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Core - Biology

    Chapter 20

    Musculoskeletal System

    20.1 : What is the Skeletal System?01:02

    20.1 : What is the Skeletal System?

    Overview The adult human skeleton comprises 206 bones that are connected through cartilage, tendons, and ligaments. The skeleton provides a rigid ...

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    20.2 : Bone Structure01:55

    20.2 : Bone Structure

    Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of ...

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    20.3 : Joints01:26

    20.3 : Joints

    Joints, also called articulations or articular surfaces, are points at which ligaments or other tissues connect adjacent bones. Joints permit movement and ...

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    20.4 : Bone Remodeling01:40

    20.4 : Bone Remodeling

    Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain ...

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    20.5 : Skeletal Muscle Anatomy00:55

    20.5 : Skeletal Muscle Anatomy

    Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal ...

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    20.6 : Classification of Skeletal Muscle Fibers01:48

    20.6 : Classification of Skeletal Muscle Fibers

    Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three ...

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    20.7 : Muscle Contraction01:15

    20.7 : Muscle Contraction

      In skeletal muscles, acetylcholine is released by nerve terminals at the motor end plate—the point of synaptic communication between motor ...

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    20.8 : Cross-bridge Cycle01:26

    20.8 : Cross-bridge Cycle

    As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the ...

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    20.9 : Motor Units00:46

    20.9 : Motor Units

    A motor unit consists of two main components: a single efferent motor neuron (i.e., a neuron that carries impulses away from the central nervous system) ...

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    20.10 : The Spinal Cord01:54

    20.10 : The Spinal Cord

    The spinal cord is the body’s major nerve tract of the central nervous system, communicating afferent sensory information from the periphery to the ...

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    20.11 : Nociception01:44

    20.11 : Nociception

    Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing ...

    27.7K views
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