Skeletal and muscular systems Flashcards
Define ISOTONIC CONTRACTION
contractions that cause the muscle to change length, producing movement
Define CONCENTRIC
contractions that cause the muscle to shorten e.g. bicep curl (upwards)
Define ECCENTRIC
contractions that cause the muscle to lengthen e.g. bicep curl (downwards)
Define ISOMETRIC CONTRACTION
there is no change in the length of the contracting muscle, causing no movement
Define LATERAL
towards the outside
Define MEDIAL
towards the middle
Define POSTERIOR
towards the back
Define ANTERIOR
towards the front
What movement occurs at the HIP ?
- flexion
- extension
- adduction
- abduction
- medial rotation
- lateral rotation
What movement occurs at the KNEE ?
- flexion
- extension`
What movement occurs at the ANKLE ?
- plantar flexion
- dorsi flexion
HIP : FLEXION : AGONIST
iliopsoas
HIP : EXTENSION : AGONIST
gluteus maximus
HIP : ADDUCTION : AGONIST
adductor longus
HIP : ABDUCTION : AGONIST
gluteus medius
HIP : M.ROTATION : AGONIST
gluteus medius
HIP : L.ROTATION : AGONIST
gluteus maximus
KNEE : FLEXION : AGONIST
bicep femoris
KNEE : EXTENSION : AGONIST
rectus femoris
ANKLE : PLANTAR FLEXION : AGONIST
gastrocnemius
ANKLE : DORSI FLEXION : AGONIST
tibialis anterior
SPINE : EXTENSION : AGONIST
erector spinae
SPINE : FLEXION : AGONIST
rectus abdominus
Describe the frontal plane
splits the body into front to back parts
Describe the sagittal plane
splits the body into left and right parts
Describe the transverse plane
splits the body into upper and lower parts
Give a sporting example that goes through the frontal plane
a starjump
Give a sporting example that goes through the sagittal plane
a somersalt
Give a sporting example that goes through the transverse plane
arm action when throwing a discus
Define the origin
the point of muscular attachment to a stationary bone which stays fixed during muscular contraction
Define the insertion
the point of muscular attachment to a moveable bone which gets closer to the origin during muscular contraction
Define the fixator
a muscle that stabilises a joint
Descibe the structure of the motor unit
motor neurone, axon, muscle fibres
What is the ‘all or none’ law?
depending on whether the action potential is above a threshold, all muscle fibres will contract or none will contract at all
What are the three muscle types?
Slow oxidative, fast oxidative glycolytic, fast glycolytic
Give 2 characteristics of slow oxidative muscle fibres
produces a small amount of force, high resistance to fatigue
Give 2 characteristics of fast oxidative glycolytic muscle fibres
produces a large amount of force, moderate resistance to fatigue
Give 2 characteristics of fast glycolytic muscle fibres
produces the largest force, low resistance to fatigue
Give the function of flat bones and an example
protect internal organs e.g sternum
Give the function of long bones and an example
act as levers for movements e.g femur
Give the function of irregular bones and an example
protects the spinal cord e.g vertebrae
Give the function of short bones and an example
weights bearing e.g carpals
Give the function of sesamoid bones and an example
ease joint movements e.g patella
Name the 5 features of a synovial joint
ligament, synovial fluid, articular cartilage, joint capsule, bursa
Name the bones in the axial skeleton
cranium, sternum, rib cage, vertebral column
EQ. Identify one of the quadricep muscles and the type of synovial joint at the knee. Outline the functional role and type of contraction in the quadriceps muscle during the preparation and execution of the kick. (6 marks)
- one quadricep muscle is the rectus femoris
- the knee is a hinge joint
- during the preparation of a kick, the rectus femoris is the antagonist
- eccentrically contracts
- during execution, the rectus femoris is the agonsit
- concentrically contracts