Question

draw a three-chambered heart circulatory system, labeling where high po2 blood is and where low po2 blood. include the systemic and pulmonary circuits, as well as the ventricles and atria. indicate direction of blood flow.

Answer 1

In a three-chambered heart system, there are two atria and one ventricle.

• 1. Elevated PO2 levels shows a higher concentration of oxygen in the blood which is achievable through the purification of blood by the pulmocutaneous system.
• 2. Also, a reduced PO2 levels indicate a lower oxygen content in the blood.

In a three-chambered heart system, where there are two atria and one ventricle, the blood is pumped to the lungs for oxygenation and to the skin for respiration. This dual respiratory mechanism allows for increased oxygen intake especially in aquatic or semi-aquatic animals like amphibians.

When the blood is oxygenated through both pulmonary (lung) and cutaneous (skin) routes, it results in higher oxygen levels and leads to elevated PO2 levels in the bloodstream.

This adaptation is crucial for the survival of these organisms in various environments and contributes to their ability to extract oxygen efficiently from both air and water.