Download Anatomy of the Human Skeletal System: Terms, Definitions, and Sex Differences and more Quizzes Biology in PDF only on Docsity!
TERM 1
axial skeleton
DEFINITION 1 forms the central axis of the bodyskull, ribs, vertebra TERM 2
appendicular skeleton
DEFINITION 2 attatched to the axislimbs, pelvis, shoulder girdle TERM 3
function of the skeleton
DEFINITION 3 -to support the body-to aid movement-to store minerals-to protect internal organs-for blood cell production TERM 4
sex differences in bone structure
DEFINITION 4 -men have longer legs and arms than women-women have smaller: frontal bones (forehead),temporal bones (a pair of),mandible (jawbone)-women have: an increased Q angle, lower center of gravity, flatter & broader pelvis, greater spinal curvature, larger, rounder pelvic inlet, shorter femurs*for childbirth TERM 5
skeletal muscle
DEFINITION 5 one of the three types of muscle in humansfunction: to interact with bones to produce voluntary body movements
TERM 6
mode of action of the skeletal muscle:
antagonistic pairs
DEFINITION 6 -muscles can only contract but cant return into their original positions-a pair of muscles pull in the opposite directionsto raise the forearm: biceps contract -> pull triceps back into the original relaxed positionto lower the forarm: triceps contract -> pull biceps back into the original relaxed position TERM 7
skeletal muscle structure
DEFINITION 7 composed of bundles of muscle fibers arranged in parallelthe parallel arrangement of fibers gives skeletal muscle its characteristic striated appearance-each muscle fiber is a single cell, made of paralleled filaments called myofibrils-each myofibril is made of sacromeres, the units of contraction of a muscle fiber- each sacromere is composed of proteins actin and myosin TERM 8
sliding filament mode of muscle contraction
DEFINITION 8
- ATP binds to myosin which is released from actin filament2. the use of ATP "cocks" the myosin3. myosin head binds to an actin molecule, drawing the actin filament towards the center, shortening the sacromere
