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1. Types of Capillaries
ð¢ Continuous
ðžEndothelium: continuous
ðžBasement membrane: continuous
ðžLow permeability
ðžSite: muscle, skin, CNS (BBB)
ð¡ Fenestrated
ðžHas pores (fenestrae)
ðžâ permeability
ðžSome with diaphragm
ðžSite: kidney, endocrine glands, intestine
ðŽ Sinusoidal (Discontinuous)
ðžWide irregular lumen
ðžLarge gaps + incomplete BM
ðžHighest permeability
ðžSite: liver, spleen, bone marrow
2. Pericyte Function
ðžSupport capillaries
ðžContract â regulate blood flow
ðžHelp angiogenesis (new vessels)
ðžStem cell-like â repair & regeneration
ðžMaintain vessel stability
3. LM vs EM
â§L/M (Light Microscope):
ðžShows the general structure of the vessel wall
ðžIdentifies the three layers: Tunica intima, Tunica media, Tunica adventitia
ðžShows basic tissue organization
â§ E/M (Electron Microscope):
ðžShows ultra-structural details
ðžCell junctions between endothelial cells
ðžEndothelial fenestrae (pores)
ðžBasement membrane details
ðžPericyte structure and fine features
4. Skeletal vs Cardiac Muscle
ðŠ Skeletal
ð¹Voluntary
ð¹Long cylindrical fibers
ð¹Many nuclei (peripheral)
ð¹No intercalated discs
ð¹Fatigues
ð¥ Cardiac
ð¹Involuntary
ð¹Branched cells
ð¹1â2 central nuclei
ð¹Intercalated discs present
ð¹Continuous rhythmic contraction
â Ù
راجع٠ع Ø§ÙØ³Ø±Ùع
â§Capillaries = (Closed â Open â Very Open)
â§ Continuous â Fenestrated â Sinusoidal
â§Muscle:
° Skeletal = âPowerâ
° Cardiac = âForever beatingâÙØ°Ø§ ØªÙØ±Ùغ ÙÙ ØØ§Ø¶Ø±Ø© Ù Ù Ù ØØ§Ø¶Ø±Ø§Øª Ø§ÙØ¯ÙØªÙØ±Ø© ÙÙ CVS
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