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What vessels contain elastic fibers in the walls that are stretched during systole?
Capillaries
Compare the strength of arterial walls and capillary walls?
arterial walls has smooth muscle and elastic fibers (strong and flexible) and capillaries are made up of a single layer of endothelial cells (thin).
Where Elastic fibers are absent in case of blood vascular system?
The capillaries are the only blood vessels without elastic tissue. This is so that the vessel walls are as thin as possible to reduce the diffusion distance (for gases and waste products). Veins do contain a layer of elastic tissue is their walls, but this is a very thin layer (when compared to arteries).
Why is it important that the arteries have elastic walls?
The elastic walls helps regulate blood pressure.
Where are the walls of capillaries formed?
noin
What functions do capillaries and postcapillary venules share?
Small postcapillary venules consist entirely of endothelium just like capillaries (the larger venules have smooth muscle and thin externa as well). Also both capillaries and venules have no elastic tissues. Postcapillary venules are extremely porous which makes them more like capillaries then veins, and fluid and WBC's move easily into the bloodstream through these walls.
Why do capillaries have such thin walls?
Capillaries have thin walls to optimise the level of diffusion of oxygen and other nutrients in the blood stream to the surrounding cells.
What tissue is the walls of the alveoli composed of?
the walls of the alveoli are very thin but strong layers of elastic tissue lines with a single layer of flattened epithelium.
Which blood vessel is permeable?
Only capillaries have permeable walls; veins and arteries are not permeable.
Why do artery walls need to be elastic?
because
What happens when oxygen and carbon dioxide are exchanged in the lungs?
The exchange of oxygen and carbon dioxide happens in between the alveoli and then through the walls of the capillaries and then into the blood. The oxygen is then picked up by hemoglobin in the red blood cells and sent to all body cells. While this is happening the carbon dioxide is transported back from the body cells and into the blood. It diffuses through the walls of the capillaries and into the walls of the alveoli. Carbon dioxide leaves your body whenever you breathe out.
Do Capillaries have a muscular wall?
do cappilaries have muscular walls
