"sphincters" - 1 õppematerjal

Exercise Physiology - lecture 4 Blood, gas exchange, transport

contractile ­ ability to shorten forcibly irritability/excitability ­ ability to respond to a stimulus extensibility ­ ability to be stretched beyond resting length (stomach, heart etc. more so then skeletal) elasticity ­ ability to return to resting length  Functions of muscle tissue movement ­ all types posture ­ skeletal stabilizing joints ­ skeletal generating heat ­ skeletal (40% body mass), shivering regulating organ volume ­ smooth (sphincters)  Smooth muscle tissue Location ­ walls of tissues and organs, controlling the shape of lens in the eye Appearance ­ non-striated, layered, spindle shaped fibres Control ­ involuntary - neural and hormonal control, react to nearby cells  Smooth muscle tissue Function - various inc. to move food along digestive tract, to control the flow of blood, to focus our sight Fatigue ­ very resistant to fatigue Contraction ­ slow, wave like