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Circulatory system

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External elastic lamina. LCT: contain vasa vasorum. Medium-sized artery. Large artery: ... internal and external elastic lamina are not clear ... – PowerPoint PPT presentation

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Title: Circulatory system


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

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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 havent 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

Endothelium Subendothelial layer LCT Internal
elastic lamina clear
Tunica intima
Tunica media contain 1040 layers of circular
smooth muscle
External elastic lamina LCT contain vasa vasorum
Tunica adventitia
14
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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 39 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
Endothelium Subendothelial layer Subendocardial
layer
  • endocardium
  • myocardium thickest layer, consists of

cardiac muscle
LCT contain adipose tissue Methothelium
  • epicardium

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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