Muscle physiology
This presentation is the property of its rightful owner.
Sponsored Links
1 / 45

Muscle Physiology PowerPoint PPT Presentation


  • 66 Views
  • Uploaded on
  • Presentation posted in: General

Muscle Physiology. Human Anatomy and Physiology II Oklahoma City Community College. Dennis Anderson. Muscle Tissue. Skeletal Muscle Cardiac Muscle Smooth Muscle. Skeletal Muscle. Long cylindrical cells Many nuclei per cell Striated Voluntary Rapid contractions. Cardiac Muscle.

Download Presentation

Muscle Physiology

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Muscle physiology

Muscle Physiology

Human Anatomy and Physiology II

Oklahoma City Community College

Dennis Anderson


Muscle tissue

Muscle Tissue

  • Skeletal Muscle

  • Cardiac Muscle

  • Smooth Muscle


Skeletal muscle

Skeletal Muscle

  • Long cylindrical cells

  • Many nuclei per cell

  • Striated

  • Voluntary

  • Rapid contractions


Cardiac muscle

Cardiac Muscle

  • Branching cells

  • One or two nuclei per cell

  • Striated

  • Involuntary

  • Medium speed contractions


Smooth muscle

Smooth Muscle

  • Fusiform cells

  • One nucleus per cell

  • Nonstriated

  • Involuntary

  • Slow, wave-like contractions


Microanatomy of skeletal muscle

Microanatomy of Skeletal Muscle


Muscle physiology

Z line

Z line


Muscle physiology

H Band


Sarcomere relaxed

Sarcomere Relaxed


Sarcomere partially contracted

Sarcomere Partially Contracted


Sarcomere completely contracted

Sarcomere Completely Contracted


Muscle physiology

Tropomyosin

Binding Site

Troponin


Muscle physiology

Myosin


Neuromuscular junction

Neuromuscular Junction


Acetylcholine opens na channel

Acetylcholine Opens Na+ Channel


Muscle contraction summary

Muscle Contraction Summary

  • Nerve impulse reaches myoneural junction

  • Acetylcholine is released from motor neuron

  • Ach binds with receptors in the muscle membrane to allow sodium to enter

  • Sodium influx will generate an action potential in the sarcolemma


Muscle contraction continued

Muscle Contraction Continued

  • Action potential travels down T tubule

  • Sarcoplamic reticulum releases calcium

  • Calcium binds with troponin to move the troponin, tropomyosin complex

  • Binding sites in the actin filament are exposed


Muscle contraction continued1

Muscle Contraction Continued

  • Myosin head attach to binding sites and create a power stroke

  • ATP detaches myosin heads and energizes them for another contaction

  • When action potentials cease the muscle stop contracting


Motor unit all the muscle cells controlled by one nerve cell

Motor UnitAll the muscle cells controlled by one nerve cell


Motor unit ratios

Motor Unit Ratios

  • Back muscles

    • 1:100

  • Finger muscles

    • 1:10

  • Eye muscles

    • 1:1


Muscle physiology

ATP


Creatine

Creatine + ATP

Creatine phosphate + ADP

Creatine

  • Molecule capable of storing ATP energy


Creatine phosphate

Creatine + ATP

Creatine Phosphate

  • Molecule with stored ATP energy

Creatine phosphate+ ADP


Muscle fatique

Muscle Fatique

  • Lack of oxygen causes ATP deficit

  • Lactic acid builds up from anaerobic respiration


Muscle atrophy

Muscle Atrophy

  • Weakening and shrinking of a muscle

  • May be caused

    • Immobilization

    • Loss of neural stimulation


Muscle hypertrophy

Muscle Hypertrophy

  • Enlargement of a muscle

  • More capillaries

  • More mitochondria

  • Caused by

    • Strenuous exercise

    • Steroid hormones


Steroid hormones

Steroid Hormones

  • Stimulate muscle growth and hypertrophy


Muscle tonus

Muscle Tonus

  • Tightness of a muscle

  • Some fibers always contracted


Tetany

Tetany

  • Sustained contraction of a muscle

  • Result of a rapid succession of nerve impulses


Tetanus

Tetanus


Refractory period

Refractory Period

  • Brief period of time in which muscle cells will not respond to a stimulus


Refractory

Refractory


Refractory periods

Refractory Periods

Skeletal Muscle

Cardiac Muscle


Isometric contraction

Isometric Contraction

  • Produces no movement

  • Used in

    • Standing

    • Sitting

    • Posture


Isotonic contraction

Isotonic Contraction

  • Produces movement

  • Used in

    • Walking

    • Moving any part of the body


The end

THE END


  • Login