21 October 2009 This Week in Physiology:

Slides:

Advertisements

Similar presentations

Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings Twitch time course Duration of twitch is largely governed by rate of sequestration.

Advertisements

Muscle Specialized for: Types:.

Fig Myofibrils are surrounded by calcium- containing sarcoplasmic reticulum.

The Organization of a Skeletal Muscle Figure 7-1.

Today –Role of calcium –Muscle fiber membrane potential & contraction –Neural control of muscle.

Muscles n Skeletal muscle organization and how it contracts.

Muscle Physiology. Outline: Skeletal Muscle 1)Somatic Motor pathways 2)Neuromuscular junction (synapse) 3)Excitation of muscle cells 4)Contraction of.

Myofibrils are surrounded by calcium- containing sarcoplasmic reticulum.

Skeletal Muscle Mechanics Dr.Mohammed Sharique Ahmed Quadri Assistant Professor Department Basic Medical Sciences Division of Physiology Faculty of Medicine.

Muscle Physiology Chapter 7.

Fiber Types Twitch durations vary from 10 to 200 msecs. This variation

Muscle Physiology Lab #9.

Skeletal Muscle Physiology How do contractions occur? Remember that muscles are excitable.

20 October 2010 This Week in Physiology: Lab: Sensory Physiology & Visual System Lectures: Ch. 9 Muscle Physiology Next Week in Physiology: Lab: Frog muscle.

Muscle physiology. homeostasis skeletal muscles contribute to homeostasis by playing a major role in the procurement of food, breathing,heat generation.

Topics –Role of calcium –Muscle fiber membrane potential & contraction –Neural control of muscle & reflexes –Whole muscle physiology.

Neuromuscular transmission Motor Unit Motor Unit :Motor Unit : is the motor neuron and all the muscle fibers it supplies all of these fibers will have.

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.

Flash Cards Chapter

15 & 17 October 2008 Muscle Physiology –Properties of individual twitching myofibers –Fiber types –Motor units and whole muscle composition –Fatigue –Recruitment.

Muscle II. Mechanics Fiber Contraction.. Tension: Force exerted by a contracting muscle on an object. Load: Force exerted on the muscle by the weight.

PHYSIOLOGY 1 LECTURE 17 SKELETAL MUSCLE MECHANICS.

Chapter 6 Contraction of Skeletal Muscle Dr. Marko Ljubković Department of Physiology.

Skeletal Muscle Mechanics Dr.Mohammed Sharique Ahmed Quadri Assistant Professor Department Basic Medical Sciences Division of Physiology Faculty of Medicine.

Characteristics: Location, cell shape, nuclei per cell, innervation, connections to adjacent myofibers, arrangement of actin and myosin, regulation of.

PHYSIOLOGY 1 LECTURE 22 SKELETAL MUSCLE MECHANICS.

Chapter 38: Protection, Support, Movement: Skin, Skeleton, and Muscle.

A change in resting membrane potential corresponds to a change in (a) Charge flowing across the membrane (b) Charge stored on membrane capacitor.

Neuromuscular transmission

Skeletal Muscle Physiology How do contractions occur? Remember that muscles are excitable.

Comparative Vertebrate Physiology

Skeletal Muscle Mechanics Dr.Mohammed Sharique Ahmed Quadri Assistant Professor Department Basic Medical Sciences Division of Physiology Faculty of Medicine.

Neuromuscular transmission. Synaptic transmission *** Synapse is the junction between two neurones where electrical activity of one neurone is transmitted.

Figure Ball-and-socket joint Head of humerus Scapula Hinge joint Humerus Ulna Radius Pivot joint.

Sliding Filament.

Muscle Physiology – How does this thing work?

26 October 2009 This Week in Physiology: Wednesday Quiz: 1 Question based on Today’s Lecture Lab: Muscle Physiology #1 Lectures: Ch. 9 Muscle Physiology.

24 October 2011 This Week in Physiology: Lab: Frog Muscle Physiology Lectures: Ch. 9 Muscle Physiology Ch. 10 Control of Body Movement Next Week in Physiology:

Lecture #21 Date ____ n Chapter 49 ~ Sensory and Motor Mechanisms.

Molecular Basis of Muscle Contraction Standard 9 h. Students know the cellular and molecular basis of muscle ocntraction,including the roles of actin,

Figure The Contraction Cycle Figure Figure The Contraction Cycle Figure

Regulation of Contraction I. How do nerves stimulate muscle contraction? II. Factors influencing muscle tension III. How does contraction of smooth/cardiac.

PHYSIOLOGY 1 LECTURE 19 SKELETAL MUSCLE MECHANICS.

Chapter Opener 9.

QOD 3/21/17 Chapter 7: Muscle Tissue

Muscles and Muscle Tissue

Physiology of skeletal muscle contraction – events at the myofilaments

Muscle physiology.

Initially Sarcolemma is in the Resting Membrane state

Muscle Physiology – How does this thing work?

The Sliding Filament Theory

Finish Readings in Ch 7 Sensory Physiology

1 C H A P T E R Muscle Physiology.

Chapter 9: Muscle physiology

SPORT MED 20L Mr. Giesbrecht

26 October 2010 This Week in Physiology: Lab: Frog Muscle Physiology

25 October 2010 This Week in Physiology: Lab: Frog Muscle Twitches

Muscle Contraction.

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

19 October 2009 This Week in Physiology:

Chapter 49: Sensory and Motor Mechanism

Skeletal muscle physiology

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

See Website for Details

19 October 2011 This Week in Physiology: Lab: Visual System Part 2,

Define key terms: Motor unit, summation, all or none law

Skeletal muscle contraction

Lab 6: Muscle Physiology

Do now activity #1 What are the 3 types of muscle?

Presentation transcript:

21 October 2009 This Week in Physiology: Wednesday Quiz: Cranial Nerves Lab: Sensory Physiology & Auditory System Lectures: Ch. 9 Muscle Physiology Starting Wednesday after Fall Break: 1 Question Quiz each class meeting based on the previous lecture.

Energy for powerstroke & Necessary for detaching myosin from actin Fig. 09.08 2 roles of ATP: Energy for powerstroke & Necessary for detaching myosin from actin Crossbridge cycling continues as long as ATP and Ca++ present. 09.08.jpg

YouTube Videos Role of ATP in muscle Creepy Muscle demo Sarcomere contraction Powerstoke in muscle I Powerstroke in muscle II 09.09.jpg

Muscle kinetics Link to cytosolic calcium concentration, release, and reuptake? 09.10.jpg

Fig. 09.16 09.16.jpg

Fig. 09.19a Twitch Twitch Twitch 09.19a.jpg

Fig. 09.19b Summation 09.19b.jpg Tension is a result of the temporal control of cytosolic calcium concentration

Fig. 09.19c 09.19c.jpg

Fig. 09.20 Why does this plateau? 09.20.jpg So….. Tension produced by a single myofiber varies depending on frequency of Action Potentials.

Length-tension Relationship 09.21.jpg So….. Tension produced by a single myofiber varies depending on sarcomere length.

So what are the ways a muscle (consisting of many myofibers) increases tension (force)?

Fig. 09.13 Motor unit = a single somatic motor neuron and all the muscle fibers in innervates 09.13.jpg

Increasing tension in a whole muscle Frequency of stimulation of motor neuron Activate larger motor units Recruitment: activate more motor units These factors influence actual tension Fiber length (length-tension) relationship Fiber diameter Level of fatigue (state of activity)