Presentation on theme: "Dissecting a Leg We can learn about our skeletal system by looking at the skeletal system of other animals."— Presentation transcript:
Dissecting a Leg We can learn about our skeletal system by looking at the skeletal system of other animals.
The human leg is very much like the leg of a chicken. Both have a large thigh bone, a knee joint, and two shin bones.
Just like your leg, the chicken leg has: Skin Bone Muscle Cartilage Fat
Pull the skin back and look for: Blood vessels in the skin Cartilage around the bone Joint Muscle Fat
Use your scissors to cut away some of the meat so you can find: Cartilage protecting the end of the bone Tendons that hold the muscle to the bone Different shaped muscle Lots of fat
Cut away the rest of the muscle so you can see the joint and cartilage. The joint bends just like a human knee. Look at the cartilage protecting the bone.
This leg has a hinge joint. It allows the joint to move in one direction only. Look at how the two parts fit together so that the joint can bend. Ligaments hold bone to bone. Cartilage keeps bones from touching each other.
Break the bone to see the marrow. Marrow is red and jelly-like. Marrow makes red blood cells that carry food and oxygen to all the cells of our body, and platelets that allow our blood to clot.
When you eat a chicken leg, remember what you have learned about your skeletal system. bone marrow cartilage muscle joint tendon ligament