Simon Fraser University3 年
Trends in organ systems - Vertebrate circulatory systems
Circulatory system is the first organ system to become functional during development ... Heart has completely separated: 2 atria, 2 ventricles, 4 chambers, and adult bird has complete double ...
BBC2 年
The circulatory system
It has four chambers. Humans have a double circulatory system, which means the blood passes through the heart twice on each loop around the body. It travels from the heart to the lungs ...
Simon Fraser University3 年
Trends in organ systems - Vertebrate circulatory systems
Circulatory system is the first organ system to become functional during development ... Heart has completely separated: 2 atria, 2 ventricles, 4 chambers, and adult bird has complete double ...