Ch. 5 The Nervous, Muscular, and Skeletal Systems Flashcards
Human movement system (HMS)
The collective components and structures that work together to move the body: muscular, skeletal, and nervous systems.
Kinetic chain
A concept that describes the human body as a chain of interdependent links that work together to movement.
Nervous system
A network of neurons that transmit and coordinate signals, providing a communication network within the human body.
Neuron
Specialized cell that is the functional unit of the nervous system.
Nucleus
Cellular structure or organelle that contains the majority of the cell’s genetic material in the form of chromosomes.
Organelles
Tiny cellular structures that perform specific functions within a cell. Examples include nuclei, mitochondria, lysosomes, ribosomes, and the endoplasmic reticulum.
Mitochondria
The parts of the cell that use nutrients to create energy for the cell, commonly known as the powerhouse of the cell.
Effector sites
A part of the body, such as a muscle or organ, that receives a signal from a neuron to produce a physiological response.
Electrolytes
Minerals that have an electrical charge to help transmit nerve impulses throughout the body, such as sodium, potassium, and magnesium.
Central nervous system (CNS)
A division of the nervous system that includes the brain and spinal cord.
Peripherals nervous System (PNS)
Nerves that connect the rest of the body to the Central Nervous System (CNS)
Afferent pathway
Sensory pathway that relays information to the central nervous system.
Efferent pathway
A motor pathway that relays information from the central nervous system (CNS) to the rest of the body.
Interneurons
Neurons located within the spinal cord and brain that transmit impulses between afferent and efferent neurons.
Mechanoreceptors
Specialized structures that respond to mechanical forces (touch and pressure) within tissues and then transmit signals through sensory nerves.
Somatic Nervous System
Nerves that serve the outer areas of the body and skeletal muscle and are largely responsible for the voluntary control of movement.
Autonomic Nervous system
A division of the peripheral nervous system that supplies neuronal input to organs that run the involuntary processes of the body (e.g., circulating blood, digesting food, producing hormones).
Sympathetic Nervous System
Subdivision of the autonomic nervous system that work to increase neural activity and put the body in a heightened state.
Parasympathetic nervous system
Subdivision of the autonomic nervous system that works to decrease neural activity and put the body in a more relaxed state
Sensory function
Ability of the nervous system to sense changes in either the internal or external environment.
Proprioception
The body’s ability to naturally sense its general orientation and relative position of its parts.
Integrative function
The ability of the nervous system to analyze and interpret the sensory information to allow for proper decision-making, which produces an appropriate response.
Motor function
The neuromuscular (or nervous and muscular systems) response to the intergrated sensory information.
Muscle spindles
Sensory receptors sensitive to change in length of the muscle and the rate of that change.
Stretch reflex
Neurological signal from the muscle spindle that causes a muscle to contract to prevent excessive lengthening.
Golgi tendon organ (GTO)
A specialized sensory receptor located at he point where skeletal muscle fibers insert into the tendons of skeletal muscle; sensitive to changes in muscular tension and rate of tension change.
Joint receptors
Receptors located in and around the joint capsule that response to pressure, acceleration, and deceleration of the joint.
Neuroplastocoty
The concept that the brain will continually change or grow, reforming neural pathways throughout an individual’s entire life span.
Neurocircuitry
The interconnection of neurons in the brain and spinal cord.
Motor skills
Specific movements through the coordinated effort of the sensory and motor subsystems.
Three-stage process that explains the development of motor skills
Stage 1 - (cognitive): The client is just learning a skill. They understand the goal of the skills and develop movement strategies and can perform the skills but with inconsistent performance.
Stage 2 (associative): The client begins to understand the skill. Through practice, they refine the skill and movement strategy and can perform the skill with less error.
Stage 3 (autonomous): The client has mastered the skill. They perform the skill consistently with no error and independently modify the skill without error.
Road map to teaching clients new skills (basked on the three-stage process)
During Stage 1 (cognitive), you may need to use simple instructions and break down the skill into smaller steps so your clients will be able to understand the goals of the movement.
During stage 2 (associative), you may need to help refine your clients’ skills through practice and regular feedback.
During stage 3 (autonomous), you may be able to teach your clients new versions of the skill to further challenge them.
Skeletal system
A description of the bones of the body.
Osteoproposis
A condition of reduced bone mineral density, which increases risk of bone fracture.
Joints
The sites where two bones meet and movement occurs as a result of contraction.
Axial skeleton
A division of the skeletal system consisting of the skull, the rib cage, and the vertebral column.
Appendicular skeleton
A division of the skeletal system consisting of the arms, legs, and pelvic girdle.
Levers
Rigid rods where muscles attach
Remodeling
The process by which bone is constantly renewed by the resorption and formation of the bone structure.
