CARDIO

Question 1

ANAT

Arteries vs Veins

• Types?
• O2 Conc (* 2 exceptions each *)?
• Direction of bl flow?
• Anatomy (3 factors)?
• Valves present?
• Vessel type?

Answer 1

Arteries:
- Systemic + Pulmonary art
- Carry OXYGENATED bl, except for:
     - Pulmonary art
     - Umbilical art
- Bl AWAY from Heart 
- Thick elastic muscular layer (can handle high pressures), rigid walls,
   deeper in body.
- NO valves
- Resistance vessels

Veins:

• Systemic + Pulmonary veins, Superficial + Deep veins
• Carry DEOXYGENATED bl, except for:
  
  • Pulmonary vein
  • Umbilical vein
• Bl TO Heart
• Thin elastic muscular layer, collapsible walls, closer to skin.
• Semilunar valves (prevent bl flow in opposite direction)
• Capacitance vessels

Question 2

ANAT

Coronary Dominance

Def’n / Determination of,
Origin of Post Desc Art (3 possibilities)?

Answer 2

Coronary Dominance is determined by the coronary art that supplies blood to the POST Descending Art (aka post interventricular art).

ORIGIN of Post Descending Art (PDA):

• R Dominant (70% of pop): PDA arises from RCA
• L Dominant (10% of pop): PDA arises from L Circumflex art
• Codominant (20% of pop): PDA arises from both RCA + L Circumflex art

AV Nodal art also originates from dominant coronary art.