Muscular System Test Review with
Complete Solutions
Skeletal muscle - ANSWER-volunarty, striated, multinucleate, attached by tendons to
bones
Isotonic Contractions - ANSWER-• myofilaments are able to slide past each other
during contractions
• muscle shortens
ex: bicep curl
Isometric Contractions - ANSWER-• tension in the muscles increases
• the muscle is unable to shorten
ex: carrying an object in front of you
Muscle Tone - ANSWER-• some fibers are contracted even in a released muscle
• different fibers stimulated at different times by nervous system during muscle tone
• the process of stimulating various fibers is under involuntary control
• muscle remains firing, healthy, and ready for action
Orgin - ANSWER-attachment to the immovable bone
Insertion - ANSWER-attachment to the movable bones
Oxygen Debt - ANSWER-• common reason for muscle fatigue
• oxygen is reauired to get rid of accumulated lactic acid
Creatine Phosphate - ANSWER-• located in muscle cells
• high energy molecule
• CP transfers a phosphate to regenerate ATP
• CP supplies are exhausted in 20 sec
How are muscles named? - ANSWER-• direction of muscle fibers (rectus)
• relative size of the muscle (maximus)
• location of the muscle (temporalis)
• number of orgins (triceps)
• shape of the muscle (deltoid)
• action of the muscle (flexor)
• location of orgin & insertion (sterno)
Complete Solutions
Skeletal muscle - ANSWER-volunarty, striated, multinucleate, attached by tendons to
bones
Isotonic Contractions - ANSWER-• myofilaments are able to slide past each other
during contractions
• muscle shortens
ex: bicep curl
Isometric Contractions - ANSWER-• tension in the muscles increases
• the muscle is unable to shorten
ex: carrying an object in front of you
Muscle Tone - ANSWER-• some fibers are contracted even in a released muscle
• different fibers stimulated at different times by nervous system during muscle tone
• the process of stimulating various fibers is under involuntary control
• muscle remains firing, healthy, and ready for action
Orgin - ANSWER-attachment to the immovable bone
Insertion - ANSWER-attachment to the movable bones
Oxygen Debt - ANSWER-• common reason for muscle fatigue
• oxygen is reauired to get rid of accumulated lactic acid
Creatine Phosphate - ANSWER-• located in muscle cells
• high energy molecule
• CP transfers a phosphate to regenerate ATP
• CP supplies are exhausted in 20 sec
How are muscles named? - ANSWER-• direction of muscle fibers (rectus)
• relative size of the muscle (maximus)
• location of the muscle (temporalis)
• number of orgins (triceps)
• shape of the muscle (deltoid)
• action of the muscle (flexor)
• location of orgin & insertion (sterno)
