muscle system

The type of muscle found in the walls of the digestive tract is

Heart muscle is also known as

The most abundant type of muscle in the body is a striated muscle, also known as

Muscles that work against each other are said to be

The submicroscopic filaments of a muscle cell are known as

The functional unit of muscle activity is known as the

The thick filaments in the central protion of hte sarcomere are composed of the protein

The thin filaments of a sarcomere are composed of the protein

The thin filaments of the sarcomere in a skeletal muscle fiber are anchored to the

The theory explaining the contraction of muscle fibers is called the

During muscle contractions, the thick filaments pull on the thin filaments attached to the Z lines and shorten the

The primary source of energy for muscle contraction is

Red muscle has oxygen stored in a red-pigmented molicule called

The continual contractions of muscle fibers require a supply of hte energy molecule

White muscle is so-named because it has little or no

White muscle is not able to store much

White muscle uses stored glycogen for energy, and it is sometimes called

When a muscle is at rest, myosin heads are prevented from binding to actin by a protein called

Muscles are triggered to contract following release of the neurotransmitter

The first ion utilized during muscle contraction is

Calcium ions are stored in muscle cells within infoldings of hte plasma membrane called

Following their release, calcium ions trigger muscle contractions by binding to the molecule

The binding of calcium to troponin causes a shift in the molecule

The shift of position of tropomyosin unmasks the sites on actin filaments that bind to the heads of

Muscle contractions come to an end when tropomyosin covers the myosin-binding sites on

Energy is used during muscle relaxation to move calcium ions into the sarcoplasmic reticulum and the

The state of continual muscle contraction following death is called

Muscle contracts after its threshold has been reached, and the response is called the

The variable response displayed by an entire muscle is known as the

The number of muscle fibers contracting in a muscle depends on the stimulation from

The contraction of a muscle fiber is known as a

All the muscle fibers stimulated by one motor neuron constitute a

The increasing number of twitches occurring with continued muscle stimulation is described as a

A state of sustained maximum contraction of a muscle is a phenomenon called

The condition in which a muscle is kept partially contracted over a long period of time is known as

When ATP is broken down in muscle cells, the two end products are phosphate groups and

One source for regenerating ATP is the high-energy molecule

in order for the most energy to be released from carbohydrate molecules in muscle cell metabolism, an essential gas is

when muscle is oxygen-depleted, the energy for muscle contraction is derived from an anaerobic process called

Extreme muscle fatigue is generally due to the buildup of an acid called

following strnuous activity, a person breathes deeply to repay an

much of the lactic acid produced during strenous activity is carried from the muscle cells for metabolism by the

where contractions of the skeletal muscles are fast, the contractions of smooth muscles are generally

smooth muscle is so-named because it contains no

the muscle cells between some smooth muscles are linked together by junctions known as

where skeletal muscles are voluntary muscles, the smooth muscles are

single-unit smooth muscle cells are interconnected by

cardiac muscle is striated, and it is liberally supplied by energy-yielding organelles called

the ends of cardiac muscle cells are connected to one another by gap junctions in

cardiac muscle is similar to smooth muscle because it is not under

smooth muscle may be found in the

the only location for cardiac muscle in the human body is in the

for every muscle that acts in one direction there is another muscle that is

the skeletal muscles of the body are under

the two proteins of the myofibrils are