Muscular System Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Question | Answer |
Leg Muscles (anterior) | Quadriceps Rectus femoris Vastus lateralis Vastus medialis Vastus intermedius Adductor group Tibialis anterior |
The Motor Unit | 1 motor unit = junction between 1 neuron + many muscle fibres |
Leg muscles (posterior) | Gluteus maximus Hamstrings Biceps femoris Semimembranosus Semitendinosus Gastrocnemius Soleus |
Muscle Tissue - Three Types | Skeletal / Striated / Voluntary Smooth / Non-striated / Involuntary Cardiac / Striated / Involuntary |
Skeletal Muscle Organisation | Muscles are organised as follows, from macrostructure to microstructure: Muscle Fascicle Muscle Fibre Myofibril Myofilament Sarcomere |
Myofibrils | Rodlike contractile element. Occupy most of the muscle cell volume Appear banded - A bands - dark, I bands - light Composed of sarcomeres - arranged end to end |
Functions of Muscle Tissue Movement | of a particular limb (external movement) of materials inside the body Posture to keep us upright Stabilisation to stabilise joints Heat Production70% of energy used by muscles is transferred into heat (released by breakdown of ATP) |
Movement (voluntary) | Nearly all movements of the human body are a result of muscle contraction Mobility of body as a whole reflects activity of skeletal muscles, responsible for all locomotion (walking for example) and manipulation |
Movement (involuntary) | Smooth muscle of blood vessel walls and cardiac muscle of the heart - which work together to circulate blood and maintain blood pressure and the smooth muscle of other hollow organs, which forces fluids and other substances through internal body channels |
Posture | Yet, they function almost continuously, making one tiny adjustment after another so that we can maintain an erect or seated posture despite the never-ending downward pull of gravity |
Stabilisation | As the skeletal muscles pull on bones to cause movements, they also stabilise the joints of the skeleton |
Heat Production | Since skeletal muscle accounts for at least 40 percent of body mass, it is the muscle type most responsible for heat generation |
Characteristics of Muscle Tissue | Excitability- ability to respond to a stimulus Contractibility- muscle can become shorter and thicker Extensibility- able to stretch Elasticity- ability to return to original shape and size |
Cardiac Muscle Tissue | Striated -but muscle fibres are branching and fit together like clasped fingers (allows cardiac muscle to act as a unit) Not under conscious control - self exciting Can beat by itself, but CNS can accelerate and decelerate heart-rate |
Myofilaments | Thread like structures - make up myofibrils 2 proteins arranged as Thin or Thick filaments These 2 slide past each other - create contraction Arrangement of myofilaments in myofibrils, produces banding pattern in skeletal muscle |
Sarcomere | contractile unit composed of myofilaments filaments made up of contractile proteins |
Posterior Muscles | Trapezius Deltoid Latissimus dorsi Rhomboids Triceps brachii |
Anterior Muscles | Sternocleidomastoid Deltoid Pectoralis major Biceps brachi Rectus abdominis External oblique |
Created by:
1109385690
Popular Science sets