Which of the following heart structures is best adapted
to cope with double circulation?
Answer Details
The heart is a muscular organ that pumps blood throughout the body. The circulatory system in mammals can be single or double. The double circulatory system involves blood being pumped twice: once to the lungs to pick up oxygen, and then to the rest of the body. In this type of circulatory system, there are two circuits: the pulmonary circuit and the systemic circuit.
The pulmonary circuit carries blood from the heart to the lungs where it is oxygenated, and then back to the heart. The systemic circuit carries oxygenated blood from the heart to the rest of the body, and then returns deoxygenated blood back to the heart.
To cope with this double circulation, the heart needs to have two separate pumps, each with its own set of valves. The best adapted heart structure for this is the one with two auricles and two ventricles. This is because the two ventricles can contract at different times, allowing for better separation of oxygenated and deoxygenated blood. Additionally, the two sets of valves help prevent the mixing of oxygenated and deoxygenated blood.
Therefore, the answer is: Two auricles and two ventricles.