Animal Circulatory Systems — Single vs. Double Circulatory

The video covers the closed circulatory system, found in many animals, including humans, fish, and other vertebrates. In this lesson, we break down the two main types of pathways: the single circulatory pathway and the double circulatory pathway, and explore how these unique systems manage blood flow to efficiently transport oxygen, nutrients, and remove waste throughout the body.

In animals with a single circulatory pathway, such as fish, blood travels in a single circuit, flowing through a two-chambered heart only once per cycle. This process provides oxygen to tissues but at a slower rate. In contrast, animals with a double circulatory pathway—like mammals, birds, and reptiles—benefit from a four-chambered heart that pumps blood through two circuits: the pulmonary circuit (for lung oxygenation) and the systemic circuit (for oxygen delivery throughout the body). This dual pathway significantly enhances oxygen supply, ensuring higher efficiency for active, larger animals.

Watch this video to gain a clearer understanding of how these two pathways work, the role of different heart chambers, and why this system is essential to survival in diverse animal species. Perfect for students, biology enthusiasts, and anyone curious about animal physiology!

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