blood vessels

• Arteries have thicker walls than veins to withstand higher pressure from the heart.
• The tunica media is the middle layer, composed of smooth muscle cells.
• Arteries have thicker walls than veins to withstand higher pressure from the heart.
• Veins are thinner-walled than arteries due to lower pressure.
• Veins are thinner-walled, less muscular, and contain valves that prevent backflow of blood.
• Capillaries are the smallest blood vessels that connect arterioles to venules.
• Capillaries are tiny blood vessels where exchange between tissues and blood occurs.
• Capillaries are tiny blood vessels that connect arterioles to venules.
• Veins are thinner-walled than arteries due to lower pressure from the heart.
• Blood flows through capillary beds at low pressures.
• Capillaries are tiny blood vessels where exchange between blood and tissues occurs.
• Capillaries are thin-walled and allow easy diffusion of substances across their walls.
• Capillaries are thin-walled structures made up of endothelial cells joined by tight junctions.
• Veins are thinner-walled than arteries due to lower pressure from the heart.
• Blood flow is regulated by vasoconstriction (narrowing) or vasodilation (widening).
• Endothelium is a single layer of flat epithelium lining the interior surface of blood vessels.
• Blood flow through capillaries is slow and allows for diffusion of oxygen, nutrients, hormones, and waste products.
• Veins are thinner-walled than arteries due to lower pressure from the heart.
• Capillaries allow for exchange between tissues and blood.
• Endothelium is a single layer of flat epithelium lining the interior surface of blood vessels.
• Capillary beds can be dilated or constricted by local factors such as temperature, pH, and chemicals released by nearby cells.
• The circulatory system is responsible for transporting oxygen, nutrients, hormones, and waste products throughout the body.
• Arteries have thicker walls with elastic fibers to handle high pressure from the heart.
• The walls of veins have thin layers of smooth muscle and elastic tissue.
• Blood carries oxygen, nutrients, hormones, and waste products throughout the body.
• Valves in veins prevent backward flow of blood.
• The circulatory system is responsible for transporting oxygenated blood throughout the body.
• The walls of veins have thin layers of smooth muscle, elastic tissue, and collagen fibers.
• Arteries carry oxygenated blood away from the heart while veins carry deoxygenated blood towards the heart.
• The basement membrane is located outside the endothelium, providing structural support.
• Arteries carry oxygenated blood away from the heart while veins return deoxygenated blood back to the heart.
• The endothelium is a single layer of cells lining the inside of all blood vessels, including capillaries.
• Blood vessels include capillaries, veins, and arteries.
• The lymphatic system is responsible for returning excess fluid back into circulation, protecting against infection, and absorbing fats from the small intestine.
• The wall of an artery is thicker compared to a vein because it has to withstand higher pressure.
• Pericytes surround the outer surface of capillaries and regulate blood flow.
• The diameter of veins can be controlled by smooth muscle fibers within their walls, which contract or relax depending on signals received.
• Arterioles have thicker muscular layers compared to venules.
• Venous blood has low oxygen content and carries waste products back to the lungs or digestive system.
• Lymph nodes contain white blood cells that fight off bacteria and viruses.