1 / 10

Muscle Physiology

Muscle Physiology. Skeletal muscle function. Muscle Strength. A motor unit is one motor neuron and all of the muscle fibers it controls The force with which a whole muscle contracts depends on how many motor units the nervous system stimulates. All or None….

gilon
Télécharger la présentation

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Muscle Physiology Skeletal muscle function

  2. Muscle Strength • A motor unit is one motor neuron and all of the muscle fibers it controls • The force with which a whole muscle contracts depends on how many motor units the nervous system stimulates.

  3. All or None….. • A muscle will either completely contract, or not at all. • This means the stimulus only needs to pass the threshold.

  4. What is the threshold? • The minimum amount of stimulation that will cause a muscle fiber to completely contract. • The amount of work that a muscle is being asked to perform is directly proportional to the threshold of the stimulus.

  5. Types of muscle contractions • Isometric: Muscle increases in tension but does not shorten • Isotonic: The muscle shortens and the amount of tension is constant. • Most muscle movement is a combination of both types of contractions.

  6. Muscle Fatigue • Fatigue is the decrease in ability to do work • Psychological fatigue is when a person thinks he/she cannot do any more muscular work • Muscle fatigue means the muscles have trouble, or are unable to respond to stimuli

  7. Energy for muscle contraction • Creatine phosphate can be used as an energy source for ATP production. • Most ATP is produced during aerobic respiration

  8. Oxygen and exercise • Heavy exercise creates EPOC – excess post-exercise oxygen consumption • The time spent in EPOC depends on each person’s level of fitness • Fat metabolism is also a factor because more oxygen is required to generate energy from fats

  9. Hypertrophy and Atrophy • Hypertrophy is an increase in a muscle’s size • Most hypertrophy is due to exercise • Atrophy is a decrease in muscle size • This is usually due to disuse.

More Related