PHYL 141 Lecture Notes - Lecture 10: Dense Irregular Connective Tissue, University Of Manchester, Occipitalis Muscle

• School: UH, UH Manoa, UHM
• Department: Physiology
• Course: PHYL 141
• Professor: Rachel Lindsey

Document Summary

Ex: diaphragm contracts/relaxes without conscious control so that you don"t stop breathing. Involuntary control alternating contraction/relaxation is not under conscious control: some smooth muscle tissue (e. g. muscles that propel food through gi tract) has autorhythmicity, regulated by neurons part of autonomic (involuntary) division of nervous system. Summary of major features of three types of muscular tissue. Long, cylindrical fiber with many peripherally located nuclei; unbranched, striated. Branched cylindrical fiber with one centrally located nucleus; intercalated discs join neighboring fibers; striated. Fiber thickest in middle, tapered at each end & with one centrally positioned nucleus; not striated. Walls of hollow viscera, airways, blood vessels, iris & ciliary body of eye, arrector pili muscles of hair follicles. Very large (100 m 30 cm = 12 in) Acetylcholine & norepinephrine released by autonomic motor neurons several hormones. Gap junctions in visceral smooth muscle; none in multi-unit smooth muscle. Acetylcholine & norepinephrine released by autonomic motor neurons; several hormones; local chemical changes; stretching.