This document summarizes circulatory systems in different organisms. It describes that reptiles have a three-chambered heart, while fish hearts have four chambers including two atria and two ventricles. The human heart is described as having four chambers - two atria and two ventricles. All of these organisms have closed-loop circulatory systems. The document also discusses similarities and differences between these hearts, and provides information about red blood cells, white blood cells, and platelets.

1. Circulatory Systems
Lucia Empina Harry
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2. Reptile Heart ( Using Snake As
An Example )
• Heart consists of three parts
; right atrium,left atrium
and a ventricle.
• It is a closed-loop
circulatory system

3. Fish Heart It is a closed-loop circulatory
•
sytem
•
Heart consists of four
parts,including two chambers and
an entrace and exit
•
First part . SINUS VENOSUS – a
thin-walled sac that collects blood
from the fish’s veins before
allowing it to flow to the second
part
•
Second part. ATRIUM – a large
muscular chamber, serve as oneway antechamber, that sends
blood to the third part
•
Third part. VENTRIcle – thinwalled,muscular chamber and it
pumps blood then bulbus
arteriosus that connects to the
aorta which blood flows to the
gills for oxygenation and then out
of the heart.

4. Human Heart
•
Closed-loop circulatory system
• Heart consists of four chambers;
Right and Left atrium, Left and
Right Ventricle
• Blood that is pumped to the
RIGHT atrium is Deoxygenated
which is poor in oxygen and
passed into the right ventricle to
be pumped through the
pulmonary artery to the lungs
for reoxygenation and removal
of carbon dioxide.
• LEFT atrium receives verly
oxygenated blood from the
lungs as well as the pulmonary
vein which is passed into the
strong left ventricle to be
pumped through aorta to be
different organs of the body.

5. Similarities
• Closed-loop circulatory system
(Blood never leaves the network
of arteries, veins and capillaries)
• Both have right and left atrium
• Both have valves and SA nodes

6. Differences
• The flow of blood in the heart

7. Blood cell ( Hematocyte )
Red Blood Cell ( Erythrocyte )
• Primarily carry oxygen and collect
oxygen through the use of hemoglobin

8. Blood cell ( Hematocyte )
White Blood Cell ( Leukocytes )
• Cells of the immune system in defending
the body against both infectious disease
and foreign material
• Produced and derived from a
multipotent cell in the bone marrow as a
hematopoitic stem cell
• Especially in the lymphatic system

9. Blood cell ( Hematocyte )
Platelets ( Thrombocytes )
• Circulate in the blood of mammals and
are invovled in hemostasis, leading to
the function of blood clots