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

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Presentation on theme: "Circulatory system. General outline Blood vascular system Heart Arteries Capillaries veins Lymphatic vascular system Lymphatic capillaries Lymphatic vessel."— Presentation transcript:

1 Circulatory system

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

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

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

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7 Continuous capillary

8 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

9 Fenestrated capillary

10 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

11 Sinusoid

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

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

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15 Medium-sized artery

16 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

17 Large artery

18 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

19 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

20 Heart  a muscular organ that contracts rhythmically  pump blood through the circulatory system

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

22 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

23 Purkinje cell Cardiac cell


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