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من سلك طريقًا يلتمس فيه علمًا سهّل الله له ØšÙ‡ طريقًا إلى الجنة 𝑭𝒓𝒐𝒎 𝒔𝒕𝒖𝒅𝒆𝒏𝒕 →𝒇𝒖𝒕𝒖𝒓𝒆 𝒅𝒐𝒄𝒕𝒐𝒓. 𝑺𝒕𝒖𝒅𝒚 • 𝑰𝒏𝒔𝒑𝒊𝒓𝒆 •𝑮𝒓𝒐𝒘 • 𝑎𝒆𝒅𝒊𝒄𝒊𝒏𝒆🩺✚

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​{وَأَن لَّيْسَ لِلْإِنسَانِ إِلَّا مَا سَعَىٰ * وَأَنَّ سَعْيَهُ سَوْفَ يُرَىٰ * ثُمَّ يُجْزَاهُ الْجَزَاءَ الْأَوْفَىٰ}.

عندكم هذي ​؎وي اس؊لة مرات تجي في Blood vessels
Q1: What are the three layers of a blood vessel wall?
Q2: What is the function of the fenestrations in the internal elastic lamina?
Q3: Why do large blood vessels need Vasa Vasorum?
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Q4: What is the main component of the Tunica Media in large arteries vs. medium arteries?
Q5: What is the main structural difference between post-capillary venules and muscular venules?
Q6: State three differences between a medium-sized artery and a medium-sized vein under the microscope.

وتعرفيه وعندك
Cell of epidermis:
• Keratinocytes • Melanocytes • Langerhans cells • Merkel cells

وهذا حل الاس؊لة زي ما طلؚتوا مني... 🍁
1. Types of Capillaries
🟢 Continuous 🔞Endothelium: continuous 🔞Basement membrane: continuous 🔞Low permeability 🔞Site: muscle, skin, CNS (BBB) 🟡 Fenestrated 🔞Has pores (fenestrae) 🔞↑ permeability 🔞Some with diaphragm 🔞Site: kidney, endocrine glands, intestine 🔎 Sinusoidal (Discontinuous) 🔞Wide irregular lumen 🔞Large gaps + incomplete BM 🔞Highest permeability 🔞Site: liver, spleen, bone marrow
2. Pericyte Function
🔞Support capillaries 🔞Contract → regulate blood flow 🔞Help angiogenesis (new vessels) 🔞Stem cell-like → repair & regeneration 🔞Maintain vessel stability
3. LM vs EM
✧L/M (Light Microscope): 🔞Shows the general structure of the vessel wall 🔞Identifies the three layers: Tunica intima, Tunica media, Tunica adventitia 🔞Shows basic tissue organization ✧ E/M (Electron Microscope): 🔞Shows ultra-structural details 🔞Cell junctions between endothelial cells 🔞Endothelial fenestrae (pores) 🔞Basement membrane details 🔞Pericyte structure and fine features
4. Skeletal vs Cardiac Muscle
🟊 Skeletal 🔹Voluntary 🔹Long cylindrical fibers 🔹Many nuclei (peripheral) 🔹No intercalated discs 🔹Fatigues 🟥 Cardiac 🔹Involuntary 🔹Branched cells 🔹1–2 central nuclei 🔹Intercalated discs present 🔹Continuous rhythmic contraction
⭐ مراجعه ع السريع
✧Capillaries = (Closed → Open → Very Open) ✧ Continuous → Fenestrated → Sinusoidal ✧Muscle: ° Skeletal = “Power” ° Cardiac = “Forever beating”

‏- كَؚِّرُوا ليؚلغ تكؚِيركُم عِنّانَ السّماء
-اللَّهُ أَكَؚْرُ كَؚِيرا وَالْحَمْدُ لِلَّه كَثِيرًا وَسُؚْحَانَ اللَّهِ ُؚكْرَةً وَأَصِيلًا
-لََؚّيْكَ اللَّهُمَّ لََؚّيْكَ لََؚّيْكَ لاَ ؎َرِيكَ لَكَ لََؚّيْكَ إِنَّ الْحَمْدَ، وَالنِّعْمَةَ لَكَ وَالْمُلْكَ، لاَ ؎َرِيكَ لَكَ..🀍

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قيامكم اثاؚكم الله 🌞