Question
Why is the wall tension in capillaries so small?(a) There are so many capillaries.(b) Their radii are so small.(c) The outward pressure of the blood inside is so small.(d) $b$ and $c$(e) $a, b,$ and $c$
Step 1
Mathematically, this can be represented as: \[ T = P \times r \] where \(T\) is the wall tension, \(P\) is the pressure inside the vessel, and \(r\) is the radius of the vessel. Show more…
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Blood flow in the capillaries is steady despite the rhythmic pumping of the heart because of the (a) elasticity of the large arteries, (b) small diameter of capillaries, (c) thin walls of the veins, (d) venous valves.
Blood flow through capillaries is slow because a. lots of blood volume is lost from the capillaries. $b$. the pressure in venules is high. $c$. the total cross-sectional area of capillaries is larger than that of arterioles. $d$. the osmotic pressure in capillaries is very high. $e .$ red blood cells are bigger than capillaries and must squeeze through.
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