Muscle tissue.

There are three types of muscle tissue:

  1. Voluntary or striated muscle. This is under conscious control.

  2. Cardiac muscle. This is the muscle of the heart

  3. Involuntary or unstriated muscle. This is not under conscious control. It is responsible for moving food through your intestine and blood through your arteries.

1. Voluntary muscle

Voluntary muscle consists of numbers of fibrils. Groups of fibrils are joined together to form muscle fibres which, in turn, are grouped together to form the muscle.
Under the microscope the fibrils can be seen to consist of a series of bands or striations. These are actually bands of the proteins actin and myosin. These proteins are responsible for muscle contraction.