Well, in summary then, in this lecture we’ve
covered the main classes of blood vessels:
the arteries, the arterioles, the capillaries,
the venules and the veins.
We’ve talked about the layer structure of
the blood vessels the arteries and the veins;
the tunica intima, the small thin layer right
next to the lumen, the channel of the blood
vessel; the tunica media with its smooth muscles
for contacting and relaxing; and the tunica
adventitia which is fibrous tissue and fat
cells that keep the blood vessels in place
in the place where they’re located.
And we’ve talked a bit about the physical
principles: blood flow, velocity, the law
of continuity in terms of the continuous circulation
of the blood.
And we talked a bit about the law of the capillary:
how the forces of blood pressure work against
osmotic pressure in order to prevent fluid
from getting out into the tissues in more
than a very small amount, which is drained
by the lymphatics.