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Directions I.cc I. Fill in the following information - the number of Chambers - how many of ruch - Does the organism have sin

Name: I. Comparative Hearts Blood Flow in Hearts:

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Name M. Comparative Hects: External Features Heart Structures:

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Answer #1

I   

Top left: Fish - Two chambered heart with one auricle and ventricle each.

Top middle: Frog (AMPHIBIAN) - Three chambered heart with two auricles and one ventricle.

Top right: Lizard (REPTILE) - Three chambered heart with two auricles and one ventricle. Incompletely 4 chambered hearts are seen in case of crocodiles. Two auricles and 2 ventricles. the two ventricles are not completely seperated in them which causes mixing of blood through the incomplete septum that differentiates the two ventricles. All other reptiles possess heart with 3 chambers wherein they have two auricles and one ventricle.

Bottom left: Pigeon (BIRD) - 4 chambered heart. Two auricles and two ventricles.

Bottom right: Human (MAMMAL) - 4 chambered heart. Two auricles and two ventricles.

II

  1. Top left: No. of chambers: 2;

one auricle and 1 ventricle

  single circulation

2. Top right: No. of chambers: 3

two auricles and one ventricle

double circulation (incomplete double circulation: blood reaches the heart to two different chambers (right and left atrium/auricle) but goes out from the heart from a single chamber (ventricle). This feature is seen in amphibians and reptiles.).

3. Bottom left: No. of chambers: 4

two auricles and two ventricles

double circulation

4. Bottom right: No. of chambers: 4

two auricles and two ventricles

double circulation

III

A.Auricle E.Left auricle

B.Ventricle   F.Right ventricle

C.Aorta     G.Left ventricle

D.Right auricle

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