@li55s: الْغَايَةُ لَا تُبَرِّرُ الْحَيْوَنَة - #لونَــٰار #viral #fyp

لونَــٰار

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Wednesday 14 October 2026 12:05:35 GMT

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B♥︎👸 :

مبدع كالعادة✨

2026-10-14 12:13:42

9

𝆹ׁ𝅥ׅ𐔌𝒘𝒉𝒊𝒔𝒕𝒐𝒓𝒊𝒂 ⃙𝇋🍓 :

آدآمـ آللهہ هہ ذآ آلآبدآ؏

2026-10-14 17:16:52

2

F :

الإنسان لا تحركه غاياته كالحيوانات بل هو من يتحكم فيها وفي طريقة الوصول لها

2026-10-14 12:48:05

2

‧₊˚🖇️✩ 𝕬𝖍𝖑𝖆𝖒˚🎧⊹♡ :

ابدعت

2026-10-14 12:08:07

1

إسلام اليُسر :

حبيييت

2026-10-14 17:43:05

0

Maria Bushkar Bdarny :

كيف دنزلها

2026-10-14 12:24:45

0

meroua :

2026-10-14 20:02:49

0

☆ :

2026-10-14 20:47:37

0

زوجة أبوك للتربية والتعليم :

اهاهاهاهاها تحفةةةةةة و رب الكعبة

2026-10-14 21:35:37

0

حموز :

برضو الغاية تبرر الوسيلة ☺️🤝

2026-10-14 21:52:38

1

meryem_benaicha :

💯

2026-10-14 15:37:05

1

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BLOOD VESSELS Class 9 Biology Notes Blood vessels are tube-like structures that form a network throughout the body. They transport blood between the heart and different tissues and organs. There are three main types of blood vessels: arteries, veins, and capillaries. 1. Arteries Arteries are blood vessels that carry blood away from the heart. They have thick, strong, muscular and elastic walls because blood flows through them under relatively high pressure. Most arteries carry oxygen-rich blood. However, the pulmonary artery is an important exception because it carries oxygen-poor blood from the heart to the lungs. Structure of Arteries Thick and elastic walls Strong muscular middle layer Relatively narrow lumen Usually no valves Lined by a smooth inner layer called the endothelium Functions of Arteries Carry blood away from the heart Transport oxygen and nutrients to body tissues Help maintain blood pressure and continuous blood flow 2. Veins Veins are blood vessels that carry blood towards the heart. Their walls are thinner and less muscular than those of arteries because blood flows through veins at lower pressure. Most veins carry oxygen-poor blood. The pulmonary veins are an important exception because they carry oxygen-rich blood from the lungs to the heart. Structure of Veins Thinner walls than arteries Less muscle and elastic tissue Wider lumen Many veins contain valves Valves help prevent the backward flow of blood Functions of Veins Return blood to the heart Help prevent backflow through valves Complete the circulation of blood through the body 3. Capillaries Capillaries are the smallest and thinnest blood vessels in the body. They connect tiny arteries called arterioles with tiny veins called venules. Their walls are usually only one cell thick, allowing substances to move easily between the blood and surrounding tissues. Importance of Capillaries Capillaries are the main sites of exchange between blood and body tissues. They allow: Oxygen to move from blood into tissues Carbon dioxide to move from tissues into blood Nutrients to reach body cells Waste products to enter the blood Heat to be exchanged between blood and tissues Structure of Blood Vessels The three types of blood vessels are adapted for different functions. Arteries: Thick walls → high pressure → carry blood away from the heart. Veins: Thinner walls + valves → low pressure → return blood towards the heart. Capillaries: One-cell-thick walls → easy exchange → connect arteries and veins. Arteries vs Veins Feature Arteries Veins Direction Away from heart Towards heart Wall Thick and elastic Thin and less elastic Lumen Relatively narrow Relatively wide Pressure High Low Valves Usually absent Usually present Main role Carry blood away Return blood to heart Importance of Blood Vessels Blood vessels are essential for maintaining life because they provide a continuous pathway for blood circulation. They help deliver oxygen and nutrients to cells and carry carbon dioxide and other waste products away from tissues. Together, arteries, capillaries and veins form an interconnected transport system that allows blood to circulate throughout the body. Easy Revision Arteries → Away from the heart Veins → Towards the heart Capillaries → Exchange of substances Key Point Blood vessels work together to keep blood moving throughout the body and to maintain the exchange of gases, nutrients and wastes between the blood and tissues. #biologytok #follower #biology #unfreezemyaccount🙏🙏🙏 #studentlife

