CHICKEN LEG DISSECTION

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Dissecting a Chicken Leg Birgit Self 4/13/09 TWU EDUC 5131

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Dissecting a Chicken Leg Background Information: A group of CELLS working together form a TISSUE. A group of _________ working together form an ORGAN. A group of _________ working together form a SYSTEM A bone is an organ made of several tissues . Each human body contains 206 different bones. Inside the bone is a soft tissue called marrow, where the body's blood cells are produced. There are two types of marrow: yellow marrow and red marrow. It is the red marrow that produces red blood cells, white blood cells and platelets. bone marrow Just like other living tissues in the body, the bones must be supplied with blood or they will die.

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Dissecting a Chicken Leg Background Information: The skeletal system has three very important jobs. Support, protection, and movement. Just think, if we did not have a skeletal system we would be just like jelly. The bones also protect many organs, and also the brain. Our skull protects the brain and our ribs protect our heart and lungs.

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Dissecting a Chicken Leg Background Information: The place where bones are connected is called a joint. A skeleton without joints would be like a statue. There are several different types of joints in our body: fixed joints, slightly movable joints and freely movable joints .

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Dissecting a Chicken Leg Different Joints: Shoulder Elbow Wrist Hip Knee Ankle

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Dissecting a Chicken Leg Activity Instructions Materials: • A raw chicken leg quarter A knife and a pair of scissors Tweezers A tray • Latex gloves Vocabulary: BONES: femur, tibia, fibula TISSUES: Bones, muscles, skin, cartilage, tendons, bone marrow Birgit Self 4/13/09 TWU EDUC 5131

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Dissecting a Chicken Leg Lab Goals: To observe scientifically the shape, colour, and properties of Muscle, Skin, Ligament, Tendons and Cartilage Tissue. To record how the tissues are attached together to make a moveable joint, like the knee joint Dissection Drawing:

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Dissecting a Chicken Leg Group Instructions Procedure: 1. Many animals have skeletal systems that are very similar to ours. Our leg is very much like that of a chicken leg including: femur (thigh bone) knee (hinge joint) fibula and tibia (smaller bones of the shin) cartilage ligaments 2. Place the chicken leg, skin side up, in the tray . Notice the texture of the skin. Note the follicles where feathers grew. 3. Turn the chicken leg over. The part of the chicken we call the meat is actually the muscle. Notice the yellow jelly-like substance which is fat. Pull off some of the fat and observe the difference in the consistency of muscle and fat.

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Dissecting a Chicken Leg Procedure: 3. Locate the end of the bone that may be seen at either end of the leg. The cartilage is the white tissue that surrounds the end of the bone to protect it. The purpose of the cartilage is to keep bones from touching each other. It stops the wearing down of bone that would occur if the bones were in constant contact with each other.

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Return the chicken leg to the skin up position. Pull the skin of the thigh back to show the underside of the skin. Locate the blood vessels of the skin. Dissecting a Chicken Leg Procedure:

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Dissecting a Chicken Leg Procedure: Remove the remainder of the skin. Review the other tissue that is now visible (fat, muscle, cartilage, bone).

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Dissecting a Chicken Leg Procedure: 6. Pick up the leg and bend the joint. Notice it only moves in one direction (it’s a free moveable joint). Look at the muscles. They work in pairs. One of them contracts while the other one relaxes.

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Dissecting a Chicken Leg Procedure: 7. Using your knives and forks, carefully cut away some of the muscle to expose tendons (white areas of the muscle) that connect the muscle to the bone. Tendons are part of the muscular system. Tendons are near the ends of the bones. Ligaments are more difficult to locate. Ligaments attach the bones to other bones. Look around the joint and try to locate ligaments. Also expose the cartilage for viewing. The cartilage surrounds the bone where it would be touching another bone. Cartilage is the protective cushion between bones. Identify all the different parts you can see of the locomotor system.

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Dissecting a Chicken Leg Procedure: 8. Carefully cut away the muscle, fat, tendons, and practice identifying the different bones: femur, tibia and fibula. 9. Carefully break the joint. Notice both parts of the joint and how they fit together. Note the amount of cartilage protecting each part of the joint. Important points to remember: - cartilage is between bones - ligaments hold bone to bone - tendons hold muscle to bones

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10. Carefully break the largest bone. Do not crush the bone. Observe the red jelly-like tissue inside the bone. This is the bone marrow. Marrow produces red blood cells and platelets for use throughout our body. Red blood cells carry food and oxygen to all cells in our body. Platelets allow blood to clot rather than continue free flowing. Poke the marrow with the point of the scissors to show the consistency of the marrow. Dissecting a Chicken Leg Procedure:

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Dissecting a Chicken Leg Vocabulary Words: muscle blood vessel bone ligaments skin cartilage tendons joint fat A). Fibers that contract and relax to effect body movement B). An elastic tube through which blood circulates. C). A tough, semi-rigid, calcified part of the skeleton D). connects two bones together. E). Protective covering F). It covers the surface of joints, allowing bones to slide over one another, reducing friction and preventing damage. Keeps bones from touching one another. G). Connects muscle to bone H). A point of connection between two bones. I). Is important in energy metabolism, heat insulation and cushioning. A yellow jelly-like substance.

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Dissecting a Chicken Leg Check for Understanding Match the Vocabulary word to the correct definition: cartilage ligament tendon fat skin muscle blood vessel bone joint A). Fibers that contract and relax to effect body movement B). An elastic tube through which blood circulates. C). A tough, semi-rigid, calcified part of the skeleton D). Connects two bones together. E). Protective covering F). It covers the surface of joints, allowing bones to slide over one another, reducing friction and preventing damage. Keeps bones from touching one another. G). Connects muscle to bone H). A point of connection between two movable parts I). Is important in energy metabolism, heat insulation and cushioning. A yellow jelly-like substance. _____ _____ _____ _____ _____ _____ _____ _____ _____

Tags: science primary

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