1. Cardiovascular System: Circulation Pathways and Lymphatics
Comparative Anatomy
Tony Serino, Ph.D.
Biology Department
Misericordia Univ.

2. Blood Vessels Arteries –conduct blood away from heart
Elastic arteries, Muscular arteries, arterioles
Veins –conduct blood toward heart
Venules, small and large veins
Capillaries –thinnest blood vessel; used in exchange, is the functional unit of circulatory system (Microcirculation)
AV shunts, metarterioles, pre-capillary sphincters, and capillary bed

3. Blood Vessels Types

4. Arteries and Veins
Arteries are known as resistance vessels, especially the arterioles
Arteries withstand the greatest BP
Veins are capacitance vessels, they are able to change the diameter to hold more or less blood

5. Vessel Anatomy

6. Capillary Anatomy
Three types: tight, fenestrated and sinusoids

7. Capillary Bed (blood flowing)

8. Capillary Bed (blood shunted)

10. Atherosclerotic plaque

11. Venous Side

12. Skeletal Muscle Pump

13. Lymphatic Circulation
Drains tissue fluid (interstitial fluid)
Prevents edema
Filters the lymph
Returns clean lymph to circulation at junction of subclavian and jugular veins

14. Lymphatic System

15. Lymphatic Capillaries

16. Accumulation of Lymph

17. Lymphatic Vessels

18. Lymph Drainage

19. Thoracic Duct

20. Lymph Node –filters lymph

21. Lymph Node
Cortex
Germinal Center
Medulla

22. Thymus

23. Tonsils
Pharyngeal Tonsil (adenoids)

24. Spleen

25. Internal Spleen