messageds = new Array() messageds[0] = null; messageds[1] = "Superior vena cava:

collects all blood from upper
half of body and returns
it to heart. " messageds[2] = "Internal and external
jugular veins:

drain blood from head,
face, and brain." messageds[3] = "Subclavain vein:

returns blood from the arm. " messageds[4] = "Gastric vein:

from the stomach." messageds[5] = "Inferior vena cava:

collects all blood from lower
half of body and returns
it to heart." messageds[6] = "Iliac vein:

collects blood from the whole
leg." messageds[7] = "Saphenous veins:

form a complex set of short
cuts and bypasses among the
leg muscles." messageds[13] = "Aorta (main artery):

to the kidney." messageds[12] = "Renal artery:

to the kidney. " messageds[14] = "Carotid arteries:

to head, face and brain." messageds[11] = "Palmar and digital veins:

collect blood from fingers and
hand." messageds[9] = "Renal vein :

from the kidney" messageds[8] = "Dorsal venous arch:

a loop of vein in the upper
foot. " messageds[10] = "Pulmonary artery:

to the lungs" messageds[24] = "Circulation

Blood Flows round and round
through blood vessels. This
is called circulation. From the
heart's left side blood passes
into the aorta (main artery),
then into other arteries. Each
artery branches 15 or 20
times, becoming smaller and
smaller. The smallest arteries
lead into anetwork of minute
capillaries.The thin walls of
these capillaries allow oxygen
and nutrients to diffuse
through them from the blood
into the body tissues. In due
course, the capillaries join
other capillaries, eventually
forming veins. These take
blood back to the heart's right
side.This side pumps it to the
lungs to collect more oxygen,
and from there it returns to the
heart's left side. "