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Why do capillaries permit the diffusion of materials whereas arteries and veins do not?
Wiki User
∙ 13y ago
why do capillaries permit the diffusion of materials, whereas arteries and veins do not?
Because the capillaries are the only blood vessels whose walls are thin enough to permit exchanges between the blood and the surrounding interstitial fluid
Wiki User
∙ 13y ago
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Why are there more arterioles in mammals than main arteries?
Arterioles carry bloo, under lower pressure than arteries, from arteries to capillaries. They also control the flow of blood between the two. In mammals main arteries are located primarily in and around the heart, whereas arterioles connect these to the capillaries
What is a vessel that returns blood back to the heart after it's passed through the capillaries?
ARTERIES carry blood TO the capillaries throughout the body, whereas VEINS carry blood FROM the capillaries and back to the heart. Tip for rememering: A-->V (alphabetical order: arteries-->veins)
Why are arteries organs but capillaries not?
organ is a structure made up of 2 or more no. of tissues(group of similar cells structurally and functionally)....artery is made up of endothelial cells, muscle fibres, elastic fibres etc placed in layers...hence is an organ. whereas capillaries only have endothelial cells.
What is the direction of blood flow?
In the arteries it is away from the heart (centrifugal), in the veins it is toward the heart (centripetal).
Does active transport rely on the process of diffusion?
Yes except, diffusion is a passive process (no energy is required) whereas active transport requires energy. this is because it is moving UP then concentration gradient whereas diffusion moves DOWN it
Is it true diffusion is a type of active transport?
Yes except, diffusion is a passive process (no energy is required) whereas active transport requires energy. this is because it is moving UP then concentration gradient whereas diffusion moves DOWN it
What the difference between contagious diffusion and hierarchical diffusion?
contagious diffusion is strongly associated with local distance effects, whereas hierarchical diffusion often involves the leapfrogging of innovations among widely separated places
How are capillaries differ from veins and arteries?
Arteries carry blood away from the heart to body tissues. Capillaries are present near almost every body cell, and they are known as exchange vessels because they permit the exchange of nutrients and wastes between the body's cells and the blood. Veins are the blood vessesl that convey blood from the tissues back to the heart.
Why are arteries represented as red in diagrams?
Systemic Arteries are represented as red in diagrams because they have oxygen in the blood, whereas Pulmonary Arteries are represented as blue because they carry deoxygenated blood.
What are differerences between veins and arteries?
Structurally, veins and arteries are very similar. The main differences is that veins move blood towards the heart, whereas arteries move blood away from the heart.
What system does the vien do?
Veins are part of the cardiovascular system. They are much the same as arteries and carry blood towards the heart, whereas arteries carry it away.
Where in the body are veins and arteries?
Veins and arteries are found throughout the body. Veins transport "used" or de-oxygenated blood back to the heart whereas arteries deliver oxygenated blood throughout the body.
