Anatomy Chapter 8
if you weigh 120 pounds, your skeletal muscles weigh about: a. 50 pounds b. 60 pounds c. 70 pounds d. 40 pounds
a. 50 pounds
moving toward the midline of the body is called: a. adduction b. abduction c. rotation d. pronation
a. adduction
what part of the body does the masseter move: a. head and neck b. upper extremities c. trunk of the body d. lower extremities
a. head and neck
what part of the body does the sternocleidomastoid move: a. head and neck b. upper extremities c. trunk of the body d. lower extremities
a. head and neck
what part of the body does the zygomaticus move: a. head and neck b. upper extremities c. trunk of the body d. lower extremities
a. head and neck
strength training leads to: a. an increased number of myofilaments b. an increased number of muscle fibers c. muscle atrophy d. both a and b
a. in increased number of myofilaments
a single motor neuron with all the muscle cells it innervates is called a: a. motor unit b. neuromuscular junction c. neurotransmitter d. both b and c
a. motor unit
which does not move the lower extremities: a. sartorius b. trapezius c. iliopsoas d. gracilis
b. trapezius
according to the sliding filament model, in order for a sarcomere to contract: a. bridges must form between the actin and myosin b. calcium must be released from the endoplasmic reticulum c. ATP must be broken down for energy d. all of the above
d. all of the above
which does not play a role in body movement: a. nervous system b. respiratory system c. circulatory system d. all of the above play a role in body movement
d. all of the above play a role in body movement
the muscle attachment to the more stationary bone is called the: a. origin b. insertion c. tendon d. bursae
a. origin
the minimal level of stimulation required to cause a fiber to contract is called: a. threshold stimulus b. the all-or-none-law c. twitch contraction d. tetanic contraction
a. threshold stimulus
quick, jerky response to a stimulus seen in isolated muscles but is not important in normal muscle activity: a. twitch contraction b. tetanic contraction c. isometric contraction d. isotonic contraction
a. twitch contraction
moving a part of the body away from the midline of the body is called: a. adduction b. abduction c. rotation d. pronation
b. abduction
the thin myofilament of the skeletal muscles is made of: a. sarcomere b. actin c. myosin d. Z lines
b. actin
the muscle attachment to the more movable bone is called the: a. origin b. insertion c. tendon d. bursae
b. insertion
the point of contact between the nerve and the muscle fibers it stimulates is called a: a. motor unit b. neuromuscular junction c. motor neuron d. neurotransmitter
b. neuromuscular junction
what allows you to lift different weights with the same muscle is the a. difference in the threshold stimulus b. number of motor units used by the muscle c. all-or-none law d. isometric contraction of the muscle fibers
b. number of motor units used by the muscle
movement around a longitudinal axis is: a. supination b. rotation c. dorsiflexion d. pronation
b. rotation
a bursae is filled with: a. blood b. synovial fluid c. blood plasma d. lymph
b. synovial fluid
when a muscle fiber is subjected to a stimulus, it contracts completely. this is called: a. threshold stimulus b. the all-or-none law c. twitch contraction d. tetanic contraction
b. the all-or-none law
what part of the body does the deltoid move: a. head and neck b. upper extremeties c. trunk of the body d. lower extremities
b. upper extremities
another name for smooth muscle is: a. cardiac muscle b. visceral muscle c. voluntary muscle d. skeletal muscle
b. visceral muscle
ankle and foot movement is called: a. supination b. pronation c. dorsiflexion d. both a and b
c. dorsiflexion
tension during muscle lengthening is often called: a. isotonic contractions b. isometric contractions c. eccentric contractions d. antagonist contractions
c. eccentric contractions
if an injury caused damage to the insertion of the biceps brachii muscle, the injury would be nearest: a. the shoulder b. middle of the upper arm c. elbow d. none of the above
c. elbow
groups of muscle fibers are called: a. microfilaments b. fascia c. fascicles d. none of the above
c. fascicles
what part of the body does the pec major move: a. head and neck b. upper extremities c. trunk of the body d. lower extremities
b. upper extremities
endurance training leads to: a. increased number of myofilaments b. increased number of muscle fibers c. an increased number of blood vessels to the muscle d. muscle atrophy
c. increased number of blood vessels to the muscle
the muscle contracts and shortens and the insertion end moves toward the origin. this sentence describes: a. twitch contractions b. tetanic contractions c. isotonic contractions d. isometric contractions
c. isotonic contractions
which of the following muscles is not a muscle of the head and neck: a. frontal b. masseter c. latissimus dorsi d. zygomaticus
c. latissimus dorsi
the thick myofilament of the skeletal muscles is made of: a. sarcomere b. actin c. myosin d. Z lines
c. myosin
the hand position in anatomical position is: a. dorsiflexion b. pronation c. supination d. plantar flexion
c. supination
when a muscle contraction occurs: a. the actin gets shorter b. the myosin gets shorter c. the Z lines are pulled closer together d. both a and b
c. the Z lines are pulled closer together
if a prime mover flexes a joint: a. the synergist will extend the joint b. the synergist and antagonist will extend the joint c. the antagonist will extend the joint d. the antagonist will assist in flexing the joint
c. the antagonist will extend the joint
to produce smooth movement at a joint: a. the prime mover and antagonists must contract b. the antagonist and synergists must contract c. the prime mover and synergists must contract d. both a and b
c. the prime mover and synergists must contract
what part of the body does the external oblique move: a. head and neck b. upper extremities c. trunk of the body d. lower extremities
c. trunk of the body
another name for skeletal muscle is: a. cardiac muscle b. visceral muscle c. voluntary muscle d. involuntary muscle
c. voluntary muscle
when a muscle contraction occurs: a. the actin gets shorter b. the myosin gets shorter c. the Z lines are pulled closer together d. both a and b
d. both a and b
striations are found in: a. smooth muscle b. skeletal muscle c. cardiac muscle d. both b and c
d. both b and c
tonic contractions: a. move a muscle through a full range of motion b. do not shorten the muscle c. are important in maintaining posture d. both b and c
d. both b and c
a fluid-filled sac that acts as a lubricating structure for muscle movement is a(n): a. origin b. insertion c. tendon d. bursae
d. bursae
the muscle contracts but does not shorten, even though an increase in muscle tension does occur. this sentence describes: a. twitch contractions b. tetanic contractions c. isotinic contractions d. isometric contractions
d. isometric contractions
what part of the body does the biceps femoris move: a. head and neck b. upper extremities c. trunk of the body d. lower extremities
d. lower extremities
what part of the body does the rectus abdominis move: a. head and neck b. upper extremities c. trunk of the body d. lower extremities
d. lower extremities
what part of the body does the sartorius move: a. head and neck b. upper extremities c. trunk of the body d. lower extremities
d. lower extremities
the opposite of rotation is: a. flexion b. abduction c. pronation d. none of the above
d. none of the above
opposite of dorsiflexion is: a. supination b. pronation c. rotation d. plantar flexion
d. plantar flexion
which does not move the upper extremities: a. biceps brachii b. triceps brachii c. latissimus dorsi d. rectus abdominis
d. rectus abdominis
when calcium is released into the sarcomere: a. it attaches to the myosin heads b. acts as a crossbridge between actin and myosin c. stimulates an ATP molecule to release energy d. removes the blocking protein from the actin
d. removes the blocking protein from the actin