The primary function of<unk>  is contraction. The three types of<unk>  (skeletal, cardiac and smooth) have significant differences. However, all three use the movement of actin against myosin to create contraction. Skeletal<unk>  In skeletal<unk> , contraction is stimulated by electrical impulses transmitted by the motor nerves. Cardiac and smooth<unk>  contractions are stimulated by internal pacemaker cells which regularly contract, and propagate contractions to other<unk>  cells they are in contact with. All skeletal<unk>  and many smooth<unk>  contractions are facilitated by the neurotransmitter acetylcholine. Smooth<unk>  Smooth<unk>  is found in almost all organ systems such as hollow organs including the stomach, and bladder; in tubular structures such as blood and lymph vessels, and bile ducts; in sphincters such as in the uterus, and the eye. In addition, it plays an important role in the ducts of exocrine glands. It fulfills various tasks such as sealing orifices (e.g. pylorus, uterine os) or the transport of the chyme through wavelike contractions of the intestinal tube. Smooth<unk>  cells contract more slowly than skeletal<unk>  cells, but they are stronger, more sustained and require less energy. Smooth<unk>  is also involuntary, unlike skeletal<unk> , which requires a stimulus. Cardiac<unk>  Cardiac<unk>  is the<unk>  of the heart. It is self-contracting, autonomically regulated and must continue to contract in a rhythmic fashion for the whole life of the organism. Hence it has special features.
Muscle tissue
Body fluid
Soft tissue
Skin
Fluid compartments
Heart
Biomedical tissue
Human body