Ch. 7 Anatomy: Muscular System
the minimal level of stimulation required to cause a fiber to contract is called
a threshold stimulus
moving a part of the body away from the midline of the body
abduction
the thin myofilament of the skeletal system is made of
actin
moving a part of the body towards the midline of the body is called
adduction
endurance training leads to :
an increase in number of blood vessels to muscle
strength training leads to
an increased number of myofilaments
tonic contractions
do not shorten the muscle and are important in maintaining posture
the term that refers to the ankle and foot movement is
dorsiflexion
t/f: strength training results in an increase in the number of muscle fibers
false
t/f: tonic contractions provide rapid movement for skeletal muscles
false
t/f: twitch contractions play an important role in normal muscle activity
false
what part of the body does the masseter move
head and neck
what part of the body does the sternocleidomastoid move?
head and neck
what part of the body does the zygomaticus move
head and neck
which of the following muscles is not a muscle of the trunk
illipsoas
attachment at point to the bone that moves during muscle contraction
insertion
the muscle attachment to the more movable bone is called
insertion
muscle contraction in which the muscle tenses but does not shorten
isometric
the muscle contracts but does not shorten, even though an increase in muscle tension does occur.
isometric contraction
type of muscle contraction in which the muscle shortens and the joint moves
isotonic
the muscle contracts and shortens and the insertion end moves toward the point of origin. this describes
isotonic contractions
what part of the body does the sacrtorius move
lower extremeties
a single motor neuron with all the muscle cells it innervates is called a
motor unit
single motor neuron with all the muscle cells in innervates
motor unit.
the thick myofilament of the skeletal muscles is made of
myosin
the point of contact between the nerve and the muscle fibers it stimulates is called
neuromuscular junction
the muscle attachment to the more stationary bone is called the
origin
the movement that is opposite dorsiflexion is
plantar flexion
which of the following muscles is not a muscle that moves the upper extremities?
rectus abdominus
movement around a longitudinal axis is
rotation
the basic contractile unit of a skeletal muscle is
sacromere
striations are found in
skeletal and cardiac muscle
the hand position when the body is anatomical position
supination
the connective tissue that attaches muscle to bone is called
tendon
contractions that "melt" together to produce a sustained contraction
tetanic
when a muscle fiber is subjected to a stimulus, it contracts completely. this is called
the all-or-none law
if a prime move flexes a joint
the antagonist will extend the joint
if an injury caused damage to the insertion of biceps brachii muscle, the injury would be nearest:
the elbow
to produce smooth movement at a joint
the prime mover and synergists must contract
which of the following muscles is not a muscle that moves the lower extremities?
trapezius
t/f: Z-lines mark the ends of individual sacaromeres
true
t/f: in order for movement to take place, the antagonists must to the opposite of the prime mover
true
t/f:endurance training increases blood flow to a muscle
true
what part of the body does the external oblique move
trunk of the body
what part of the body does the rectus abdominis move
trunk of the body
what part of the body does the deltoid move
upper extremities
what part of the body does the pectoralis major move
upper extremities
another name for smooth muscle is
visceral mucsle
which of the following muscles is not a muscle of the head and neck
latissimus dorsi
what part of the body does the gastrocnemius ("dancer's muscle") move?
lower extremeities
