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The Human Cardiovascular System. * In preparation for a pig’s heart dissection. Cardiovascular/Circulatory System:. Principles Structures Two circuits Pulmonary Systemic Heart Details Other Details. CV System Function:. Circulate blood through entire body for

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the human cardiovascular system

The HumanCardiovascular System

*In preparation for a pig’s heart dissection

Larry M. Frolich, Ph.D.,Human Anatomy

cardiovascular circulatory system
Cardiovascular/Circulatory System:
  • Principles
  • Structures
  • Two circuits
    • Pulmonary
    • Systemic
  • Heart Details
  • Other Details
cv system function
CV System Function:
  • Circulate blood through entire body for
          • Transport of oxygen to cells
          • Transport of CO2 away from cells
          • Transport of nutrients (glucose) to cells
          • Movement of immune system components (cells, antibodies)
          • Transport of hormones
slide4
How?
  • Heart is pump
  • Diffusion in

capillaries

Veins = Return

Arteries = Away

slide5

Overall Organization

  • Heart/Great Vessels--1 Route
  • Smaller arteries & veins --many routes -collateral circulation
slide6

Walls of Arteries and Veins

  • Tunica externa
    • Outermost layer
    • Strengthens, Anchors
  • Tunica media
    • Middle layer
    • Vaso-constriction/dilation
  • Tunica intima
    • Innermost layer
    • Minimize friction
  • Lumen
capillaries
Capillaries
  • Microscopic: 1 cell thick
  • Network
  • Entire goal of C-V system is to get blood into capillaries where diffusion takes place
slide11

GREAT VESSELS

  • Aorta
  • IVC, SVC
  • Pulmonary Trunk
  • Pulmonary Veins
2 circulatory paths

heartarteries arterioles

 

veinsvenules capillaries

2 Circulatory Paths

Systemic

  • Pulmonary
slide15

Heart Chambers and Valves

Larry M. Frolich, Ph.D.,Human Anatomy

slide16

Right Heart Chambers: Pulmonary Circuit

  • Right Atrium (forms most of posterior of heart)
        • Receives O2-poor blood from body via IVC, SVC, Coronary sinus
  • Right Ventricle
        • Receives O2-poor blood from right atrium through tricuspid valve
        • Pumps blood to lungs via Pulmonary Semilunar Valve in pulmonary trunk
          • Septum
slide17

Left Heart Chambers: Systemic Circuit

  • Left Atrium
        • Receives O2-rich blood from 4 Pulmonary Veins
  • Left Ventricle (forms apex of heart)
          • Receives blood from Left Atrium via bicuspid valve
          • Pumps blood into aorta via Aortic Semilunar Valve to body
slide20

Heart Valves: Lub*-Dub**

  • *Tricuspid Valve: Right AV valve
    • 3 Cusps (flaps) made of endocardium and CT
    • Cusps anchored in Rt. Ventricle by Chordae Tendinae
    • Chordae Tendinae prevent inversion of cusps into atrium
    • Flow of blood pushes cusps open
    • When ventricle in diastole (relaxed), cusps hang limp in ventricle
    • Ventricular contraction increases pressure and forces cusps closed
  • *Bicuspid (Mitral) Valve: Left AV valve
    • 2 cusps anchored in Lft. Ventricle by chordae tendinae
    • Functions same as Rt. AV valve
  • **Semilunar valves: prevents backflow in large arteries
    • Pulmonary Semilunar Valve: Rt Ventricle and Pulmonary Trunk
    • Aortic Semilunar Valve: Left Ventricle and Aorta
    • 3 cusps: blood rushes past they’re flattened, as it settles they’re pushed down (valve closed)
slide22

Heart Wall

  • Epicardium (most superficial)
  • – Visceral pleura
  • Myocardium (middle layer)
      • Cardiac muscle
      • Contracts
  • Endocardium (inner)
      • Lines the heart
blood supply to heart wall
Blood supply to heart wall
  • Rt and Lft Coronary Arteries
    • Branch from Ascending Aorta
    • Have multiple branches along heart
    • Coronary Heart Disease
  • Cardiac Veins
    • Coronary Sinus (largest)
    • Many branches feed into sinus
slide24

http://www.rmgh.net/wiki/images/4/4b/Coronary_arteries_and_cardiac_veins.gifhttp://www.rmgh.net/wiki/images/4/4b/Coronary_arteries_and_cardiac_veins.gif