7-04 Guided Notes .rtf - Biology Notebook 07.04 Muscular...

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Biology Notebook: 07.04 Muscular, Skeletal, and Integumentary Objectives: Describe the structure and functions of the skeletal system Describe the structure and functions of the muscular system Explain how the muscular and skeletal systems work together Explain that the largest organ in the body is also body’s first line of defense against pathogens Key Questions and Terms Notes The Skeletal System What 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 Structure Describe the layers of bone: Cartilage Spongy Bone Compact 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 Marrow Periosteum Osteoclast Osteoblast meet. Cartilage also grows near the growth plates at either end of long bones, such as those in the arms and legs. This cartilage is gradually replaced 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.

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