Skeletal Muscle (striated, voluntary)- This is always attached to the skeleton (think biceps, triceps etc.) and is under voluntary control via the motor neurones of the somatic nervous system. It is the most abundant and best understood type of muscle. It can be divided into fast twitch (white) and slow twitch (red).
Cardiac Muscle (Involuntary)- This is a special type of slow twitch (red) skeletal muscle, but it is not attached to the skeleton and not under voluntary control (think back to the control of Heart Rate)
Smooth Muscle (Involuntary)- This is found in the internal body organs such as the wall of the gut, the uterus, blood arteries and arterioles, the iris, ciliary body and glandular ducts. It is under involuntary control via the autonomic nervous system or hormones. Smooth muscle usually forms a ring which tightens when it contracts, so therefore doesn't need a skeleton to pull up against (Peristalsis of the Oesophagus, for example)
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