Anatomy - Muscle Structure Quiz
synaptic cleft
The gap between the axon terminal of a motor neuron and the sarcolemma of a skeletal muscle cell is called the ________.
metacarpal two
The insertion of the extensor carpi radialis longus muscle is on __________.
aerobic pathway
The method that regenerates the most ATP during muscle activity is ________.
sarcolemma
The plasma membrane of a skeletal muscle cell is called the ________.
origin
The point of muscle attachment to an immovable or less movable bone is known as the ________.
lateral
The trapezius muscle may be separated into all of the following groups, except __________.
all skeletal muscles
There are three types of muscle tissue. Which of the following is classified as part of the muscular system?
external oblique
Which of these muscles is named for the arrangement of its fascicles?
spinal accessory nerve
All fibers of the trapezius muscle are innervated by the __________.
radial nerve
All fibers of the triceps brachii are innervated by the __________.
attaches to fibers of another facial muscle
At its insertion (unlike at its origin), the buccinator muscle __________.
flex the leg at the knee
Both heads of the biceps femoris muscle __________.
Blood cell formation
Which of the following is not> a function of the muscular system?
amount of connective tissue in a muscle
Which of these increases as muscles age?
the contractile unit between two Z discs
A sarcomere is ________.
storing energy that will be transferred to ADP to resynthesize ATP as needed
Creatine phosphate (CP) functions within the muscle cells by ________.
isometric contraction
Leaning against an immovable wall while waiting for a bus is a type of ________.
motor unit
One neuron and all the skeletal muscles it stimulates is known as a ________.
intercalated discs
Which of these characteristics applies only to cardiac muscle tissue?
False
Smooth muscle cells produce movement of the body and generate heat.
inversion
The anterior tibialis muscle dorsiflexes the foot at the ankle and also assists in __________ of the foot.
posterior thigh
The biceps femoris is located in the __________.
compresses the cheeks
The buccinator muscle __________.
facial nerve
The buccinator muscle is innervated by the __________.
the inability of the muscle to contract even if it is being stimulated
The condition of skeletal muscle fatigue can be best explained by ________.
regularly use hand weights and practice leg lifts
What can older individuals do to increase muscle strength?
atrophy
What condition results if muscles are not used, such as when immobilized in a cast to heal a broken bone?
regular exercise
What is key to offsetting the effects of aging on the muscular system?
Neurotransmitter
What is released by axon terminals into the synaptic cleft to stimulate a muscle to contract?
directly regenerates ATP from ADP within a muscle cell
What is the function of creatine phosphate?
action potential
What is the unstoppable electrical current that travels down the length of the entire surface of a sarcolemma?
lactic acid
What metabolic waste accumulates in muscle with excessive exertion?
calcium
What mineral is released within muscle cells to trigger contraction?
synergist
What term refers to a muscle that aids another muscle by producing the same movement or reducing undesirable movements?
complete tetanus
What term refers to a smooth, sustained contraction?
cardiac muscle
What type of muscle tissue is both striated and involuntary?
limited or inadequate? lactic acid
Which chemical is produced during vigorous exercise when the supply of oxygen is
endomysium
Which layer of connective tissue surrounds each skeletal muscle fiber?
Anaerobic glycolysis
Which method of regenerating ATP during muscle contraction can produce lactic acid?
