BSC 109 Lecture Notes - Lecture 18: Skeletal Muscle, Neuromuscular Junction, Smooth Muscle Tissue

• School: University of Alabama
• Department: Biological Sciences
• Course: BSC 109
• Professor: Austin R.Hicks

Document Summary

Always view the powerpoints the instructor has uploaded to blackboard for the images that go along with the notes. Muscle tissue is found in every organ. Muscles participate in every activity that requires movement. Large portion of body weight is muscle. Skeletal muscle: attaches to skeleton and provides strength and mobility. Smooth muscle: walls of digestive tract, blood vessels, uterus, ureters. Voluntary: conscious control over movement (picking up a pen) Involuntary: unconscious control over movement (beating of heart) Excitable: contract in response to electrical or chemical stimuli. All muscle cells have one mechanism of action: Synergistic muscles: work together to create the same movement. Antagonistic muscles: muscles that oppose each other. Many muscles attach to bones via tendons. Origin: end of muscle that attaches to relatively stationary bone. Insertion: end of muscle attached to another bone across a joint, action pulls insertion toward origin. A muscle is composed of many muscle cells.