Exam 9: Muscular System

A forceful, sustained muscle contraction is called a(n)________ contraction.

Smooth muscle lacks

A mutation affecting cytokine development, particularly the interleukin-6 cytokine, will affect

The combining of a series of twitches to produce a more forceful contraction is called ________.

Compared to skeletal muscle, smooth muscle

The more movable end of a muscle is its

A muscle fiber exposed to a series of stimuli of increasing frequency combines individual twitches (summation)which results in

Transverse tubules

Both acetylcholine and norepinephrine can affect

Knowing the relationship between the main action of the rectus femoris muscle and the vastus lateralis muscle, they can be described as ________.

A motor unit is

The ________ at the ends of cardiac muscle cells help to join cells.

After carrying a heavy box, you put it down by lowering it with your arms. Your biceps brachii muscles are contracting, but not forcefully enough to shorten and lift the box back up. This type of contraction is specifically called a(n)________ contraction.

A sarcomere is best described as

A broad sheet of dense connective tissue that attaches the coverings of adjacent muscles is called a(n)________.

Skeletal muscles help maintain body temperature in that

The pigment responsible for the reddish brown color of skeletal muscle is ________.

Myasthenia gravis is

In order to stimulate skeletal muscle fibers, motor neurons release the neurotransmitter ________.

Athletes usually experience muscle fatigue less quickly than nonathletes because they