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flexors
the muscles which bend a limb at a joint by contracting eg bicep
prime movers - agonist
the main muscle which contracts to produce the movement (i.e. bicep when bending the arm)
abductors
muscles which move a limb towards the body - deltoid
extensors
the muscles which work against the flexors + straighten a limb at a joint by contracting - tricep
adductors
the muscles which move a limb towards the body - latissimus dorsi
antagonists
the muscle which works against the agonist and relax to allow the movement to take place (i.e. tricep when bending the arm)
cartilage
shock absorber, stops bones rubbing together/wearing away e.g. meniscus (between the tibia and femur at the knee joint).
ligaments
attach bone to bone, have to be strong/elastic, keep joints stable e.g. cruciate ligament
tendons
attach muscle to bone, strong/non-elastic e.g. achilles tendon
functions of the skeleton
-structure and support
-protection of vital organs
-movement
-mineral storage
-blood cell production
types of bones
long, short, flat and irregular
What are short bones?
Bones that help with gripping, balancing, and fine movements.
Give examples of short bones.
Carpals and tarsals
What are long bones?
These bones are used in most of our movements like running and throwing.
Long bone examples
femur, humerus, radius, ulna, tibia, fibula
What are flat bones?
These bones are very important for protection
Flat bone examples
cranium, ribs, sternum, scapula
What are irregular bones?
Irregular shape bones found in the face and spine
Irregular bone examples
Vertebrae, jawbone, cheekbone
Synovial joints
joints filled with fluid that surrounds cartilage attached at the end of each of the bones that meet at the joint
6 types of joint
-Pivot
-Hinge
-Ball and socket
-gliding
-Saddle
-condyloid (Ellipsoid)
Ligaments
Synovial fluid
Bursae
Tendons
Ball and socket joint
most moveable joint, turns in many directions
hips, shoulder
hinge
bone can swing back and forward (like a door hinge)
knee, elbow
pivot
only allows rotation
neck (atlas + axis), joint between radius + ulna (elbow)
extension
increase angle of joint
flexion
decrease angle of joint
abduction
Movement away from the midline of the body
adduction
Movement toward the midline of the body
plantar flexion
pointing toes towards the ground
dorsiflexion
pointing toes toward the sky
rotation
movement of the joint at 360 degrees