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