Arteries + Veins Flashcards

1
Q

What are Arteries?

A

carry blood from heart to tissues

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2
Q

3 layers of the artery walls

A
  1. Tunica Adventitia (outer)
  2. Tunica Media (middle smooth muscular)
  3. Tunica Intima (inner)
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3
Q

3 types of arteries

A
  1. ELASTIC ( ex. abdominal aorta)
    - largest size
    - Allow for high degree of expansion
    - between heart beats
  2. MUSCULAR ( ex. femoral artery)
    - distributing arteries
    - regulate flow of blood to different parts of body
  3. ARTERIOLES ( ex. tributaries)
    - narrow lumina
    - thick muscular walls
    - blood pressure controlled by muscular tone
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4
Q

Smallest to Largest Arteries

A

Capillaries
arterioles
arteries

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5
Q

Smallest to Largest Veins

A

Capillaries
venules
veins

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6
Q

Veins

A

returns blood to heart

NOTE: Pulmonary veins –> carry blood from lungs to heart

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7
Q

Arteries VS Veins

A

ARTERIES:

  • thick walls
  • more elastic fibres in tunica media
  • sympathetic nervous system controls smooth muscle
  • smallest vessels (arterioles) surrounded by smooth muscle
  • no valves

VEINS:

  • thin walls
  • fewer elastic fibres
  • no significant sympathetic innervation
  • venules; no smooth muscles
  • large vessels have valves
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8
Q

3 Types of Veins

A
  1. LARGE (ex. inferior vena cava)
    - wide bundles of smooth muscle
    - well developed tunica adventitia
  2. MEDIUM (ex. great saphenous vein)
    - Valves : helps with direction of flow
    - muscolvenous pump
  3. SMALL (ex. venules)
    - come together to form venous plexuses
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9
Q

What gets exchanged through capillaries?

A

Oxygen
Nutrients
CO2
other materials

EXCHANGED THROUGH DIFFUSION

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