NSCA CSCS Chapter 1 Exam Questions with Answers
neuromuscular junction - Answer-junction between motor neuron and muscle fibers it innervates
motor unit - Answer-motor neuron and muscle fibers it innervates
myofibrils - Answer-contain the apparatus that contracts muscle cells
myofilament...
action potential - Answer-signals motor neurons to release calcium from sarcopalasmic
reticulum into myofibril = tension development
sliding filament theory - Answer-actin filaments at end of sarcomere slide inward over
myosin filaments, pulling z lines toward center and shortening muscle = contraction
h zone and i band - Answer-shrink during sliding filament theory
troponin - Answer-calcium binds to this; protein situated at regular intervals along actin
filament
tropomyosin - Answer-protein molecule runs length of actin filament in the groove of the
double helix
crossbridges - Answer-number of these formed between actin and myosin dictates force
production
cerebral cortex - Answer-part of brain that controls skeletal muscles
musculoskeletal system - Answer-consists of bones, joints, muscles, and tendons
muscles - Answer-function by pulling against bones that rotate about joints and transmit
force to the enviornment
muscles - Answer-can only pull
positvely affect adult skeleton - Answer-body subjected to heavy loads, explosive
movements, loaded axial skeleton
heavy loads - Answer-lifting these increases bone density and bone mineral content
explosive - Answer-movement type for increasing bone density and bone mineral
content
bone - Answer-adaptation of this takes longer than muscle
206 - Answer-number of bones in body
bones - Answer-provides leverage, support, and protection
axial skeleton - Answer-consists of the skull, vertebral column, ribs, and sternum
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