Muscle Physiology chp 10

joflo's version from 2016-03-06 19:43


Organization of the Muscular System:


-about 600 human skeletal muscles


Muscles are organized and named by:


-1.shapes, 2.actions, and 3.innervation of muscles


Functions of Skeletal Muscles:
Movement: bones, non-bony (lips eyelids etc), organs, childbirth etc
Stability: maintain posture, prevent unwanted movement, hold articulating bones (humerus and scapula)
Communication: speech, hand writing, facial and hand gestures
Control: body openings and passages with ring-like sphincter muscles ex. around eyes, mouth, stomach, intestines
Body heat production: 85% of body heat results form skeletal muscle metabolism


Characteristics of Muscle Cells
Responsive: response to chemical, electrical, and stretch signals
Conductive: electrical change in a cell triggers a wave of excitation that travels along the cell....signal from brain to cells
Contractile:cells shorten when stimulated by converting the chemical energy of ATP into mechanical energy
Extensible: cells capable of being stretched
Elastic: cells return to original length after stretched


Types of Muscle Tissue
1.Striated Muscle (cytoplasm HAS cross striations...organized column like tissues)
-striated SKELETAL muscle
-striated CARDIAC muscle
2. Smooth Muscle (cytoplasm WITHOUT cross striations....unorganized tissues)


Series Elastic Components of the Musculoskeletal System