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ch 8
functions of skeletal muscle
| Question | Answer |
|---|---|
| functions of skeletal muscle | posture, movement, heat production, fatigue |
| movement- | muscles pull on bones as muscles contract |
| movement occurs at | joint between origin and insertion |
| groups of muscles usually contract to produce | ONE movement |
| prime | main |
| synergist | helps prime and may add force and reduce unwanted movement |
| antagonist | opposite of prime |
| tonic contraction (muscle tone ) | let's us maintain body position, no movement, maintain posture |
| only few muscle fibers - muscle tone | can shorten at one time |
| posture | holds body parts in position |
| skeletal muscle tone keeps good posture by | counteracting gravity |
| contraction of muscle fibers | makes most heat |
| normal body temp. | 98.6 |
| fever | 100.4 |
| hypothermia | dangerously cold |
| what depends on body temp | enzymes and organs |
| fatigue | reduced strength of muscle contraction |
| fatigue can be caused by | repeated muscle stimulation without rest and repeated muscle stimulation depletes atp |
| muscle contraction without adequate o2 | makes lactic acid which makes muscles sore |
| lactic acid | anerobic respiration |
| atp | aerobic (normal) respiration |
| oxygen debt | metabolic effort required to burn excess lactic acid that builds up during prolonged periods of exercise |
| labored breathing | required to " pay debt " and adds atp |
| inc metabolism helps | restore energy |
| o2 is used to | get rid of built up lactic acid |
Created by:
b.marshall