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?