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Structure and Function Chapter 8
Structure and Function of the Body
113
Medical
Undergraduate 1
09/30/2016

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Term
If you weigh 120 pounds, how much is muscle?
Definition
about 50 pounds
Term
Characteristics of Skeletal cells
Definition
microscopic, threadlike, cylindrical cells with many crosswise stripes and multiple nuclei
Term
muscle fiber
Definition
fine thread of muscle cells
Term
skeletal muscle
Definition
attaches to the bone
Term
Three types of muscle tissue
Definition
Skeletal- attached to bone
Striated- has cross stripes(striations)
Voluntary- can be controlled voluntarily.
Term
Cardiac muscles
Definition
Compose bulk of the heart. cylindrical and branch frequently. have striations and dark bands (intercalated disks)
Term
Smooth Muscles
Definition
Tapered at the end. have single nucleus. no striations. They are involuntary.
Term
Visceral Muscle
Definition
Smooth muscle that makes up much of the blood vessel walls and many of the hollow internal organs
Term
Three types of muscle fibers
Definition
skeletal, cardiac, and smooth
Term
Minimum number of bones a skeletal bone must connect to
Definition
Two
Term
Mostly stationary bone that a muscle is connected to.
Definition
Origin
Term
Bone doing most of the movement that a muscle is attached to.
Definition
Insertion
Term
What anchors muscles to bones?
Definition
Tendons.
Term
Bursae
Definition
Small fluid filled sacs beneath some tendons and bones.
Term
Synovial Membrane
Definition
Membrane lining the bursa and secrete a slippery lubricant.
Term
Tendon sheaths
Definition
tube shaped structures that enclose some tendons. They are lined with synovial membrane.
Term
Thick Myofilaments.
Definition
long cylinder in muscle fiber made up of a protein called myosin.
Term
Thin Myofilaments
Definition
long cylinder in muscle fiber made up of a protein called actin.
Term
Sacomere
Definition
Basic functional unit of a skeletal muscle. consist of numerous thick and thin myofilaments.
Term
Three functions of muscles
Definition
Movement
Posture
Generate heat
Term
Eccentric contraction
Definition
Tension as a muscle lengthiness. ie lowering a bowling ball slowly to the floor.
Term
Voluntary movement
Definition
Smooth movement, free of jerks and tremors. It's the result of coordination between several skeletal muscles.
Term
Prime Mover
Definition
Muscle mainly responsible for producing movement
Term
Synergist muscles
Definition
Muscles playing a minor role in a certain movement
Term
Antagonistic muscles
Definition
muscles that relax as the prime mover and antagonist muscles contract.
Term
Name muscles and role in bending and straightening the forearm
Definition
Bicep brachii- Prime mover
Brachialis- Synergist
Triceps brachii- Antagonist
Term
Muscle tone
Definition
Continuous low-strength body contraction to help maintain body position. maintains posture
Term
Tonic concraction
Definition
Muscle tone
Term
hypotermia
Definition
decrease in body temperature below normal temps
Term
ATP
Definition
Provides the elegy used to contract a muscle.
Term
Fatigue
Definition
decrease in strength of a muscle due to repeated muscle stimulation without adequate periods of rest.
Term
Lactic acid
Definition
Produced when muscles run low of oxygen. May contribute to burning sensation during exercise.
Term
Oxygen debt
Definition
continued increase metabolism that must occur in a cell to remove excess lactic acid that accumulates during prolonged exercise
Term
Excess post-exercise oxygen consumption (EPOC)
Definition
Technical term for oxygen debt
Term
Motor nueron
Definition
muscle fiber stimulated by a nerve fiber
Term
Neuromuscular Junction (NMJ)
Definition
point of contact between the nerve ending and the muscle fiber
Term
neurotransmitters
Definition
released by motor neuron in response to a nervous impulse
Term
Motor unit
Definition
a single motor unit with the muscle fibers it innervates
Term
acetylchoride (ACh)
Definition
the type of neurotransmitter operating in each neuromuscular junction
Term
motor unit
Definition
a single motor neuron, with the muscle fibers it innervates
Term
threshold stimulus
Definition
the minimal level of stimulation required to cause a fiber to contract
Term
"all or none"
Definition
when stimulated, a muscle fiber will contract fully or not at all; whether a contraction occurs depends on whether the stimulus reaches the required threshold
Term
twitch contraction
Definition
quick, jerky response to a stimulus
Term
tetanic contaction
Definition
more sustained and steady response than a twitch
Term
tetanus
Definition
contractions "melt" together to produce a sustained contraction
Term
isotonic contraction
Definition
produces movement at a joint
Term
concentric contraction
Definition
the muscle shortens
Term
eccentric contraction
Definition
the muscle lengthens but still provides work
Term
isometric contraction
Definition
when the muscle contracts and no movement results
Term
disuse atrophy
Definition
muscles shrinking in mass during prolonged inactivity
Term
hypertrophy
Definition
an increase in muscle size often caused by exercise
Term
strength training
Definition
muscle hypertrophy can be enhanced by this; involves contracting muscles against heavy resistance
Term
endurance training, aerobic training
Definition
does not usually result in muscle hypertrophy; instead this type of of exercise increases a muscle's ability to sustain moderate exercise over a long period
Term
flexion