Osteoclasts
Special cell that break down and remove old bone tissue.
Wolff’s law
Scientific explanation of how remodeling (new bone growth) occurs along the lines of stress placed on the bone.
Depressions
Flattened or indented portions of bone.
Processes
Projections protruding from the bone where tendons and ligaments can attach.
Vertebral Column
Bones that house the spinal cord; consists of the cervical, thoracic, and lumbosacral regions.
Spinal Cord
Bundle of nerves housed within the vertebrae
Structures of the spine
Breakfast at 7 am = 7 cervical vertebrae at the neck
Lunch at 12 pm = 12 thoracic vertebrae at the mid-back
Dinner at 5 pm = 5 lumbar vertebrae at the low-back
Intervertebral discs
Fibrous cartilage structures between vertebrae that act as shock absorbers and assist with movement.
Neutral spine
Represents a position in which the vertebrae and associated structures are under the least amount of load and can most optimally support functional movement. S shape
Osteokinematics
Movement of a limb that is visible
Arthrokinematics
The descriptions of joint surface movement; consists of three major types: roll, slide, and spin.
Synovial joints
A joint with fluid-filled joint capsule.
Noaxial
A gliding joint that moves in only one place, either back and forth or side to side.
Nonsynovial joints
Points that have no joint capsule, fibrous connective tissue, or cartilage in the uniting structure.
Ligament
A fibrous connective tissue that connects bone to bone.
Collagen
A protein found in connective tissue, muscles and skin that provides strength and structure. It is the most abundant protein in the human body.
Elastin
A protein that provides elasticity to skin, tendons, ligaments, and other structures.
Growth plate
A specialized cartilage disc located in the epiphysis that is responsible for longitudinal bone growth.
Skeletal muscle
The type of muscle tissue that connects to bones and generates the forces that create movement.
Fascia
Connective tissue that surrounds muscles and bones.
Epimysium
Inner layer of fascia that directly surrounds an entire muscle, commonly referred to as the “deep fascia.”
Fascicles
Largest bundles of fibers within a muscle. Fascicles are surrounded by perimysium.
Perimysium
Connective tissue surrounding a muscle fascicle.
Endomysium
Connective tissue that wraps around individual muscle fibers withink a fascicles.
Glycogen
Glucose that is deposited and stored in bodily tissien, such as the liver and Muscat cells; the storage form of carbohydrate.
Myoglobin
Protein-based molecule that carries oxygen molecules into the muscles.
Myofibrills
The contractile components of a muscle cell; the myofilaments (actin and myosin) are contained within a myofibril.
Myofilaments
The finale nets of a myofibril; include actin and myosin.
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Actin
The thin string like myofilament that acts along with myosin to produce muscular contraction.
Myosin
The thick myofilament that acts along with actin to produce muscular contraction.
Sarcomere
The structural unit of a myofibibril composed of actin and myosin filaments between two Z-lines.
Z-line
The meeting point of each sarcomere.
Neutral activity
The nervous system’s signal that tells a muscle to contract.
Neuromuscular junction
The specialized site where the nervous system communicates directly with muscle fibers.
Synapses
A junction or small gap between the motor neuron and muscle cells.
Motor unit
A nitro neuron and all of the muscle fibers that it innervates.
Action potential
Nerve impulses that is relayed from the central nervous system, through the peripheral nervous system, and into the neuromuscular junction.
Muscle Anatomy Flowchart
Muscle: .. ⬇️ Fascicle: ⬇️ Muscle fiber: ⬇️ Myofibril: ⬇️ Sarcomere: ⬇️ Myofilament: the individual portion structures, actin and myosin, that make up a myofibril.
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Neurotransmitters
Chemical messengers that cross the synapse between neuron and muscle and assist with nerve transmission.
Acetylcholine (ACh)
A neurotransmitter that helps the action potential cross the synapse into the muscle, which initiates the steps in a muscle contraction.
Sliding filament theory
The series of steps in muscle contraction involving how myosin (thick) and actin (thin) filament slide past one another to produce a muscle contraction, shortening the entire length of the sarcomere.
Excitation-contraction coupling
The physiological process of converting an electrical stimulus to a muscle contraction.
Power Stroke
The myosin heads bind to actin and pull them toward the sarcomere center, which slides the filaments past each other, shortening the muscle.
Adenosine triphosphate (ATP)
A high-energy molecule that serves as the main form of energy in the human body; known as the energy currency of the body.
Resting length
The length of a muscle when it is not actively contracting or being stretched.
Type I (slow twitch) muscle fibers
Muscle fibers that are small in size, generate lower amounts of force, and were more resistant to fatigue
