Ch 8 anatomy

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 term that refers to ankle and foot movement is a. supination b. pronation c. dorsiflexion d. both a and b above

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 above

D

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 above

A

If you weigh 120 pounds, your skeletal muscles weigh about a. 50 pounds b. 60 pounds c. 70 pounds d. 40 pounds

A

Moving a part of the body toward the midline of the body is called a. adduction b. abduction c. rotation d. pronation

A

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 above

A

The basic contractile unit of a skeletal muscle is the a. sarcomere b. actin c. myosin d. Z lines

A

The minimal level of stimulation required to cause a fiber to contract is called a. a threshold stimulus b. the all-or-none law c. twitch contraction d. tetanic contraction

A

The muscle attachment to the more stationary bone is called the a. origin b. insertion c. tendon d. bursae

A

This is a 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

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

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

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

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

What part of the body does the deltoid move? a. Head and neck b. Upper extremities c. Trunk of the body d. Lower extremities

B

What part of the body does the pectoralis major move? a. Head and neck b. Upper extremities c. Trunk of the body d. Lower extremities

B

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

Which of the following muscles is not a muscle of the trunk? a. Rectus abdominis b. Iliopsoas c. Internal oblique d. External oblique

B

Which of the following muscles is not a muscle that moves the lower extremities? a. Sartorius b. Trapezius c. Iliopsoas d. Gracilis

B

A bursae is a saclike structure that is filled with a. blood b. synovial fluid c. blood plasma d. lymph

B

Another name for smooth muscle is a. cardiac muscle b. visceral muscle c. voluntary muscle d. skeletal muscle

B

Movement around a longitudinal axis is a. supination b. rotation c. dorsiflexion d. pronation

B

Moving a part of the body away from the midline of the body is called a. adduction b. abduction c. rotation d. pronation

B

The loose connective tissue outside the muscle organs that forms a flexible, sticky "packing material" between the muscles, bone, and skin is called a. microfilaments b. fascia c. fascicles d. tendons

B

The muscle attachment to the more movable bone is called the a. origin b. insertion c. tendon d. bursae

B

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

The thin myofilament of the skeletal muscles is made of a. sarcomere b. actin c. myosin d. Z lines

B

Another name for skeletal muscle is a. cardiac muscle b. visceral muscle c. voluntary muscle d. involuntary muscle

C

Endurance training leads to a. an increased number of myofilaments b. an increased number of muscle fibers c. an increased number of blood vessels to the muscle d. muscle atrophy

C

Groups of muscle fibers are called a. microfilaments b. fascia c. fascicles d. none of the above

C

If an injury caused damage to the insertion of the biceps brachii muscle (the anterior muscle of the upper arm), the injury would be nearest a. the shoulder b. the middle of the upper arm c. the elbow d. none of the above

C

Intercalated disks are found in a. smooth muscle b. skeletal muscle c. cardiac muscle d. voluntary muscle

C

Tension during muscle lengthening is often called a. isotonic contractions b. isometric contractions c. eccentric contractions d. antagonist contractions

C

The connective tissue that attaches muscle to bone is called a. origin b. insertion c. tendon d. bursae

C

The hand position when the body is in anatomical position is a. dorsiflexion b. pronation c. supination d. plantar flexion

C

The muscle contracts and shortens and the insertion end moves toward the point of origin. This sentence describes a. twitch contractions b. tetanic contractions c. isotonic contractions d. isometric contractions

C

The thick myofilament of the skeletal muscles is made of a. sarcomere b. actin c. myosin d. Z lines

C

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 above

C

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

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

C

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

Which of the following muscles is not a muscle of the head and neck? a. Frontal b. Masseter c. Latissimus dorsi d. Zygomaticus

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

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. adenosine triphosphate (ATP) must be broken down for energy d. all of the above

D

Striations are found in a. smooth muscle b. skeletal muscle c. cardiac muscle d. both b and c

D

The movement that is opposite dorsiflexion is a. supination b. pronation c. rotation d. plantar flexion

D

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. isotonic contractions d. isometric contractions

D

The opposite movement of rotation is a. flexion b. abduction c. pronation d. none of the above

D

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

What part of the body does the gastrocnemius move? a. Head and neck b. Upper extremities c. Trunk of the body d. Lower extremities

D

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

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

Which of the following muscles is not a muscle that moves the upper extremities? a. Biceps brachii b. Triceps brachii c. Latissimus dorsi d. Rectus abdominis

D

Which of the following systems do not play a role in body movement? a. Nervous system b. Respiratory system c. Circulatory system d. All of the above systems play a role in body movements

D