Appendicular Skeleton. Pectoral girdle & arms Pelvic girdle & legs.
SKELETAL SYSTEM Day ^. Bell Quiz 1. Smaller lower leg bone 2. knee cap 3. Part of the pelvic...
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Transcript of SKELETAL SYSTEM Day ^. Bell Quiz 1. Smaller lower leg bone 2. knee cap 3. Part of the pelvic...
SKELETAL SYSTEMDay ^
Bell Quiz 1. Smaller lower leg bone 2. knee cap 3. Part of the pelvic girdle you sit on 4. Name as many of the seven tarsals as
you can 5. How many metatarsal do you suppose
you have? 6. How many phalanges?
1. Fibula 2. Patella 3. Ischium 4. Medial cuneiform, lateral cuneiform,
intermediate cuneiform, cuboid, navicular, calcaneus, talus
5. 10 6. 28
Metatarsals Body of foot (10)
Arches- absorbs shocks
Phalanges Toes (28)
Physiology
Articulation : Where two bones meet
Ligaments – bone to boneTendons – muscle to bone
Types of joints
Synarthrosis (Fibrous) Joint with NO movement
Sutures in
Cranium
Amphiarthrosis (Cartilaginous) Slightly moveable joint
Diarthrosis (Synovial)
Freely moveable, includes a capsule (bursa) that releases synovial fluid for lubrication.
Ball and socket – shoulder, hip
Pivot – Head, radius, ulna
Gliding – carpals
Levers Bone – Lever Muscle – Effort Joint – Fulcrum R – Resistance
*see saw *effort balances the load. This pivot exists in the place where your
skull meets the top of your spine. Your skull is the lever arm and the neck muscles at the back of the skull provide the force (effort) to lift your head up against the weight of the head (load). When the neck muscles relax, your head nods forward.
Class 2 ( calf muscle)
*Wheelbarrow
Standing on tip toes is a Class 2 lever. The pivot is at your toe joints and your foot acts as a lever arm. Your calf muscles and achilles tendon provide the effort when the calf muscle contracts. The load is your body weight and is lifted by the effort (muscle contraction).
Class 3 (wrist, fingers, elbows)
A bent arm is a Class 3 lever. The pivot is at the elbow and the forearm acts as the lever arm. The biceps muscle provides the effort (force) and bends the forearm against the weight of the forearm and any weight that the hand might be holding.
Actions – how we can move
Flexion and Extension
Rotation
Abduction and Adduction
Homeostatsis
Calcium and Phosphorus Vitamin D – maintain normal blood levels
of Ca and P
Hormones Chemicals released by cells that send
messages to other parts of your body
Growth Hormone HGH Pituitary
Increases Calcium retention in bones and mineralization
Sex HormonesEstrogen and Testosterone
Secreted by the testes and ovaries
Increases bone density and maturation
Calcitonin Thyroid Inhibit osteoblast activity
PTH - Parathyroid Bones release
calcium into blood stream