IN CLASS NOTES = STEPS OF A MUSCLE CONTRACTION. STEP 1 Calcium ions present Ca+ binds to troponin which makes tropomyosin move out of way for myosin head.

Slides:

Advertisements

Similar presentations

Types of Muscle, structure and Function

Advertisements

Skeletal Muscle Activity: Contraction

Neuromuscular Junction

Sliding Filament Theory

Fig Myofibrils are surrounded by calcium- containing sarcoplasmic reticulum.

Sliding Filament Theory How do muscles work…... Muscle Cell Structure n Muscles are broken into smaller muscle fibers n muscle fibers are broken into.

The Organization of a Skeletal Muscle Figure 7-1.

Muscle Function.

CONTRACTION OF SKELETLAL MUSCLE: SLIDING FILAMENT THEORY

The Steps of Muscle Contraction: The Sliding Filament Theory

The Sliding Filament Theory. Steps to the Sliding Filament Theory 1.A message originates in the brain and is released to the central nervous system (CNS)

Muscles n Skeletal muscle organization and how it contracts.

Muscular system SKELETAL MUSCLE Skeletal muscle is made up of hundreds of muscle fibers –Fibers consists of threadlike myofibrils –Myofibrils composed.

Sliding Filament Theory Review

Sliding Filament Mechanism

Christina Nappi,, Valentina Clinton Rachel Phillips Ainslie Lee, Dominique Simpson Period 4,

Sliding Filament Theory

Physiology of Skeletal Muscle Contraction. The Muscle Action Potential ( AP ) The Muscle Action Potential ( AP ) Muscle RMP = -90 mV ( same as in nerves.

Warm-Up 4/8/15 1.What is an autoimmune disorder? 2.What how are LEMS and MG similar? 3.How are LEMS and MG different? Test - Tuesday.

Figure  _________ and_______filaments slide over each other______________the muscle length  Always requires ________ ions and ___.

09_10 Sliding filament theory Slide number: 1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Tropomyosin.

Chapter 9 Muscles and Muscle Tissue

Myofibrils are surrounded by calcium- containing sarcoplasmic reticulum.

Sliding Filament Theory

Myosin Myosin is a protein molecule found in the thick filaments. Myosin is a protein molecule found in the thick filaments.

Muscle Physiology.

Muscle Excitation – Contraction Coupling Chapter 16 KINE 3301 Biomechanics of Human Movement.

 Name the following movements: ◦ Increasing angle of joint (ex. Straightening arm) ◦ Moving around longitudinal axis: ◦ Moving a limb away from midline.

MUSCLE CONTRACTION. Microscopic Anatomy of Skeletal Muscle Sarcomere Contractile unit of a muscle fiber Figure 6.3b.

Muscles & Skeleton Locomotion Chapter 50. Muscle structure  Muscle fibers  Single cell with many nuclei  Each fiber has a bundle of myofibrils  Each.

Muscle Action Muscle cells are polarized, have charge Excess of Na+ ions in ECF Excess of K+ ions in ICF mixed with PO 4 -3 cause muscle fiber to have.

Interaction of thick & thin filaments __________________ –_____________________________________ _____________________________________ –_____________________________________.

Sliding Filament.

Synapse – The site of connection between a neuron and a cell. Neurotransmitter – A chemical released at the neuron’s synapse that communicates with the.

Muscle Physiology Dynamics of Muscle Contraction MMHS Anatomy.

The Sliding Filament Theory

Myosin heads cannot bind to actin filaments

Muscle Physiology – How does this thing work?

The Physiology of Skeletal Muscle Contraction

Figure 10.6 Levels of Functional Organization in Skeletal Muscle Fiber

Neuromuscular Junction and Major Events of Muscle Contraction Quiz Review.

Muscular System The 3 Types of Muscles SKELETAL MUSCLE STRUCTURE.

actin troponin actin troponin tropomyosin actin troponin tropomyosin.

The Muscular System. Review of Muscle Types Characteristics Excitability Contractibility Extensibility Elasticity.

Muscle Contraction. 1.Acetylcholine (Ach) is released from the axon terminal (nerve) into the synaptic cleft and binds to Ach receptors in the sarcolemma.

Sarcomere Physiology: Sliding Filament Theory This is pretty exciting!

Muscle Contraction.

Muscle Contractions. Muscles pull on tendon fibers Pull=Tension Tension is an active force Energy must be applied to produce an active force Applied tension.

How do muscle cells contract ?. What is the structure of a muscle fiber ? The sarcolemma, or plasma membrane contains invaginations called T (transverse)

Skeletal Muscle Lab. Three Muscle Types Parts of the Muscle Fiber.

HOW DO MUSCLES CONTRACT?

Muscle Fiber Contraction

Muscle contraction.

Sliding Filament Theory

Initially Sarcolemma is in the Resting Membrane state

Molecular mechanism of muscle contraction

Comparative Vertebrate Physiology

The sliding filament theory

Muscular System Notes Unit 6.

Key diagrams, animations and quizzes

Rigor is a transient state.

A skeletal muscle is composed of a variety of tissues

NOTES: The Muscular System (Ch 8, part 2)

The sliding filament theory

Shortening of sarcomeres = muscle shortening

NOTES: The Muscular System (Ch 8, part 3)

Excitation-Contraction Coupling 1. Impulse arrives from motor neuron 2. Neuron releases acetylcholine (Ach) into synapse with muscle 3.

Contraction II Department of Biology, WCU.

Sliding Filament Theory

Actin. actin troponin actin tropomyosin troponin actin.

Presentation transcript:

IN CLASS NOTES = STEPS OF A MUSCLE CONTRACTION

STEP 1 Calcium ions present Ca+ binds to troponin which makes tropomyosin move out of way for myosin head to attach

STEP 2 Cross-bridge attaches. ATP breakdown provides energy to ready the myosin head for a power stroke Myosin head attaches to exposed binding site on actin and the power stroke is accomplished

STEP 3 Cross-bridge (myosin head) springs from raised position and pulls on the actin filament.

STEP 4 Cross bridges break  ATP binds to cross-bridge (but is not yet broken down)  Myosin heads are released from actin

STEP 5 As long as calcium ions and ATP are present, this walking continues until the muscle fiber is fully contracted