1 / 23

Circulatory system

Circulatory system. General outline. Heart Arteries Capillaries veins. Blood vascular system. Lymphatic capillaries Lymphatic vessel Lymphatic ducts. Lymphatic vascular system. Capillaries . A single layer of endothelial cells basement membrane A few connective tissue (pericytes).

lotus
Download Presentation

Circulatory system

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Circulatory system

  2. General outline Heart Arteries Capillaries veins Blood vascular system Lymphatic capillaries Lymphatic vessel Lymphatic ducts Lymphatic vascular system

  3. Capillaries A single layer of endothelial cells basement membrane A few connective tissue (pericytes) • LM Continuous capillary Fenestrated capillary Sinusoid • EM

  4. Capillaries Continuous C. Fenestrated C. Sinusoid

  5. Continuous capillary: • distributed in muscle tissue, brain, lung and connective tissue, etc. • endothelial cell: large number of pinocytotic vesicles, no pores, exist cell junctions between the endothelia • basement membrane: integrity

  6. Continuous capillary

  7. Fenestrated capillary: • distributed in the kidney glomerulus, mucosa of gastrointestine, some endocrine glands • endothelial cells: present abundant pores, have or haven’t diaphragm on them • basement membrane: continuous

  8. Fenestrated capillary

  9. Sinusoid: • distributed in liver, spleen, and some endocrine glands • a greatly enlarged diameter • endothelial cell: intercellular clefts are large between cells, many pores without diaphragm • absence of a continuous basement membrane

  10. Sinusoid

  11. Artery • transport blood from heart to capillaries • according to their size, structure and function Large artery Medium-sized artery Small artery arteriole are classified

  12. Medium-sized artery: • muscular artery Endothelium Subendothelial layer: LCT Internal elastic lamina: clear Tunica intima Tunica media: contain 10~40 layers of circular smooth muscle External elastic lamina LCT: contain vasa vasorum Tunica adventitia

  13. Medium-sized artery

  14. Large artery: • elastic artery • subendothelial layer is thicker with a few smooth muscles • tunica media is thick, contains a lot of circular elastic membrane • internal and external elastic lamina are not distinguished • tunica adventitia are thiner

  15. Large artery

  16. Small artery: • muscular artery and peripheral resistance vessel • internal elastic lamina is clear, while external elastic lamina is not distinguished • the media contains 3~9 layers of smooth muscles

  17. Vein • large lumen, thin wall, irregular • internal and external elastic lamina are not clear • tunica media is thin, with a few elastic fibers and smooth muscles • tunica adventitia is thick • some veins have valves

  18. Heart • a muscular organ that contracts rhythmically • pump blood through the circulatory system

  19. The wall of heart Endothelium Subendothelial layer Subendocardial layer • endocardium • myocardium: thickest layer, consists of cardiac muscle LCT: contain adipose tissue Methothelium • epicardium

  20. Impulse generating and conducting system of the heart: • Pacemaker cells: heartbeat generating • Purkinje cells (bundle cell): distributed in subendocardial layer, larger than cardiac muscle cells • Transitional cells: transmit impulse

  21. Purkinje cell Cardiac cell

More Related