Table of Contents
What are the structural features of veins?
Blood is transported in arteries , veins and capillaries ….Structure and function of blood vessels.
| Arteries | Veins |
|---|---|
| Carry blood under high pressure | Carry blood under low or negative pressure |
| Have thick muscular and elastic walls to pump and accommodate blood | Have thin walls – have less muscular tissue than arteries |
What is the description and function of veins?
Veins are a type of blood vessel that return deoxygenated blood from your organs back to your heart. These are different from your arteries, which deliver oxygenated blood from your heart to the rest of your body. Deoxygenated blood that flows into your veins is collected within tiny blood vessels called capillaries.
Which is a correct description of veins?
Vein: A blood vessel that carries blood that is low in oxygen content from the body back to the heart. The deoxygenated form of hemoglobin (deoxy-hemoglobin) in venous blood makes it appear dark. Veins are part of the afferent wing of the circulatory system, which returns blood to the heart.
How is the structure of a vein related to its function?
Structure and function of veins Veins have a thinner wall because they do not have to deal with constant changes in blood pressure with heart contractions, and the blood moves more slowly through them. They contain valves, which help to prevent blood flowing in the wrong direction.
How is the structure of an artery different from the structure of a vein?
Arteries have thick, elastic, muscular walls whereas veins have thin walls with few elastic fibres. Arteries need these properties to give them the strength and elasticity needed to cope with the high pressure surges of oxygenated blood coming from the heart.
How does the structure of a vein relate to its function?
Veins. Veins carry blood toward the heart. This makes the walls of veins thinner than those of arteries, which is related to the fact that blood in the veins has less pressure than in the arteries. Because the walls of the veins are thinner and less rigid than arteries, veins can hold more blood.
What is capillary structure?
Capillaries are very thin, approximately 5 micrometers in diameter, and are composed of only two layers of cells—an inner layer of endothelial cells and an outer layer of epithelial cells. They are so small that red blood cells need to flow through them single file.
What is a vein easy definition?
Definition of vein (Entry 1 of 2) 1 : blood vessel especially : any of the tubular branching vessels that carry blood from the capillaries toward the heart. 2a : any of the vascular bundles forming the framework of a leaf.
What is the structure of an artery?
Each artery is a muscular tube lined by smooth tissue and has three layers: The intima, the inner layer lined by a smooth tissue called endothelium. The media, a layer of muscle that lets arteries handle the high pressures from the heart. The adventitia, connective tissue anchoring arteries to nearby tissues.
What valves are in veins?
One-Way Valves in the Veins One-way valves consist of two flaps (cusps or leaflets) with edges that meet. These valves help veins return blood to the heart. As blood moves toward the heart, it pushes the cusps open like a pair of one-way swinging doors (shown on the left).
Why are veins structured the way they are?
Veins are made up of thin layers with a few circular elastic fibres and muscle fibres. This is because blood does not flow in pulses and so the vein walls cannot help pump the blood on. Veins also have thin walls which allows the near by muscles to press against them so that they become flat.