Physiology 2130 Lecture Notes - Endoplasmic Reticulum, Sliding Filament Theory, Myofilament
Document Summary
Biological machines that utilize chemical energy from the breakdown and metabolism of food to perform useful work. The body contains over 600 different muscles. These muscles perform three principal functions: movement, heat production, body support and posture. A whole look at the structure of muscle: a breakdown of the structures follows: Whole muscles are made up of bundles of fasciculi. Each fascicle is made up of groups of muscle cells or fibers. Each muscle cell contains many bundles of myofibrils. Each myofibril contains thin and thick myofilaments. Thin myofilaments contain mostly the protein actin along with troponin. The interaction of thin and thick myofilaments results in muscle and tropomyosin. contraction: video: striated or skeletal muscle is attached to bone and makes movement possible. A muscle structural pattern is a series of increasingly smaller parallel units. Each fibre is an elongated cell with many nuclei. Within each fibre are myofibrils composed of thick and thin filaments made of protein.
