Chapter 7 Test
bursa
a fluid filled sac that acts lubricating structure for muscle movement a. origin b. insertion c. tendon d. bursa
motor unit
a single motor neuron with all the muscle cells it innervates is called a... a. motor unit b. neuromuscular junction c. neurotransmitter
all of the above
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
voluntary muscle
another name for skeletal muscle a. cardiac muscle b. visceral muscle c. voluntary muscle d. involuntary muscle
visceral muscle
another name for smooth muscle a. cardiac muscle b. voluntary muscle c. visceral muscle d. skeletal muscle
an increased number of blood vessels to the muscle
endurance training leads to... a. an increase in myofilaments b. an increased number of muscle fibers c. an increased number of blood vessels to the muscle
the elbow
if an injury caused damage to the insertion of the biceps brachii, the injury would be nearest... a. the shoulder b. the middle of the upper arm c. the elbow d. none of the above
cardiac muscles
intercalated disks are found in... a. smooth muscles b. skeletal muscles c. cardiac muscles d. voluntary muscles
rotation
movement around the longitudinal axis is...
an increased number of myofilaments
strength training leads to... a. an increased number of myofilaments b. an increased number of muscle fibers c. muscle atrophy
both b and c
striations are found in... a. smooth muscle b. skeletal muscle c. cardiac muscle d. both b and c
sarcomere
the basic contractile unit of skeletal muscle
tendons
the connective tissue that attaches muscle to bone
threshold stimulus
the minimal level of stimulation required to cause a fiber to contract a. threshold stimulus b. the all or none law c. twitch contractions d. tetantic contractions
plantar flexion
the movement that is opposite dorsiflexion is... a. supination b. pronation c. rotation d. plantar flexion
insertion
the muscle attachment to the more movable bone
origin
the muscle attachment to the more stationary bone
isotonic contractions
the muscle contracts and shortens and the insertion end moves toward the point of origin. this sentence describes... a. tetanic contractions b. isotonic contractions c. isometric contractions
neuromuscular junction
the point of contact between the nerve and the muscle fibers it stimulates is called... a. motor unit b. neuromuscular junction c. motor neuron d. neurotransmitter
dorsiflexion
the term that refers to ankle and foot movement a. supination b. pronation c. dorsiflexion
myosin
the thick myofilaments are made of...
actin
the thin myofilaments of skeletal muscle is made of... a. sarcomere b. actin c. myosin d. Z-Line
the prime mover and the synergist must contract
to produce smooth movement at a joint... a. the prime mover and antagonist must contract b. the antagonist and the synergist must contract c. the prime mover and the synergist must contract d. both a and b
both b and c
tonic contractions... a. move a muscle through a full range of motions b. not shorten the muscle c. are important in maintaining posture d. both b and c
the number of motor units used in the muscle
what allows you to lift different weights with the same muscle? a. the difference in the threshold stimulus b. the number of motor units used in the muscle c. the all or none law d. the isometric contraction of the muscle fibers
Z-lines are pulled together
when a muscle contraction occurs... a. actin gets shorter b. the miosin gets shorter c. Z-lines are pulled together d. both a and b
the all or none law
when a muscle fiber is subjected to a stimulus, it contracts completely. this is called...
latissimus dorsi
which of the following muscles is NOT a muscle of the head and neck? a. frontal b. masseter c. latissimus dorsi d. zygomatic
iliopsoas
which of the following muscles is NOT a muscle of the trunk? a. rectus abdominis b. iliopsoas c. internal oblique d. external oblique
rectus abdominis
which of the following muscles is NOT a muscle that moves an upper extremity? a. biceps brachii b. triceps brachii c. latissimus dorsi d. rectus abdominis
trapezius
which of the following muscles is NOT a muscle that moves the lower extremities? a. sartorius b. trapezius c. iliopsoas