Muscle Physiology Quiz

Cardiac muscle:

• Cells have no nuclei

• Is composed of cells that branch frequently

• Lines many hollow internal organs

• All of the above are correct

The term origin refers to:

• The attachment of a muscle to a bone that does not move when contraction occurs

• Attachment of a muscle to a bone that moves when contraction occurs

• The body of a muscle

• None of the above are correct

A sarcomere:

• Is the basic functional or contractile unit of skeletal muscle

• Contains only actin myofilaments

• Contains only myosin myofilaments

• Is found only in smooth or involuntary muscle

A motor unit consists of:

• Only a motor neuron

• A motor neuron and the muscle cells it innervates

• Only contracting muscle cells

• None of the above are correct

Which of the following types of muscle contraction does not produce movement?

• Isotonic contraction

• Tetanic contraction

• Twitch contraction

• Isometric contraction

Which of the following terms refers to moving a part away from the midline of the body?

• Abduction

• Adduction

• Supination

• Flexion

Many hollow internal organs and blood vessel walls contain _______ muscle.

The muscles that assist prime movers in producing a particular movement are called _______.

Skeletal muscle tone maintains _______ by counteracting the pull of gravity.

Depletion of oxygen in a muscle during vigorous and prolonged exercise is called _______.