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Qs about bones

1. Think about an arthropod such as an ant, and a vertebrate such as a lizard. what functions do the skeletons of there animals have in common? do they have a common structure? Explain.

2. Why do you think that spongry bone has an outer layer od compact bone?

3. Think about the possibible movements of your lower arms and lower leg. How do the movements differ and why?

( please provide a detailed answer)

Solution Preview

1. In both ants and lizards, the skeleton provides shape and support for their bodies and protects internal organs. One common feature of both skeletons is that they form points of attachment for the muscles which, in turn, allows movement of the organism. The difference is that the arthropod has an exoskeleton, while the lizard has an internal skeleton made of bones and cartilage.

The exoskeleton (external skeleton) is a rigid external covering or outer shell that protect the ant's internal organs. The exoskeleton is quite complex and is made up of many layers of materials. The most important component of the exoskeleton is called chitin, which is a complex carbohydrate molecule that is linked together in chains. Muscles that are important for movement attach to the inside of the exoskeleton (please see the picture in attachment 1). The ...