Muscular System

Tetanus

It is a state of smooth and sustained contraction produced when the rate of stimulation is so high that muscle fibers cannot relax between stimuli.

Oxidative Fibers

This rely mostly on aerobic respiration to generate ATP.

mitochondria

Oxidative Fibers have many ___, a rich blood supply, and a large amount of myoglobin.

Myoglobin

It is a protein that binds oxygen more tightly than hemoglobin does.

skeletal muscle

In addition to ___, vertebrates have cardiac muscle and smooth muscle.

Cardiac Muscle

This found only in the heart, consists of striated cells electrically connected by intercalated disks.

action potentials

Cardiac Muscle can generate ___ without neural input.

Smooth Muscle

This is found mainly in walls of hollow organs such as those of the circulatory, digestive, and reproductive systems.

actin and myosin filaments

Smooth Muscle lacks striations, because the ___ are not regularly arrayed.

slow

In smooth muscle, contractions are ___ and may be caused by stimulation from neurons in the autonomic nervous system.

initiated

In smooth muscle, contractions may also be ___ by the muscles themselves.

motor neuron

In vertebrates, each ___ may synapse with multiple muscle fibers, although each fiber is controlled by only one motor neuron.

motor unit

A ___ consists of a single motor neuron and all the muscle fibers it controls.