BLOOD VESSELS Class 9 Biology Notes Blood vessels are tube-like structures that form a network throughout the body. They transport blood between the heart and different tissues and organs. There are three main types of blood vessels: arteries, veins, and capillaries. 1. Arteries Arteries are blood vessels that carry blood away from the heart. They have thick, strong, muscular and elastic walls because blood flows through them under relatively high pressure. Most arteries carry oxygen-rich blood. However, the pulmonary artery is an important exception because it carries oxygen-poor blood from the heart to the lungs. Structure of Arteries Thick and elastic walls Strong muscular middle layer Relatively narrow lumen Usually no valves Lined by a smooth inner layer called the endothelium Functions of Arteries Carry blood away from the heart Transport oxygen and nutrients to body tissues Help maintain blood pressure and continuous blood flow 2. Veins Veins are blood vessels that carry blood towards the heart. Their walls are thinner and less muscular than those of arteries because blood flows through veins at lower pressure. Most veins carry oxygen-poor blood. The pulmonary veins are an important exception because they carry oxygen-rich blood from the lungs to the heart. Structure of Veins Thinner walls than arteries Less muscle and elastic tissue Wider lumen Many veins contain valves Valves help prevent the backward flow of blood Functions of Veins Return blood to the heart Help prevent backflow through valves Complete the circulation of blood through the body 3. Capillaries Capillaries are the smallest and thinnest blood vessels in the body. They connect tiny arteries called arterioles with tiny veins called venules. Their walls are usually only one cell thick, allowing substances to move easily between the blood and surrounding tissues. Importance of Capillaries Capillaries are the main sites of exchange between blood and body tissues. They allow: Oxygen to move from blood into tissues Carbon dioxide to move from tissues into blood Nutrients to reach body cells Waste products to enter the blood Heat to be exchanged between blood and tissues Structure of Blood Vessels The three types of blood vessels are adapted for different functions. Arteries: Thick walls → high pressure → carry blood away from the heart. Veins: Thinner walls + valves → low pressure → return blood towards the heart. Capillaries: One-cell-thick walls → easy exchange → connect arteries and veins. Arteries vs Veins Feature Arteries Veins Direction Away from heart Towards heart Wall Thick and elastic Thin and less elastic Lumen Relatively narrow Relatively wide Pressure High Low Valves Usually absent Usually present Main role Carry blood away Return blood to heart Importance of Blood Vessels Blood vessels are essential for maintaining life because they provide a continuous pathway for blood circulation. They help deliver oxygen and nutrients to cells and carry carbon dioxide and other waste products away from tissues. Together, arteries, capillaries and veins form an interconnected transport system that allows blood to circulate throughout the body. Easy Revision Arteries → Away from the heart Veins → Towards the heart Capillaries → Exchange of substances Key Point Blood vessels work together to keep blood moving throughout the body and to maintain the exchange of gases, nutrients and wastes between the blood and tissues. #biologytok #follower #biology #unfreezemyaccount🙏🙏🙏 #studentlife

أغنية برمتن برمه ع الظلام كامله الترند الجديد #2027 #تصميم_فيديوهات🎶🎤🎬 #viral #fypシ゚ #tiktok

أغنية برمتن برمه ع الظلام كامله الترند الجديد #2027 #تصميم_فيديوهات🎶🎤🎬 #viral #fypシ゚ #tiktok

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