COMPARING HUMAN BLOOD TO THAT OF OTHER VERTEBRATES

Human blood contains three main types of cells: the red blood cells, a variety of white blood cells, and the small platelets. Do you think that the blood cells of other vertebrates would serve similar functions? In what ways are the red blood cells different from those of humans?

Fish, frog, and turtle blood

fish bloodfrog blood

turtle blood

During early mammalian development, the first red blood cells which are made differ from those which circulate throughout the rest of life. The following images were taken from a developing pig embryo.

red blood cellsredblood cells

WHAT SPECIFIC SIMILARITIES AND DIFFERENCES DID YOU NOTICE BETWEEN THE HUMAN STRUCTURES AND THOSE OF OTHER VERTEBRATES? HOW DO THESE STRUCTURAL SIMILARITIES/DIFFERENCES COMPARE TO SIMILARITIES/DIFFERENCES IN LIFESTYLE? WHAT MAKES HUMANS UNIQUE? WHAT RELATIONSHIPS BETWEEN ORGANISMS DO YOU FEEL ARE SUPPORTED BY YOUR COMPARISONS OF THEIR FEATURES? WHAT FEATURES DO YOU FEEL DEFINE A PARTICULAR GROUP?