1. Heart Structure

5. Similarities & Differences
Characteristics
Hearts
Fish
Reptiles
Amphibians
No. of atrium
One
Two
Two
No. of ventricles
One
One
Two
No. of chambers
Two
Three
Four
-
Mixed in
ventricle
Separated in
different
chambers
Single
Double
Double
Condition of
oxygenated &
deoxygenated blood
Type of circulation

6. Blood cells ( Hematocytes )
O There are three categories :

Red blood cells
(Erythrocytes)
 White blood cells
(Leukocytes)
 Platelets (Thrombocytes)

7. Functions of Blood Cells
O Red blood cells (Erythrocytes)
carry oxygen and collect carbon dioxide through
the use of hemoglobin
O White blood cells (Leukocytes)
defend the body against both infectious
diseas and foreign materials.

8. O Platelets (Thrombocytes)
Help in blood cotting
- Form hemostatic plug
- Activate coagulation mechanism