Describe the location, function and characteristics of three types of muscles in mammalian body.

a)Skeletal/ striated muscles;
-They are located/attached to the bones/skeleton;
-They contract bringing about movement of limbs;
-Composed of long fibres and each fibre is composed of numerous myofibrils that have multiple nuclei (it is multinucleated);
-They are cylindrical in shape;
-The fibres are striated/ have striations;
-Contraction is controlled by voluntary nervous system;
-The muscle contracts faster and fatigue quickly/ easily;
-The fibres contract antagonistically creating a force that is transmitted to the skeleton by tendon to bring about movement of limbs;
b)Smooth muscles;
-They are found along the walls of tubular internal/ visceral organs (e.g. trachea, ureter, urethra, blood vessels, alimentary canal/ gut, reproductive tract, blood vessels), ciliary body, iris of the eye and erector pili muscle;
-They bring about peristaltic movement of food materials, blood and body fluids;
-They consist of short fibres;
-Each fibre has one/ single nucleus (uninucleated);
-They are not striated/are unstriated/ lack striations;
-They are spindle shaped;
-Contraction is controlled by involuntary nervous system;
-They contract slowly and do not fatigue easily;
c)Cardiac muscle;
-It is found on the heart;
-Its contraction and relaxation brings about the heartbeat;
-It has branched fibres which are striated but with intercalated discs;
-Each muscle fibre consists of short cells with a single/ one nucleus (uninucleated);
-It contracts continuously without fatigue;
-It is myogenic i.e. contraction originates from within itself without nervous/ hormonal stimulation;
-Its contraction is controlled by autonomic/ involuntary nervous system;