A&P Chap 10: Muscular System
Skeletal muscle fibers can shorten to about _____ percent of their resting length when they contract.
70
The deltoid muscle can: A. raise the arm B. flex the arm C. adduct the arm D. abduct the arm
adduct the arm
A muscle that contracts to provide most of a desired movement is consider to be which of the following? A. Antagonist B. Synergist C. Agonist D. Fixator E. Effector
agonist
The quadriceps muscles include all of the following, except: A. biceps femoris B. rectus femoris C. vastus lateralis D. vastus medialis
biceps femoris
Flexes the forearm at the elbow:
brachioradialis
Which of the following is also known as a sphincter? A. Circular muscle B. Fascicle C. Temporalis D. Pennate muscle
circular muscle
Abducts the arm:
deltoid
Which of the following muscles abducts the arm and extends of flexes the humerus? A. Teres major B. Subscapularis C. Teres minor D. Deltoid E. Pectoralis major
deltoid
What is the main muscle involved in the act of inspiration? A. Diaphragm B. Stomach C. Larynx D. Trachea
diaphragm
Which of the following muscles is located in the torso? A. Pectoralis major B. External oblique C. Soleus D. Biceps
external oblique
A muscle that contracts to provide a desired movement is called an antagonist. A. True B. False
false
Contraction of the diaphragm decreases the size of the thoracic cavity. A. True B. Flase
false
Normally, dystrophin is a protein that helps muscles to develop during the embryonic period. A. True B. False
false
The distal joints of the fingers function only by extrinsic muscles. A. True B. False
false
The major abductor of all the arm muscles is the trapezoid. A. True B. False
false
The muscles that move the head originate from the appendicular skeleton. A. True B. False
false
Which of the following reaches peak twitch tension in 0.01 seconds or less after stimulation? A. Slow fibers B. Red muscles C. Fast fibers D. Intermediate fibers
fast fibers
The muscle that flexes the foot is the: A. quadriceps femoris B. gastrocnemius C. gluteus maximus D. gluteus medius
gastrocnemius
Which of the following muscles contains the calcaneal tendon? A. Tibialis anterior B. Vastus lateralis C. Gastrocnemius D. Biceps femoris
gastrocnemius
Which of the following muscles does NOT depress the hyoid bone and larynx? A. Geniohyoid B. Sternothyroid C. Sternohyoid D. Omohyoid
geniohyoid
The more movable end of a muscle is the: A. origin B. proximal end C. insertion D. distal end
insertion
The adductor magnus muscle is located in which portion of the body? A. Forearm B. Leg C. Neck D. Buttocks
leg
The muscles of mastication move the _____ at the temporomandibular joint.
mandible
The relatively immovable part to which one end of a skeletal muscle is fastened is known as the: A. insertion. B. flexion. C. fascicle. D. origin. E. extension.
origin
Which of the following is the most common type of skeletal muscle classification? A. Unipennate muscles B. Fusiform muscles C. Circular muscles D. Parallel muscles
parallel muscles
Pulls the arm anteriorly:
pectoralis major
The _____ is triangular or fan-shaped.
pectoralis major
Which of the following is a prime mover of arm flexion? A. Pectoralis major B. Latissimus dorsi C. Deltoid D. Sternocleidomastoid
pectoralis major
Which of the following is an example of a convergent muscle? A. Biceps brachii B. Orbicularis oris C. Pectoralis major D. Rectus femoris
pectoralis major
Which of the following muscles can extend the arm when doing push-ups? A. Deltoid B. Triceps brachii C. Biceps brachii D. Pectoralis major
pectoralis major
Examples of _____ muscles include the extensor digitorum, rectus femoris, and deltoid.
pennate
Which of the following is the longest muscle in the body? A. Sternocleidomastoid B. Adductor longus C. Sensory neurons D. Radialis longus
radialis longus
Which of the following muscles flexes and rotates the lumbar region of the vertebral column? A. External intercostals B. Diaphragm C. Erector spinate D. Rectus abdominis
rectus abdominus
After infancy and the toddler period, muscle tissue increases very ______ , peaking during adolescence.
slowly
Which of the following muscles rotates the neck? A. Spinalis cervicis B. Splenius cervicis C. Iliocostalis cervicis D. Longissimus captis E. Spinalis thoracis
splenius cervicis
Flexes the neck:
sternocleidomastoid
Which of the following flexes the neck? A. Trapezius B. Deltoid C. Pectoralis major D. Sternocleidomastoid
sternocleidomastoid
The sartorius muscle is located in the: A. chest B. thigh C. abdomen D. foot
thigh
Extension at elbow:
triceps brachii
The biceps brachii and the long head of the triceps brachii originate on the scapula. A. True B. False
true
The most important muscle of inspiration is the diaphragm. A. True B. False
true
The trapezius muscle rotates the scapula and raises the arm. A. True B. False
true
With aging, skeletal muscles become less elastic because of fibrosis. A. True B. False
true
