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Functions of the Skeletal Muscle

Functions of the Skeletal Muscle. Chapter 7. Functions of the Skeletal Muscle. Movement Posture and Muscle Tone Maintain Constant Body Temperature. Movement. A muscle’s insertion bone moves towards its origin bone. Agonists. Prime Mover. Movement Production. Antagonists. Synergists.

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Functions of the Skeletal Muscle

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  1. Functions of the Skeletal Muscle Chapter 7

  2. Functions of the Skeletal Muscle • Movement • Posture and Muscle Tone • Maintain Constant Body Temperature

  3. Movement • A muscle’s insertion bone moves towards its origin bone.

  4. Agonists Prime Mover Movement Production Antagonists Synergists Opposite movement of Prime Mover Assistants & Stabilizers

  5. How Muscles Work

  6. Make It Happen • With a table partner, try this activity: • Have one partner place one hand on their partner’s biceps and the other on their triceps. • Once their hands are in place- bend your arm and straighten it a few times. What does your partner feel? Switch. • Once both of you have felt the muscle contract, show off your guns. Flex (or bend your arm) your biceps. What does the biceps look like when your “flexing”? Now relax and straighten your arm. What does your biceps look like now?

  7. Posture and Muscle Tone Tonic contraction Gravity tends to pull the head and trunk down and forward • Helps us maintain our body position • The muscle does not shorten and no movement occurs • Maintains posture by balancing the distribution of weight,therefore put the least strain on muscles, tendons, ligaments, and bones

  8. Maintain ConstantBody Temperature • Decrease hypothermia • Contraction of muscle fibers produces most of the heat required to maintain body temperature

  9. Fatigue • If muscle cells are stimulated repeatedly without adequate periods of rest, the strength of the muscle contraction decreases, resulting in fatigue. • Oxygen debt – Lack of oxygen • cells produce lactic acid • labored breathing after exercise helps to pay the debt • homeostasis at work

  10. Role of otherBody Systems in Movement • The respiratory, circulatory, nervous, muscular, and skeletal systems all play an essential role in producing normal movements.

  11. The Motor Unit • A single motor neuron and all the muscle fibers it connects with.

  12. Muscle Stimulus • The minimal level of stimulation required to cause a fiber to contract is called the threshold stimulus • Complete contraction of a muscle fiber – “all or none”

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