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Flashcards in Overview & Anatomy Deck (20):
1

Left side is ____ pressure and feeds ____ circulation

High pressure, feeds systemic circulation

2

Right side is ____ pressure and feeds ____ circulation

Lower pressure, pulmonary circulation

3

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

4

Describe series vs parallel arrangement

Series = no direct connection between L & R heart, arranged in series

Parallel = Multiple pathways from heart to vasc bed

5

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

6

3 layers of heart

1. Epicardium (outside membrane)
2. Myocardium (thick muscle)
3. Endocardium (inner membrane)

7

4 chambers

1&2. Ventricles - main pumping
3&4. Atria - small "primer" chambers

8

4 valves

1. Tricuspid - RA and RV
2. Mitral - LA and LV
3. Pulmonic - RV and PA
4. Aortic - LV and aorta

9

Which valve only has 2 cusps?

Mitral

10

4 vessels

1. SVC and IVC
2. PA
3. PV
4. Aorta

11

Function of AV node

Introduces delay so that atrial contraction occurs before ventricular contraction

12

Implications of damage to conduction system

Electrical arrhythmia and inefficient pumping action

13

His-Purkinje system is made up of what?

Specialized myocyte cells, ready for fast conduction

14

Where do coronary arteries originate?

Root of aorta

15

LAD = widowmaker, why?

Because occlusions within LAD are often suddenly fatal.

16

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

17

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

18

Which are resistance vessels? Capacitance vessels?

Arterioles = resistance vessels
Venules = capacitance vessels

19

Varicose veins = failure of what?

Failure of one-way valves in venules.

20

Atherosclerotic plaques are initiated by damage to what structure?

vascular endothelium (found in tunica intima)