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Biology Notebook: 07.04 Muscular, Skeletal, and IntegumentaryObjectives:Describe the structure and functions of the skeletal systemDescribe the structure and functions of the muscular systemExplain how the muscular and skeletal systems work togetherExplain that the largest organ in the body is also body’s first line of defense against pathogensKey Questions and TermsNotesThe Skeletal SystemWhat is the skeletal system made of?List and describe the functions of the skeletal system.5. Blood Cell Formation: Blood cells are produced in the soft marrow tissue that fills theinternal cavities of some bones.What is the axial skeleton?Bone StructureDescribe the layers of bone:CartilageSpongy BoneCompact Bone• Cartilage: Cartilage is a dense and fibrous substance that is strong but flexible. It can be found in flexible parts of the body, such as the nose and ear, and also in the areas where bones
Bone MarrowPeriosteumOsteoclastOsteoblastmeet. Cartilage also grows near the growth plates at either end of long bones, such as thosein the arms and legs. This cartilage is graduallyreplaced by bone tissue, making the now longer bone stronger. There are no blood vessels within cartilage like there are within true bone. Instead, cartilage cells receive nutrients through diffusion from the neighboring blood vessels and tissue.• Spongy Bone: A layer of less dense spongy bone may be found under the outer layer of compact bone. Spongy bone is not soft and squishy like a kitchen sponge. It is actually a strong network of thin fibers that adds strength to the bone without adding much excess weight.