Many of the branches of the coronary arteries are of the
d artery type. If such
a branch is closed for any length of time, the tissue in the area supplied will
.
23.
The blood from the tissues of the heart is collected by the
c veins. These
veins empty into the
y sinus, a vessel that in turn empties into the right
.
24.
The pumping action of the heart continues without stopping until
. During
each cycle, the heart changes in sh
and s
and tends to r
. The number
of cycles per minute is called the heart
. To reduce friction, the heart is enclosed
within a
s sac, called the p
m.
25.
Intimately covering the surface of the heart is the v
l pericardium, also
called the e
. The outer serous membrane is the p
pericardium. The
pericardial fluid provides l
n and reduces the amount of work done by the
.
26.
In addition to the force provided by contraction of the ventricular walls, blood is
also driven by the e
cr
l of the arterial walls.
The highest arterial pressure is called the
stolic pressure, and the lowest is
called the
stolic pressure.
Pressure on the blood in the arteries can be further increased by vaso_________
and
y.
27.
Structures that ensure that blood flows in only one direction in the veins, are
the
s. When a vein is subjected to pressure, the result is a
p effect. Veins
receive pressure from the
ies, muscular
ns, and
y.
28.
Capillary beds are provided with pre
sphincters and post-_________
sphincters. The first can stop the flow of blood into the
s. When the
postcapillary sphincters close, more fluid flows into the t
ce.
29.
As it returns to the trunk, cool venous blood is gradually warmed by the
l
blood flowing in the opposite direction.
30.
In general, the lymphatic system is a
ge system that picks up tissue
s
and returns them to the cardiovascular system. These are picked up in the in
l
spaces.
MD0007
10-27