Chapter 4: The Human Movement System in Fitness Flashcards
Nervous System (pg 87)
A conglomeration of billions of cells specifically designed to provide a communication network within the human body.
What does the nervous system fundamentally perform? (pg 87)
The activation and recruitment of muscles to create movement and stabilization forces within the skeletal framework.
Obtains sensory information, both internal and external, about the environment.
The nervous system, through practice, solidifies the ability to achieve a specified outcome.
Central Nervous System CNS (pg 87)
The division of the nervous system comprising the brain and spinal cord. Its primary function is to coordinate activity of all parts of the body.
What is the role of interneurons?
Interneurons receive impulses from afferent neurons and then conduct back out to provide the efferent response.
What is the location of interneurons?
CNS - central nervous system
Motor Control (87)
How the central nervous system internal and external sensory information with previous experiences to produce a motor response.
Motor Learning (87)
The integration of motor control processes with practice and experience that leads to relatively permanent changes in the body’s capacity to produce skilled movements.
Motor Development (87)
The change in motor skill behavior over time throughout the lifespan.
The spinal cord
Is a connection between the peripheral nervous system and the brain.
Controls the body’s reflexes
Structural efficiency (87)
The structural alignment of the muscular and skeletal systems that allows the body to maintain balance in relation to its center of gravity.
Coordinating proprioceptive movements for stability and balance.
Sedentary habits can… (87)
Create adverse effects on the nervous system. The nervous system can adapt to inactivity such as being in seated positions at work and home for multiple hours a day
Neurons (87)
The functional unit of the nervous system
Aprox. 100 billion specialized nerve cells
What parts does a neuron have? (87)
Cell body, axon, and dendrites.
Dendrite (88)
The portion of the neuron that is responsible for gathering information from other structures.
They act as extensions from the cell body, feeling for impulses from other neurons or sensory receptors.
Cell body AKA Soma (87-88)
Processes the information from the dendrite and sends it along to the axon.
The portion of the neuron that contains the nucleus, lysosomes, mitochondria, and golgi complex.
Axon
Conducts electrical impulses away from the cell body.
A cylindrical projection from the cell body that transmits nerve impulses to other neurons or effector sites.
Nerve impulses (87)
The consecutive linking of neurons by electrochemical signals that travel throughout the nerve fiber.
Afferent Neurons (87)
AKA sensory neurons. These are nerve impulses that move TOWARD the spinal cord and brain from the periphery of the body and are sensory in nature.
What are examples of sensory receptors? (87-88)
mechanoreceptors, thermoreceptors, nociceptors, chemorecptors, and photoreceptors.
Efferent Neurons (88)
Nerve impulses that move AWAY from the brain and spinal cord.
They conduct impulses for muscles to contract, which is why they are known as motor neurons.
Interneurons (88)
Only located within the spinal cord and brain; receives impulses from afferent (sensory) neurons and conduct back out to provide a motor (efferent) response.
Mechanoreceptors (88)
Sensory receptors responsible for sensing distortion in body tissues.
Proprioceptors (88)
Aka body positioning receptors
Muscle spindles (88)
Are small mechanoreceptors found in the belly of skeletal muscles that measure the amount and rate of a stretch.
Proprioception (88)
Refers to the cumulative sensory input to the CNS from all the mechanoreceptors that sense body position and limb movement.
This type of mechanoreceptor activates a protective mechanism when a muscle is being lengthened too much or too quickly. This happens during a static stretch or flexibility routine. (88)
Muscle spindles
When a muscles is stretched to the point where the spindles deem dangerous, they contract, disallowing any movement that goes further into the stretch.
GTOs Golgi Tendon Organ (88)
Measures the amount and rate of tension that develops within the muscle.
Located at the musculotendinous junction, which is where the muscle and tendon converge.
What happens if the GTO experiences the onset of tension to be too rapid or too much? (88)
The GTO will cause the muscle to relax as a safety response.
As the GTO monitors the muscular contraction, approximately how long does it take for the GTO to send a signal instructing the muscle to be in a relaxed state?
Approximately 30 seconds
Joint receptors (88)
Receptors in and around a joint that respond to pressure, acceleration, and deceleration of the joint.
What are proprioceptors classified as, their location, and what do they fundamentally perform? (88)
AKA mechanoreceptors, they are located in skeletal muscle, joint capsules, tendons, and provide information about body positioning.
What does deformation simply refer to? (88)
A change in position of the receptor, which generates a nerve impulse.
The muscular system is composed of these three types of muscles… (89)
Smooth, cardiac, and skeletal.
Which type of muscle in muscular system is voluntary and which are involuntary?
Smooth and cardiac are involuntary and skeletal is voluntary (consciously controlled)
What are the two major muscle fiber types?
Type I and Type II
Type I muscle fiber types are also known as?
Slow-twitch fibers or red fibers
These are small blood vessels where the exchange of oxygen and carbon dioxide takes place (89)
Capillaries
Nicknamed the “powerhouse of the cell,” this is where food energy is converted into energy the cells can use. (89)
Mitochondria
Myoglobin (89)
A red-colored protein in the fluid of muscle cells that pulls in oxygen and temporarily holds it.
Myoglobin contains a red pigment, which is why type I muscle fibers are considered red fibers.
Type I fibers
Aka slow-twitch or red fibers
They contain a large number of capillaries, mitochondira, and myoglobin.
Are considered to be highly aerobic
Type I fibers are advantageous in the presence of oxygen (aerobic). This is because…
They have an excellent oxygen delivery system via the capillaries
Myoglobins ability to hold onto oxygen
The ability for mitochondria to metabolize in the presence of oxygen
Why are type I fibers more resistant to fatigue? (89)
Because of their slow-twitch speed and high aerobic capacity.
They are also smaller in size, produce less force, and do not respond as well to hypertrophy as type II fibers.
What are the characteristics of type II fibers?
They contain fewer capillaries, mitochondira, and myoglobin.
Lack red-pigmentation normally seen in Type I fibers.
Considered to be more anaerobic with regard to their metabolic abilities.
They can produce more speed and strength than type I fibers , but the burst of intensity is short-lived.
Type IIa muscle fibers
Considered to be intermediate fast-twitch fibers.
Can utilize both aerobic and anaerobic metabolism almost equally to create energy.
Type II muscle fibers are subdivided into two groups, type IIa and IIx. Which of these subdivided muscle fibers utilize both anaerobic and aerobic metabolism in order to produce energy? (90)
Type IIa muscle fibers.
Behavioral properties of muscle (91)
Extensibility, elasticity, irritability, and the ability to develop tension.
Extensibility (91)
Refers to the ability to be stretched or lengthened
A client who lacks this type of behavioral property will be limited in their ability to lengthen a muscle. (91)
Extensibility
Elasticity (91)
Refers to a muscles ability to return to normal or resting length after it has been stretched.
Viscoelastic (91)
Ability to stretch linearly
Irritability (91)
Means that a muscle is able to respond to a stimulus
This stimulus can be an action potential coming from an attached nerve, or from the impact of an external force acting upon the muscle.
Contraction (91)
The activation of a force within a muscle to produce an action at a joint.
Agonist (92)
Muscles that works as the prime mover of a joint exercise. They are the major force producer for a particular joint action.
Synergists (92)
Muscles that assist the prime mover in a joint action.
Stabilizers (92)
Are muscles that minimize unwanted ancillary movements. This assists the agonist and synergists muscles to provide movement at the joint.
Antagonist (92)
Muscles that oppose the prime mover