Heart Structure

Similarities & DifferencesCharacteristics Hearts

Fish Reptiles Amphibians

No. of atrium One Two Two

No. of ventricles One One Two

No. of chambers Two Three Four

Condition of oxygenated & deoxygenated blood

- Mixed in ventricle

Separated in different

chambers

Type of circulation Single Double Double

Blood cells ( Hematocytes )

OThere are three categories : Red blood cells

(Erythrocytes) White blood cells

(Leukocytes) Platelets (Thrombocytes)

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.

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