The Muscular System 6PART B. PowerPoint Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College
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1 PowerPoint Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College The Muscular System 6PART B
2 Contraction of 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 Graded responses different degrees of skeletal muscle shortening
3 Contraction of Skeletal Muscle Graded responses can be produced by changing The frequency of muscle stimulation The number of muscle cells being stimulated at one time
4 Types of Graded Responses Twitch Single, brief contraction Not a normal muscle function
5 Types of Graded Responses Figure 6.9a
6 Types of Graded Responses Tetanus (summing of contractions) One contraction is immediately followed by another The muscle does not completely return to a resting state The effects are added
7 Types of Graded Responses Figure 6.9b
8 Types of Graded Responses Unfused (incomplete) tetanus Some relaxation occurs between contractions The results are summed
9 Types of Graded Responses Figure 6.9c
10 Types of Graded Responses Fused (complete) tetanus No evidence of relaxation before the following contractions The result is a sustained muscle contraction
11 Types of Graded Responses Figure 6.9d
12 Muscle Response to Strong Stimuli Muscle force depends upon the number of fibers stimulated More fibers contracting results in greater muscle tension Muscles can continue to contract unless they run out of energy
13 Energy for Muscle Contraction Initially, muscles use stored ATP for energy ATP bonds are broken to release energy Only 4 6 seconds worth of ATP is stored by muscles After this initial time, other pathways must be utilized to produce ATP
14 Energy for Muscle Contraction Direct phosphorylation of ADP by creatine phosphate (CP) Muscle cells store CP CP is a high-energy molecule After ATP is depleted, ADP is left CP transfers energy to ADP, to regenerate ATP CP supplies are exhausted in less than 15 seconds
15 Energy for Muscle Contraction Figure 6.10a
16 Energy for Muscle Contraction Aerobic respiration Glucose is broken down to carbon dioxide and water, releasing energy (ATP) This is a slower reaction that requires continuous oxygen A series of metabolic pathways occur in the mitochondria
17 Energy for Muscle Contraction Figure 6.10b
18 Energy for Muscle Contraction Anaerobic glycolysis and lactic acid formation Reaction that breaks down glucose without oxygen Glucose is broken down to pyruvic acid to produce some ATP Pyruvic acid is converted to lactic acid This reaction is not as efficient, but is fast Huge amounts of glucose are needed Lactic acid produces muscle fatigue
19 Energy for Muscle Contraction Figure 6.10c
20 Muscle Fatigue and Oxygen Deficit When a muscle is fatigued, it is unable to contract even with a stimulus Common cause for muscle fatigue is oxygen debt Oxygen must be repaid to tissue to remove oxygen deficit Oxygen is required to get rid of accumulated lactic acid Increasing acidity (from lactic acid) and lack of ATP causes the muscle to contract less
21 Types of Muscle Contractions Isotonic contractions Myofilaments are able to slide past each other during contractions The muscle shortens and movement occurs Isometric contractions Tension in the muscles increases The muscle is unable to shorten or produce movement
22 Muscle Tone Some fibers are contracted even in a relaxed muscle Different fibers contract at different times to provide muscle tone The process of stimulating various fibers is under involuntary control
23 Effect of Exercise on Muscles Exercise increases muscle size, strength, and endurance Aerobic (endurance) exercise (biking, jogging) results in stronger, more flexible muscles with greater resistance to fatigue Makes body metabolism more efficient Improves digestion, coordination Resistance (isometric) exercise (weight lifting) increases muscle size and strength
24 Effect of Exercise on Muscles Figure 6.11
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