Muscular system chapter

Book Title

DOLOR SET AMET

LOREM IPSUM

McKenna Chase Friday, October 3, 2014 at 9:27:05 AM Pacific Daylight Time 70:cd:60:8b:aa:a6

Muscular System


SECTION 1

Muscle Vocabulary

-Abduction: movement away from the medial plane

-Adduction: movement toward the median plane

-Agonist: prime mover of a joint

-Antagonist: opposes movement of the agonist

-Ambulation: moving from one place to another

-Extension: increasing angle between body parts

-Flexion: decreasing angle between body parts

-Synergist: muscle that indirectly aids the agonist; add extra force

-Sarcomere: the most basic unit of a muscle cell (fiber)

*all muscles are paired with another muscle that works opposite of each other*

2McKenna Chase Friday, October 3, 2014 at 9:27:05 AM Pacific Daylight Time 70:cd:60:8b:aa:a6

3

Skeletal Muscle Cells

-Function: allows for voluntary movement -Location: attached to bone -Appearance: striated, long, and cylindrical

Cardiac Muscle Cells

-Function: pumps blood through vessels; involuntary -Location: the heart -Appearance: branching, chains of cells; striated


4

Smooth Muscle Cells -Function: responsible for all other invol-untary movement like breathing, diges-tion, peristalsis, blinking, etc. -Location: lines hollow organs and blood vessels -Appearance: no striations, single cells

Sarcomere

Function: responsible for all movement-Actin: thin filament-Myosin: thick filament -Myosin will bind to actin creating bridges that shorten which causes the muscle to contract -In order for myosin to release from actin it uses one molecule of ATP (energy) *it takes energy to relax, it does not take energy for your muscles to contract*


5McKenna Chase Friday, October 3, 2014 at 9:27:05 AM Pacific Daylight Time 70:cd:60:8b:aa:a6

Health & Medicine

Muscular system chapter