presentation by: chris bryant jesse curran. all movements of the human body require muscles. whether...
TRANSCRIPT
Overview
• All movements of the human body require muscles.
• Whether you punch a friend, or digest food, you are using your muscles.
How a Muscle Contracts
https://www.youtube.com/watch?v=9ahYCeeoabc
Summation Definition: A
muscle fiber exposed to a series of stimuli of increasing frequency reaches a point when it is unable to completely relax before the next stimulus in the series.
Sustained Contractions & Muscle Tone
Even when muscles appear to be at rest they are sustaining some contraction giving them Muscle Tone.
Recruitment: An increase in the number of motor units being activated during intense activity.
Parts of Muscle
Origin: immovable end of a muscle
Insertion: the movable end
Prime mover: main muscle moving
Synergists: stabilizer muscles
Antagonist: opposing the prime mover Example: triceps and biceps
Diseases and Disorders
Dushenne Muscular Dystrophy: protein dystrophin is missing Helps attach cell to surrounding extracellular
matrix. Fatty and connective tissue replaces muscle.
Chariot-Marie-Tooth Disease: slowly progressing weakness in muscles of the hand and feet and decrease in tendon reflexes. Extra gene impairs insulting sheath around
nerve cells so cannot correctly stimulate involved muscles.
Works Cited stepson-clipart-5767-exhausted-female-marathon-runner-drinking-water-
clipart-illustration1 http://www.bing.com/images/search?q=muscle%20system%20diagram&qs=
IM&form=QBIRMH&pq=muscle%20system%20&sc=8-14&sp=1&sk=#view=detail&id=466F1F368100C1C8A6A94940EDA3EE779287BD27&selectedIndex=67
http://www.bing.com/images/search?q=muscle%20system%20diagram&qs=IM&form=QBIRMH&pq=muscle%20system%20&sc=8-14&sp=1&sk=#view=detail&id=59316EC2CCCA3E8E418EB55DD02E53C6D58C5AE9&selectedIndex=135
http://www.bing.com/images/search?q=heart%20beating%20gif&qs=n&form=QBIRMH&pq=heart%20beating%20gif&sc=5-17&sp=-1&sk=#view=detail&id=AE6F352726C7DEC7E999F05F56F7D9C1588C3D52&selectedIndex=91
http://www.wpclipart.com/energy/atom/atomic_particle.png