2GENBIO2 - CIRCULATORY SYSTEM

Open systems have blood contained in vessels at all times.

Closed systems allow fluid to bathe tissues directly in open spaces.

Open systems allow fluid to bathe tissues directly in open spaces.

Closed systems do not use the heart to pump blood.

Amphibians have two atria and two ventricles; birds and mammals have a single ventricle.

Amphibians have a single atrium and ventricle; birds and mammals have two atria and two ventricles.

Amphibians have two atria and a single ventricle; birds and mammals have two atria and two ventricles.

Both amphibians and birds/mammals have two atria and a single ventricle.

It carries oxygen-rich blood from the heart to the lungs.

It returns oxygenated blood to the heart via pulmonary veins.

It carries O2-poor blood from the heart to the lungs.

It supplies the heart muscle with oxygenated blood.

Pulmonary circuit

Systemic circuit

Coronary circuit

Digestive circuit

Atrium

Septum

Ventricle

Valve

To pump blood

To separate the sides of the heart

To keep the blood moving in the right direction

To receive blood

Vein

Artery

Capillary

Venule

Right ventricle

Left ventricle

Right atrium

Left atrium

Left atrium → Left ventricle → Aorta → Body tissues

Left atrium → Right ventricle → Aorta → Body tissues

Left atrium → Pulmonary artery → Body tissues

Left atrium → Right atrium → Aorta → Body tissues

Superior and inferior vena cava

Pulmonary veins

Aorta

Pulmonary arteries

having a closed system

having a four-chambered heart

having a circulating hemolymph

having a movement of blood through four seperate circuits

Fishes

Amphibians

Birds

Mammals

Arteries carry blood away from the heart, and veins carry blood toward the heart.

Arteries carry blood toward the heart, and veins carry blood away from the heart.

All arteries carry O2-rich blood, and all veins carry O2-poor blood.

Arteries carry O2-poorblood, and all veins carry O2-rich blood.