The Circulatory System

1
The Circulatory System

• Chapter 51

2
The Basics

• It carries your blood!
• (nutrients, gases, temperature, and hormones)
• Arteries, arterioles (from the heart)
• Cappilaries
• Veins, venules (to the heart)
• Lymphatic System

3
Structure of System

• Arteries elastic sheath, four basic layers
• Veins same layers, collapsible, larger
• Pressure
• Capillaries only endothelium, located throughout
  body, precapillary sphincter

4
Makeup of the Blood

• Plasma metabolites, salts/ions, and proteins
• Erythrocytes red blood cells
• Leukocytes granulocytes (neutrophils, basophils,
  eosinophils, monocyte?macrophages) To the
  pictures

• Platelets (clotting process)
• Want to visualize it?

5
Evolution of the Heart

• Peristaltic Pump
• One-cycle Chamber Pump (fish)
• Pulmonary Circulation (amphibians and reptiles)

6
Circulation (general)

• Generally, the blood moves after aerated by
  lungs flows through pulmonary veins to left
  atrium, bicuspid shuts, into left ventricle and
  to aorta and coronary arteries
• From veins (vena cava) into right atrium, then
  right ventricle, to pulmonary artery to lungs
• Confused???

7
Heart Contraction

• SA node- spontaneous depolarization with a
  regular rhythm
• Wave through cells of left and right atria

• AV node- slender tissue that connects
  atria to ventricles
• Ventricles contract almost .1 seconds after
  atria, allows atria to empty contents into
  ventricles before ventricles contract

One more time