Chapter 5 - Nervous, Skeletal, And Muscular Systens Flashcards
Human movement system (HMS)
Collective components and structures that work together to move the body: nervous, skeletal and muscular systems
Kinetic chain
Concept that describes the human body as a chain of interdependent links that work together to perform movement
Nervous system
A network of specialized cells called neurons that transmit and coordinate signals, providing communication network within the human body
Neuron
Specialized cell, functional unit of nervous system
Nucleus
Cellular structure or organelles that contains the majority of the cells genetic material in 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 powerhouses 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.
Peripheral nervous system (PNS)
Nerves that connect the rest of the body to the central nervous system.
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 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.
Automatic nervous system
A division of the peripheral nervous system that supplies neural 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 works 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 integrated 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
specialized sensory receptor located at the 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 respond to pressure, acceleration, and deceleration of the joint.
Neuroplasticity
The concept that the brain will continually change or grow, reforming neural pathways throughout an individual’s entire life span.
Neurocircuity
The interconnection of neurons in the brain and spinal cord.
Skeletal system
A description of the bones of the body
Osteoporosis
A condition of reduced bone material density, which increases risk of bone fracture
Joints
The sites where two bones meet and movement occurs as a result of muscle 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 cells that break down and remove old bone tissue.
Osteoblasts
Special cells that form and lay down new 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 intended portions of bone
Vertebral column
Bones that house the spinal cord; consists of the cervical, thoracic and lumbosacrao regions
Spinal cord
Bundle of nerves housed within vertebrae
Osteokinematics
Movement of a limb that is visible
Arthrokinematics
Description of joint surface movement; consists of 3 major types: roll slide, and spin
Synovial joints
Joint with fluid-filled joint capsule
Nonaxial
Gliding joint that moves in only one plane, either back and forth or side to side.
Nonsynovial joints
Joints that have no joint capsule, fibrous connective tissue, or cartilage in uniting structure
Ligament
Fibrous connective tissue that connects bone to bone
Collagen
Protein found in connective tissue, muscles, and skin that provides strength and structure. It is the most abundant protein in the human body.
Elastin
Protein that provides elasticity to skin, tendons, ligaments, and other structures
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 within a fascicle.
Glycogen
Glucose that is deposited and stored in bodily tissues, such as the liver and muscle cells; the storage form of carbohydrate
Myogloban
Protein-based molecule that carries oxygen molecules into the muscles.
Myofibrils
The contractile components of a muscle cell; the myofilaments (actin and myosin) are contained within a myofibril.
Myofilaments
The filaments of a myofibril; include actin and myosin.
Actin
The thin, stringlike, 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 myofibril composed of actin and myosin filaments between two Z-lines.
Z-line
The meeting point of each sarcomere.
Action potential
Nerve impulse that is relayed from the central nervous system, through the peripheral nervous system, and into the muscle across the neuromuscular junction.
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.
Power stroke
Myosin heads bind to actin and pull them toward the sarcomere center, which slides the filamentspast each othern shortening the muscle
Adenosine triphosphate (ATP)
High-energy molecule that serves as the main form of energy in the human body; known as the energy currency of my body
Resting length
Length of a muscle when it’s not actively contacting or being stretched
Type I muscle fiber
Muscle fibers that are small in size, generate lower amounts of force, and are more resistant to fatigue.
Type II muscle fibers
Muscle fibers that are larger in size, generate higher amounts of force, and are faster to fatigue.
All-or-nothing principle
Motor units cannot vary the amount of force they generate; they either contract maximally or not at all.
Capillaries
The smallest blood vessels and the site of exchange of elements between the blood and the tissues.
