Flashcards in Overview & Anatomy Deck (20):
Left side is ____ pressure and feeds ____ circulation
High pressure, feeds systemic circulation
Right side is ____ pressure and feeds ____ circulation
Lower pressure, pulmonary circulation
Function o the CV system is to _______
1. Maintain homeostasis!
2. Distribute dissolved gases & nutrients
3. Waste removal
4. Constant temperature
5. Constant pH
6. Constant isomolarity
Describe series vs parallel arrangement
Series = no direct connection between L & R heart, arranged in series
Parallel = Multiple pathways from heart to vasc bed
What is the importance of parallel arrangement?
1. Oxygenated blood visits one organ system before returning to heart
2. Changes in flow or demand in one organ does not directly affect other organs
3. Blood flow to different organs can be matched to demand
MAJOR EXCEPTION: hepatic circulation
3 layers of heart
1. Epicardium (outside membrane)
2. Myocardium (thick muscle)
3. Endocardium (inner membrane)
1&2. Ventricles - main pumping
3&4. Atria - small "primer" chambers
1. Tricuspid - RA and RV
2. Mitral - LA and LV
3. Pulmonic - RV and PA
4. Aortic - LV and aorta
Which valve only has 2 cusps?
1. SVC and IVC
Function of AV node
Introduces delay so that atrial contraction occurs before ventricular contraction
Implications of damage to conduction system
Electrical arrhythmia and inefficient pumping action
His-Purkinje system is made up of what?
Specialized myocyte cells, ready for fast conduction
Where do coronary arteries originate?
Root of aorta
LAD = widowmaker, why?
Because occlusions within LAD are often suddenly fatal.
Path of Deoxy blood flow
• Returns from systemic circulation via SVC and IVC
• Enters RA w/o valve
• RA contracts and ↑ pressure to open tricuspid valve
• Blood enters RV
• RV contract and opens pulmoic valve
• Blood enters PA
Path of Oxy blood flow
• Returns from lungs and enters LA via PV
• LA contracts and opens mitral valve
• Blood enters LV
• LV contracts and opens aortic valve
• Blood enters systemic circulation via aorta
Which are resistance vessels? Capacitance vessels?
Arterioles = resistance vessels
Venules = capacitance vessels
Varicose veins = failure of what?
Failure of one-way valves in venules.