ANP 1105 Chapter Notes - Chapter 9: Endoplasmic Reticulum, Skeletal Muscle, T-Tubule

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Jacqueline Carnegie

Document Summary

Types of muscle tissue: skeletal and smooth muscle are elongated and therefore called muscle fibers. Cardiac muscle: only in the heart- cardiac, striated. Involuntary: pacemaker sets rate of contraction, contracts at steady rate, but neural input can increase heart rate. Smooth muscle: found in the walls of hollow visceral organs, ex: stomach and bladder, role: force fluids through internal channels, elongated, but non-striated. Movement: almost all bodily movement results from muscle contraction. Skeletal muscles are responsible for locomotion and manipulation. Cardiac muscle pumps blood through the body and smooth muscle found in the walls of blood vessels maintains blood pressure. Smooth muscles found in the organs also squeeze substances through the organ and along the tracts. Posture and position: skeletal muscles maintain posture constantly working against gravity. Accounts for 40% of the body"s mass, so accounts for the most heat generation. Skeletal muscles also protect fragile internal organs by enclosing them.