Skeletal Muscle Contraction Case Study

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When bones and muscles connect a joint is formed. At this point both are joined together by the help of tendons, which is a connective tissue. When we have to move a joint the muscle receives an electrical signal from brain. It causes movement to occur, because this causes the contraction in it. This contraction pulls on the corresponding bone at its insertion point. Stationary bone is called the point of origin for the skeletal muscle, while the one which moves is known as the point of insertion. This together movement in skeletal and muscular systems cause the body movements and actions. When the signal to relax is received, muscle moves back to its original position and so do the bones.

Section C
1. Outline the composition of bone, the structure of a long bone and explain the functions of the skeleton?
Bone mainly consists of collagen fibres and
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While cortical bone accounts for 80% of the mass of bone in the human body, it has a much lower surface area than cancellous bone due to its lower porosity.
Cancellous (or spongy) bone is located at the ends of long bones, accounts for roughly 20% of the total mass of the skeleton, and has an open, honeycomb structure. It has a much lower Young’s modulus than cortical bone, and this graded modulus gradually matches the properties of the cortical bone to the cartilage that forms the articulating surface on the femoral head.
The Bones of the skeleton protect the vital organs. The brain and eyes are protected by the skull, while the heart and lungs are protected by the ribcage. The skeleton also provides a framework for the human body. Without bones, the body would not be able to maintain its shape. Instead, skin, organs and blood vessels would all be in a pile on the ground. Tendons attach the muscles to the bones, which allow humans to walk, jump, talk and perform hundreds of other

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