27 terms

Health Chapter 15 Review

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the 4 purposes of the skeletal system-
1. provides strong, stable and mobile framework so muscles can act
2. protects your internal tissues and organs from trauma
3. your bones store minerals that other systems use (ex- calcium and phosphorus)
4. bone marrow produces new red and white blood cells
types of bones in the skeletal system-
flat bones, long bones, short bones, irregular bones.
flat bones are located in
skull, shoulder blade, ribs (protect organs the most)
long bones are located in
bones in the legs and arms
short bones are located in
small bones in the wrists and ankles
irregular bones are the
unusual shaped bones of the face and vertebrae
4 types ofjoints and exs of each
ball and socket- hip and shoulder
hinge- elbow and knee
ellipsidal- wrists and ankles (bones slide over each other)
pivot- turning of the head
there are how many bones in the body?
206
what are the major bone disorders we learned?
osteoprosis- serious bone disorder which bone is progressively lost, becomes brittle and breaks easily.
scoliosis- a lateral or side-to-side curvature of the spine.
voluntary muscle movement-
you can control the muscle yourself (like skeletal muscles that u use to move.).
involuntary muscle movement-
muscles that work on there own; we dont control them (like smooth and cardiac muscles [internal organs, blood vessels, the heart]).
whts the differnce between contraction and extension-
contractions when ur a muscle becomes shorter and tighter and extensions when a muscle becomes longer and looser.
what are the types of muscle tissue?
smooth muscles, cardiac muscles, and skeletal muscles
smooth muscles are
the muscles of internal organs and blood vessels, are involuntary and makes up 7% of muscles
cardiac muscles are
the muscle only in the heart, are involuntary and make up 3% of muscles
skeletal muscles are
the muscles that help you move, are voluntary (only type of muscle that is), and make up 90% of muscles
what causes muscle spasms
single muscle in voluntary contracts (like a tic or a twitch)
shivering is
a movement made by ur muscles (skeletal muscles) hen it involuntary contracts to produce heat.
goosebumps are
muscle contractions in response to cold or fear
dislocation-
where ligments attache to bone have torn away from their attachment and the bone has gone out of the joint.
torn cartilage-
the bone covering at the end has cracked or broken away from a sharp blow or twisting of a joint.
compound fracture-
any break in a bone that pierces the skin.
flexion- and extension
movement that reduces a joint angle; movement that increases a joint angle.
fibers
hundreds of long cells (or hundreds of bundles for major large muscles) that make up muscle
ligaments
connectie tissue that will stretch and connect bone to bone
tendons-
connective tissue that attachs muscle to bone
nerve impulses do what to muscles?
nerve impulses from the brain trigger muscle contractions
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