• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Muscles in the Human Body

Extracts from this document...

Introduction

´╗┐Muscular System Jessica WILLIAMSON ________________ The muscle tissue has four main properties; Excitability, Contractibility, Extensibility and Elasticity. Excitability; The ability to respond to stimuli. Contractibility; The ability to contract. Extensibility; The ability to stretch without causing a tear. Elasticity; The ability to be able to return to normal shape. While contraction is taking place the muscular system performs 3 functions; Motion, Heat Production and Maintenance of posture. Motion; The ability of being able to move e.g. walking or running. However, with motion you must know about levers. The framework of the body is covered in muscle which permits movement. When moving or lifting a heavy load, it?s easier to use levers, and in the body it?s the exact same. All levers use 5 different parts; Lever, Fulcrum, Muscle force, Resistive force and Torque. Lever; almost always the bone Fulcrum; the pivot point of the lever in which is usually the joint. ...read more.

Middle

Third-class; most of the limbs in the human body are third-class levers. When the muscle force and resistive force act on the same side of the fulcrum, with the muscle force acting through the lever shorter than that through which the resistive force acts - e.g. adduction of the thigh. The weight of the thigh is the resistance, the hip joint is the fulcrum, and the contraction of the adductor muscle is the effort. Heat production; The ability of being able to maintain body temperature. However, when a muscle contracts this produces around 70% of body heat due to the energy produced in the muscle tissue. Blood is another essential element in temperature control; this is because during exercise, heat from the body core and working muscles is redirected to the skin when the body is overheating. When the internal heat of the body reaches too low of a level thermo receptors in the skin relay a message to the hypothalamus in the brain. ...read more.

Conclusion

Type 1; which is also known as slow twitch, they contract more slowly which enables you to keep going for a long time. Slow twitch fibres are good for endurance activities such as cross country, as they work for a long time without getting fatigued. Usually slow twitch fibres are red because they are rich in oxygen that provides the energy for the muscles. Type 2; more commonly known as fast twitch fibres, they contract a lot quicker but are easily fatigued. They use anaerobic metabolism to create fuel. Fast- twitch fibres can be split into two groups; Type 2a and Type 2b. Type 2a; also known as fast-oxidative-glycolytic, have a quick contraction speed they are generally used for aerobic metabolism, and are able to use either glucose or fats as a source of energy. Type 2b; also known as fast glycolytic, have a quick contraction speed and are only recruited for brief maximal efforts they are easily fatigued. They are what most people would think of as sprinters muscle fibres, and are therefore of no use for sustained performance. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Anatomy & Physiology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Anatomy & Physiology essays

  1. Physiology Within Sport

    The final result of all of these adaptations increases the maximal oxygen consumption also known as the VO2 max this reduces the fatigue rate and increases the anaerobic threshold. When athletes train at high intensities this increases the hypertrophy of the fast twitch fibres this is because there increasing levels

  2. A level Project, Personal Exercise Program on Netball.

    The frequency of resistance training is dependent upon the particular individual and format of the program. A program that works every body part every session should be completed 3-4 days a week with a day's rest between sessions so to allow recovery.

  1. Movement within the Body and the Cardiovascular System

    It receives de-oxygenated blood from the lungs from both the superior vena cava and the inferior vena cava. It then pumps this blood to the right ventricle via the tricuspid valve. The Sinuatrial node (SAN) is in the right ventricle next to the vena cava.

  2. Describe the attachment of muscles and how they produce movement and provide support.

    The muscle fibre structure is highly organised and easy to understand, the language is hard. PIC 2 Muscle fibres contain many myofibrils, which are organised arrays of myofilaments. Myofilaments are molecular filaments of two types. Thick filaments that are composed principally of myosin, and thin filaments, which are composed of actin.

  1. A.S Personal exercise program for netball

    It may not be suitable to perform these exercises as a considerable amount of space will be required. Cool down routine 5 to 10 minutes jogging/walking - decrease body temperature and remove waste products from the working muscles, including 5 to 10 minutes static stretching exercises- decrease body temperature, remove

  2. The body's response to exercise- Regular aerobic activity results in a type of cardiac ...

    Therefore, a trained person will store less heat early during steady state exercise, reaching a thermal steady state sooner and at a lower core temperature than an untrained person. The training advantage for thermoregulation happens only if the individual fully hydrates during exercise.

  1. Looking at the skeletal and muscular system and the use of this system during ...

    Joints There are three types of joints these are: * Fibrous * Cartilaginous * Synovial Fibrous or Fixed Joint- A fibrous or fixed joint has no movement at all. Tough fibrous tissue lies between the ends of the bone, which are dove tailed together.

  2. Anatomy For BTEC Sport - bones and muscles.

    Each muscle is can contract and relax to make the body move. There are around 600 muscles in a human body and each are organized into categorise to what action they perform, these are; Extensors - these open a joint and flexors close a joint.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work