Circulatory System

The circulatory system of an amphibian is divided into two separate loops. The pulmonary circulation carries deoxy-genated blood from the heart to the lungs and back to the heart. The systemic circulation carries oxygenated blood from the heart to the body and back to the heart.

The three-chambered heart of an amphibian reflects the division of the circulatory system into pulmonary and systemic circulation. Deoxygenated blood from the body first enters the right side of the heart, as shown in step O of Figure 40-8. Blood moves into the right atrium. In step ©, oxygenated blood from the lungs enters the left atrium. In step ©, contraction of the atria forces the deoxygenated and oxygenated blood into the single ventricle, the main pumping chamber of the heart. Although the ventricle is not divided, its spongy interior surface and the coordinated contractions of the atria keep the oxygenated and deoxygenated blood from mixing. In step O, ventricular contraction expels both kinds of blood into the conus arteriosus, which directs deoxy-genated blood to the lungs and oxygenated blood to the body.

Radio-ulna

Trunk vertebra

Sacral vertebra

Urostyle Pelvic girdle

- Spine

Tibiofibula

Metatarsals

The skeleton of the frog has adapted to absorb shocks when the frog jumps and lands.

Skull

Cervical vertebra

Pectoral girdle

Tibiofibula

Metatarsals

Amphibia Cervical Sacral Veterbra

- Spine

Phalanges'

Phalanges'

figure 40-8

Conus arteriosus

Amphibians have a three chambered heart that pumps blood to the lungs and throughout the body.

Right atrium

Ventricle

Renal vein

Kidneys figure 40-8

Amphibians have a three chambered heart that pumps blood to the lungs and throughout the body.

Conus arteriosus

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