Arteries + Veins

Question 1

What are Arteries?

Answer 1

carry blood from heart to tissues

Question 2

3 layers of the artery walls

Answer 2

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

Question 3

3 types of arteries

Answer 3

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

Question 4

Smallest to Largest Arteries

Answer 4

Capillaries
arterioles
arteries

Question 5

Smallest to Largest Veins

Answer 5

Capillaries
venules
veins

Question 6

Veins

Answer 6

returns blood to heart

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

Question 7

Arteries VS Veins

Answer 7

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

Question 8

3 Types of Veins

Answer 8

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

Question 9

What gets exchanged through capillaries?

Answer 9

Oxygen
Nutrients
CO2
other materials

EXCHANGED THROUGH DIFFUSION