A&P Muscular System
Which of these pathways to regenerate ATP during muscle activity is the fastest
) anaerobic glycolysis and lactic acid formation
During skeletal muscle contraction, myosin cross bridges attach to active sites of
actin filaments
A muscle twitch results when the muscle is stimulated so rapidly that no evidence of relaxation is seen.
FALSE
A prime mover of the arm that acts in adduction is the deltoid.
FALSE
An aponeurosis is a ropelike piece of muscle fascia that forms indirect connections to muscles of the leg.
FALSE
Cardiac muscle fibers are relatively short, tapering cells within a single centrally located nucleus
FALSE
Dorsiflexion and plantar flexion are synergistic actions
FALSE
Lactic acid results from aerobic respiration
FALSE
Plantar flexion at the ankle joint is accomplished by the tibialis anterior muscle.
FALSE
Skeletal muscle is considered involuntary because it is the only type of muscle usually subject to conscious control.
FALSE
Supination and pronation refer to up and down movements of the foot at the ankle.
FALSE
The epimysium covers individual muscle fibers
FALSE
The insertion of the biceps brachii muscle is on the radius.
FALSE
There are 206 skeletal muscles in the human body
FALSE
Thick filaments are made of a protein called actin
FALSE
A contraction in which a skeletal muscle does not shorten but its tension increases is called isometric
TRUE
A nerve cell and all the muscle cells that it stimulates are referred to as a motor unit.
TRUE
A sustained partial contraction of skeletal muscle is called muscle tone
TRUE
One of the important functions of skeletal muscle is to generate heat
TRUE
Skeletal muscles need nerve stimulation for contraction to occur
TRUE
The bicpes brachii muscle is named for the two heads that orginiate from the shoulder girdle.
TRUE
The deepest muscle of the abdominal wall is the transversus abdominis.
TRUE
The neurotransmitter used by the nervous system to activate skeletal muscle cells is acetylcholine
TRUE
When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands move closer together but do not diminish in length.
TRUE
While doing "jumping jacks" during an exercise class, your arms and legs move laterally away from the midline of your body. This motion is called
abduction
Which of these events must occur first to trigger the skeletal muscle to generate an action potential and contract
acetylcholine (ACh) causes temporary permeability to sodium
Neurotransmitters are released upon stimulation from a nerve impulse by the
axon terminals of the motor neuron
A nursing infant develops a powerful sucking muscle that adults also use for whistling or blowing a trumpet called the
buccinator
The insertion of the gluteus maximus is the
femur
Which of the following muscles is not involved in dorsiflexion and/or plantar flexion of the foo
iliopsoas
Paralysis of which of the following would make an individual unable to flex the thigh
iliopsoas and rectus femoris
The condition of skeletal muscle fatigue can be best explained by
insufficient intracellular quantities of ATP due to excessive consumption
Which one of the following does NOT compress the abdomen
latissimus dorsi
What is NOT a criteria generally used in naming muscles
method of attachment of the muscle to bone
Anaerobic glycolysis occurs without
oxygen
A muscle located on the ventral (anterior) side of the body is the
pectoralis major
Which one of the following muscle actions would NOT be classified as an ISOTONIC contraction
pushing against a stationary wall
The major function of the sarcoplasmic reticulum in skeletal muscle contraction is to
regulate intracellular calcium concentration
An elaborate and specialized network of membranes in skeletal muscle cells that function in calcium storage is the
sarcoplasmic reticulum
Creatine phosphate (CP) functions within the muscle cells by
storing energy that will be transferred to ADP to resynthesize ATP as needed
Which of these muscles is not responsibile for flexion or extension of the arm?
A) biceps brachii B) triceps brachii C) brachialis D) platysma E) latissimus dorsi Answer: D
Which of the following muscles are antagonists
A) biceps brachii and triceps brachii B) bicpes femoris and biceps brachii C) vastus medialis and vastus lateralis D) masseter and temporalis E) gastrocnemius and soleus Answer: A
Which one of the following muscles is involved in abduction of the arm at the shoulder joint
A) deltoid B) biceps brachii C) triceps brachii D) latissimus dorsi E) pectoralis major Answer: A
Paralysis of which of the following would make an individual unable to flex the knee:
A) hamstring muscle group B) gluteal muscle group C) gastrocnemius D) sartorius E) iliopsoas Answer: A
Which of the following muscles adducts the thigh
A) peroneus muscles B) gluteus maximus C) sartorius D) quadriceps group E) adductor muscles Answer: E
The gap between the axon terminal of a motor neuron and the sarcolemma of a skeletal muscle cell is called the
synaptic cleft
A muscle group that works with and assists the action of a prime mover is a(n):
synergist only
The striations that give skeletal muscle its characteristic striped appearance are produced, for the most part, by
the arrangement of myofilaments
Which of the following muscles closes the jaw
the masseter and the temporalis
A skeletal muscle twitch differs from a tetanic contraction in that
the muscle twitch is a brief and "jerky" movement, while the tetanic contraction is prolonged and continuous
Which one of the following is the action of the orbicularis oris
closes, purses, and protrudes the lips
Sandra is playing the piano for her recital. Which muscle is not involved in the movement of her hands and/or fingers
extensor digitorum longus
Which of the following muscles inserts on the calcaneus
the soleus