Circulatory system in Apple Snail
The circulatory system consist of
1. Heart
2. Blood Vessel
3. Blood
(I) Heart
:
it is two chambered consist of an auricle and a ventricle and lies
enclosed in the pericardium
a. Pericardium
: thin walled oval chamber enclosing the heart and
situated
between the pulmonary chamber and the posterior renal sac
b. Auricle
: thin walled roughly triangular sac highly contractile in nature. It
receives blood from three main veins (a) efferent ctenidial vein (b) efferent
renal vein and pulmonary vein. At lower
end it is connected with
ventricle through auriculo-ventricular aperture. This aperture is guarded by
semi-lunar valves which prevent backflow of blood.
c. Ventricle
: it is an ovoid sac lying below the auricle and has thick muscular
and spongy walls. From the lower end of the ventricle
arises a large artery
the aortic trunk or
aortic ampulla.
The opening between ventricle and aorta
is guarded by semi-lunar valves which prevent backflow of blood.
(II) Blood Vessels
: It includes artery, sinus and veins.
1.
Arteries
: The aortic ampulla divides immediately into two branches
a
.
Cephalic aorta
(it gives off three arteries on outer side
and one artery on
inner side)
(i) A cutaneous artery
(ii) A pair of oesophageal arteries
(iii) A thick pallial artery
(iv) A pericardial artery
After giving off above branches, reachs the posterior renal chamber and
supplies both renal chambers by many renal arteries
The main branch of the cephalic aorta now runs along the left side of
oesophagus and gives off a number of small
branches to oesophagus
and floor of the mantle cavity. On right side it divides into three branches
(a)
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