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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.

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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



Z line

Z line






Tropomyosin

Binding Site

Troponin





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



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



Refractory period
Refractory Period

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



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



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