Task 3
The skeletal system of the human
The humans skeletal system is internal, and made of bone. It has extra features to it such as ligaments and cartilage. The role of our skeletal system is to protect our vital organs (the brain, eyes, heart, lungs and spinal cord are all protected by our skeletal system), help give us support (without a skeletal system we would be a blob on the floor), and and provides a structure so that muscles can move. Bone marrow is a type of tissue that can be found in hollow bones the role of bone marrow is to produce healthy blood cells. Bones are made out of hard minerals, water, ligaments and cells. When we are infants our skeletal system consists of over 300 bones, but as we get older and become adults, the little bones join together to form bigger bones. Our skeletal system is called an endoskeleton, and most other land animals and fish, have this type of skeletal system.
The skeletal of the prawn
The prawn's skeletal system is a clear, transperant looking, outer shell, which is broken up into segments joined by a clear, ligament looking sheet. The skeletal system of the prawn keeps all of the organs, and body parts in tact and together, also it is a very streamline shape that allows them to swim through water easily. Krill, grasshoppers, crabs, ants, and shrimp also have the same type of skeletal system as the prawn (exoskeleton). Compared to the human skeletal system, it is very different! The skeletal system of humans for one is internal (endoskeleton), and for two ours is made out of bone, not an outer shell. A benefit of having this type of skeletal system is that it is very, very lightweight; so that the prawns are not weighed down in the water while swimming, and it provides them with a protective layer on the outside so they are more sheltered from predators. A disadvantage of this type of skeletal system is that due to them having to shed, they are very vulnerable to predators when making the new shell. The skeletal system of the prawn is made out of chintin, and calcium carbonate.
The skeletal system of the worm
The worm has a hydrostatic skeleton which is also known as a hydroskeleton, this works because the worm stretches out, then it retracts itself back to an average size; and the worm repeats over and over to move.
The skeletal system of the cuttlefish
The cuttlefish bone is hard, lightweight and chalky. The main role of the skeletal system of the cuttlefish is to give it support, to give it its shape, to give buoyancy to the fish so that it doesn't sink and to give it a lightweight figure. The cuttlefish skeletal system is internal (endoskeleton) and is made out of calcium carbonate, which makes it very strong, and lightweight.
Task 4
![Picture](/uploads/2/4/2/0/24203012/4763465.jpg?650)
This is a labelled diagram of the main bones in our bodies