A

outermost layer

  • areolar connective tissue
  • largest layer in veins
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9
Q

Tunica Media

A

middle layer

  • circularly arranged smooth muscle fibers
  • largest layer in arteries
  • sympathetic innervation typically causes vasoconstriction
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10
Q

Tunica Intima

A

Innermost Layer

Endothelium (simple squamous epithelium) and areolar connective tissue

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11
Q

Arteries Components

A

Elastic Arteries
Muscular Arteries
Arterioles

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12
Q

Elastic Arteries

A

vessel wall contains large amounts of elastic protein fibers

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13
Q

Muscular Arteries

A

less elastic than elastic arteries, and

more smooth muscle in the tunica media

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14
Q

Arterioles

A

tunica media consists of 6 or fewer layers of smooth muscle

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15
Q

Capillaries

A

vessel diameter is only slightly larger than the diameter of an erythrocyte! *have JUST a Tunica Intima
*gas/nutrient exchange occurs here!!!

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16
Q

Venules

A

Collect blood from capillaries

17
Q

Veins

A

Formed when venules unite

  • Most (but not all) veins have valves (Help make sure blood will not go backwards)
  • Function: prevent backflow
  • Muscular Pumps also help blood be pushed in veins toward heart

ANAT-A 215 Exam 3 (16 decks)

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