University:
Arizona State University
Course:
BIO 201 | Human Anatomy & Physiology I
Academic year:

2023
Views:

406

Pages:

3
Author:

ilikemyicons0y5

Functions of Skeletal Muscle 1. Move the body • Move bones, make facial expressions, speak, breathe, swallow 2. Maintain posture • Stabilize joints, maintain body position 3. Protect and support • Package internal organs and stabilize them 4. Regulate elimination of materials • Sphincters control passage of materials at orifices 5. Produce heat • Help maintain body temperature General Properties of Muscle • All muscles share four main characteristics: – Excitability: capacity of muscle to respond to a stimulus (from our nerves) – Conductivity: ability to send an electrical charge down the length of the cell membrane – Contractility: ability of a muscle to shorten with force – Extensibility: muscle can be stretched to its normal resting length and beyond to a limited degree – Elasticity: ability of muscle to recoil to original resting length after stretched Gross Anatomy of Skeletal Muscle • Each skeletal muscle is an organ – Multiple types of tissues working together: skeletal muscle fibers, connective tissue, blood vessels, and nerves • Muscle fibers bundled within a fascicle – A whole muscle contains many fascicles – A fascicle consists of many muscle fibers © Ed Reschke • Myo, mys, and sarco are prefixes for muscle 9-4