PPT-Muscle Contraction and the Sliding Filament Theory

Learning Objective To be able to explain the sliding filament theory using appropriate terminology Structure of a Muscle Skeletal muscle is made up of bundles of muscle fibres Fibres are bound together by connective tissue through which run blood vessels and nerves. . Contraction of Skeletal Muscle. . (fasicle). A. Muscle . Fiber. 1. . sarcolemma. . * muscle cell membrane . . * extends into muscle fiber (forms . T-tubules. ) . 2. . sarcoplasmic reticulum. Types of Muscle. Skeletal – striated & voluntary. Smooth – involuntary. Cardiac - heart. The word “striated” means striped. Skeletal muscle appears striped under a microscope. . Muscles and Muscle Fiber. 11.2. Learning Objectives. Explain the sliding filament mechanism. State what evidence supports the sliding filament mechanism. Explain where the energy comes from for muscle contraction. Success Criteria. Learning Objective:. To . be able to explain the sliding filament theory . using key . terminology.. Structure of a Muscle. Skeletal muscle is made up of bundles of muscle . fibres. .. Fibres. are bound together by connective tissue through which run blood vessels and nerves.. By BB. “Contraction in Action” Muscle Contraction Skits. Anatomy & Physiology/Tissues, Bones and Muscles. Purpose: . To create a live model or skit of approximately 3 minutes to demonstrate muscle anatomy and the physiology of muscle contraction.. . & . Reflexes, . Proprioception. and Movement. PSK 4U Unit 4, Day 4. Excitation. -. Contraction . Coupling. Muscles work by converting electrical and chemical energy into mechanical energy!. The process of muscle contraction as a whole is often referred to as “excitation-contraction coupling”. Myofibrils composed of protein filaments:. Myosin. : thick filaments. Actin. : thin filaments. Muscle structure:. Muscle. Muscle fiber. Myofibril. Actin. Myosin. Muscle Structure. Sarcomere. :. the muscle . Figure 6.8. Contraction of a Skeletal Muscle. Muscle fiber contraction is “all or none”. Within a skeletal muscle, not all fibers may be stimulated during the same interval. Different combinations of muscle fiber contractions may give differing responses. I. Functions of Muscular Tissue. Like nervous tissue, muscles are excitable or "irritable”. they have the ability to respond to a stimulus. Unlike nerves, however, muscles are also:. Contractible. . At the heart of muscle function. Larry M. . Frolich. , Ph.D.. March 17,2011. HOOK. Muscle is only biological cell/tissue that can cause rapid, large-scale . movement—THE evolutionary innovation that defines . Muscle Contraction and the Sliding Filament Theory Learning Objective: To be able to explain the sliding filament theory using key terminology. Structure of a Muscle Skeletal muscle is made up of bundles of muscle Same principles apply to contraction of a single fiber and a whole muscle. Contraction produces tension, the force exerted on the load or object to be moved. Review Principles of Muscle Mechanics. Contraction does not always shorten a muscle:. Muscles and Muscle Fiber. Structure.     . Muscles are composed of many fibers that are arranged in bundles called FASCICLES. Individual muscles are separated by FASCIA, which also forms tendons. The Muscular System. Muscles are responsible for all types of body movement. Three basic muscle types are found in the body. Skeletal muscle. Cardiac muscle. Smooth muscle. Characteristics of Muscles.