Definition
a movement that makes the angle between two bones at their joint smaller than it was at the beginning of the movement
Term
extension
Definition
movements are opposite of flexions
Term
abduction
Definition
moving a part away from the midline of the body, such as moving your arm out to the side
Term
adduction
Definition
means moving a part toward the midline of the body
Term
rotation
Definition
movement around a longitudinal axis
Term
circumduction
Definition
moves a part so that its distal end moves in a circle
Term
supination
Definition
to turn the palm of the hand up-ward; opposite of pronate
Term
pronation
Definition
to turn the palm downward
Term
dorsiflexion
Definition
angular movement when the top of the foot is elevated (brought toward the front of the leg) with the toes pointing upward
Term
plantar flexion
Definition
action of the bottom of the foot being directed downward; this motion allows a person to stand on his or her tiptoes
Term
inversion
Definition
foot movement that turns the ankle so that the sole faces inward toward the midline of the body
Term
eversion
Definition
foot movement that turns the ankle so that the sole faces out to the side
Term
tenosynovitis
Definition
inflammation of the tendon sheath
Term
carpal tunnel syndrome
Definition
muscle weakness, pain, and tingling in the radial side (thumb side) of the wrist, hand, and fingers - perhaps radiating to the forearms and shoulder; caused by compression of the median nerve within the carpal tunnel (a passage along the ventral concavity of the wrist)
Term
sternocleidomastoid
Definition
rotates and flexes head and neck
Term
trapezius
Definition
extends head and neck; moves or stabilizes scapula
Term
pectoralis major
Definition
flexes and helps adduct arm
Term
deltoid
Definition
abducts arm
Term
biceps brachii
Definition
flexes elbow
Term
triceps brachii
Definition
extends elbow
Term
external oblique
Definition
compresses abdomen
Term
rectus abdominis
Definition
flexes trunk
Term
frontal muscle
Definition
one of the muscles of facial expression; it moves the eyebrows and furrows the skin of the forehead
Term
adductor longus
Definition
adducts thigh
Term
gracilis
Definition
adducts thigh
Term
pectineus
Definition
adducts thigh
Term
semimembranosus
Definition
flexes knee
Term
semitendinosus
Definition
flexes knee
Term
biceps femoris
Definition
flexes knee
Term
rectus femoris
Definition
extends knee
Term
vastus lateralis, vastus intermedius, vastus medialis
Definition
extends knee
Term
grastrocnemius
Definition
plantar flexes ankle
Term
orbicularis oris
Definition
facial muscle that puckers the lips
Term
zygomaticus
Definition
muscle that elevates the corners of the mouth and lips; also known as the smiling muscle
Term
mastication
Definition
chewing
Term
sternocleidomastoid
Definition
"strap" muscle located on the anterior aspect of the neck
Term
trapezius
Definition
triangular muscle in the back that elevates the shoulder and extends the head backwards
Term
pectoralis major
Definition
major flexor of the arm
Term
latissimus dorsi
Definition
an extensor of the arm
Term
deltoid
Definition
triangular; for example, the deltoid muscle
Term
biceps brachii
Definition
the primary flexor of the forearm
Term
triceps brachii
Definition
extensor of the elbow
Term
external oblique
Definition
the outermost layer of the anterolateral abdominal wall
Term
internal oblique
Definition
the middle layer of the anterolateral abdominal wall
Term
transversus abdominis
Definition
the innermost layer of the anterolateral abdominal wall
Term
rectus abdominis
Definition
muscle that runs down the middle of the abdomen; protects the abdominal viscera and flexes the spinal column
Term
intercostal muscles
Definition
the respiratory muscles located between the ribs
Term
diaphragm
Definition
membrane or partition that separates one thing from another; the flat muscular sheet that separates the thorax and abdomen and is a major muscle of respiration
Term
iliopsoas
Definition
a flexor of the thigh and an important stabilizing muscle for posture
Term
muscle strain
Definition
overstretching or tearing skeletal muscle fibers resulting from overexertion or trauma
Term
sprain
Definition
an injury occuring in the area of a joint and a ligament is damaged
Term
myositis
Definition
any muscle inflammation, including that caused by a muscle strain
Term
gluteus maximus
Definition
major extensor of the thigh and also supports the torso in an erect postion
Term
adductor muscles
Definition
any of a group of muscles of the leg that originate on the pelvic bone and insert on the femur (along the inside thigh) and draw the leg toward the midline of the body (adduction
Term
hamstring muscles
Definition
any of the powerful flexors of the hip; the hamstring group is made up of the semimembranosus, semitendinosus, and biceps femoris muscles
Term
quadriceps femoris
Definition
extensor of the leg
Term
tibialis anterior
Definition
dorsiflexor of the foot
Term
gastrocnemius
Definition
superficial muscle of the calf of the leg, connected (along with the soleus muscle) to the calcaneus bone of the foot by way of the Achilles (calcaneal) tendon; it's action is to dorsiflex the foot, bending the toes upward
Term
fibularis group
Definition
leg muscles that plantar flexes and everts the foot; formerly called peroneous group
Term
peroneus group
Definition
any of a group of plantar flexors and evertors of the foot; the peroneus longus forms a support arch for the foot
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