Cell body Supporting cells
■ Figure 1.10 A photomicrograph of nerve tissue. A single neuron and numerous smaller supporting cells can be seen.
bronchioles (small air passages in the lungs), and in the ducts of the urinary and reproductive systems. Circular arrangements of smooth muscle in these organs produce constriction of the lumen (cavity) when the muscle cells contract. The digestive tract also contains longitudinally arranged layers of smooth muscle. The series of wavelike contractions of circular and longitudinal layers of muscle known as peristalsis pushes food from one end of the digestive tract to the other.
The three types of muscle tissue are discussed further in chapter 12.
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