File Details
Dissection - The Heart | |
File name | Dissection - The Heart |
File Description | Mammals have four-chambered hearts and double circulation. The heart of a bird or mammal has two atria and two completely separated ventricles. The double-loop circulation is similar to amphibians and reptiles, but the oxygen-rich blood is completely separated from oxygen-poor blood. The left side of the heart handles only oxygenated blood, and the right side receives and pumps only deoxygenated blood. With no mixing of the two kinds ofblood, and with a double circulation that restores pressure after blood has passed through the lung capillaries, deliveryof oxygen to all parts of the body for cellular respiration is enhanced. As endotherms, which use heat released from metabolism to warm the body,mammals require more oxygen per gram of body weight than other vertebrates of equal size. Birds and mammals descended from different reptilian ancestors, and their four-chambered hearts evolved independently - an example of convergent evolution |
Category Name | Biology |
Subject Name | Dissection |
Module Name | Human Organs |
Micro Category Name | -- |
Level | Bachleors |
File Type | Video |
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