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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 ...

    32.5K views
    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 ...

    88.3K views
    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 ...

    90.0K views
    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 ...

    116.7K views
    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) ...

    58.0K views
    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 ...

    29.1K views
    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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