Red blood cell Carry oxygen. Contain haemoglobin (rich in iron) to carry oxygen. Biconcave shape to provide a large surface area for the diffusion of oxygen. No nucleus to provide more space for ...

Locate each of the paired and unpaired branches from the dorsal aorta, using Figure 5.4, pages 58 - 60. Keep function and integration of circulatory system in mind as you locate organs.