Growth and Development of different organisms National 5 Biology Key Area 6: The Need for Transport (b) Animal Transport Systems National 4 Biology Key Area 4 Growth and Development of different organisms

By the end of this lesson you will be able to .... Name the 3 types of blood vessels. Describe the function of each blood vessel Describe and compare the structure of each type of vessel

arteries veins Blood vessels capillaries The blood vessels are tubes which carry blood around the body. They are: arteries capillaries veins

Types of Blood Vessels 1:09

The ARTERY Arteries carry blood away from the heart. The artery has a pulse thick muscle and elastic fibres the thick muscle can contract to push the blood along. Carries blood at high pressure.

Veins carry blood towards the heart. The VEIN Veins carry blood towards the heart. veins have valves which act to stop the blood from going in the wrong direction. thin muscle and elastic fibres body muscles surround the veins so that when they contract to move the body, they also squeeze the veins and push the blood along the vessel. Carries blood at low pressure

Capillaries form networks at organs and tissues The CAPILLARY Capillaries link Arteries with Veins they exchange materials between the blood and other body cells. Capillaries form networks at organs and tissues the wall of a capillary is only one cell thick The exchange of materials between the blood and the body can only occur through capillaries.

Arteries, veins and capillaries Arteries carry high pressure blood away from the heart. They have smaller lumen and no valves. Capillaries have thin walls (one cell thick) to allow glucose and oxygen to pass through. Also used to connect arteries to veins. Veins carry low pressure blood back to the heart. They have thinner, less elastic walls and have valves to prevent backflow of blood.

Arteries, Capillaries and Veins Arteries have a thick muscular wall, veins have a thin muscular wall and capillaries are only 1 cell thick (VERY thin) Veins are the only vessel to contains valves

Use these words to complete your note ….. thick one cell networks low narrow wider towards large high away valves

Arteries have_______, muscular walls, a _______ central channel and carry blood under _____ pressure ______ from the heart. Veins carry blood under ____ pressure, have thinner walls and a ______ channel. Veins contain _____to prevent the backflow of blood and carry blood ______ the heart. Capillaries form _______ at organs and tissues and have a wall only ___ _____ thick. They have a _____ surface area allowing exchange of materials.

Arteries have_______, muscular walls, a _______ central channel and carry blood under _____ pressure ______ from the heart. Veins carry blood under ____ pressure, have thinner walls and a ______ channel. Veins contain _____to prevent the backflow of blood and carry blood ______ the heart. Capillaries form _______ at organs and tissues and have a wall only ___ _____ thick. They have a _____ surface area allowing exchange of materials. thick narrow high away low wider valves towards networks one cell large

Task: Colour the 3 blood vessels to show the type of blood found in each one Deoxygenated blood Oxygenated blood Get pupils to label all the differences from the table onto this diagram