Phys muscle ch 12

liveitupsunshine's version from 2017-10-04 02:20

Section 1

Question Answer
what accounts for 40 to 50 percent of body massmuscle
3 characteistics of skeletal musclestriated, multinucleated, voluntary control
3 characteristics of cardio musclesstriated, intercalated discs, involuntary muscle
3 charactoristics of smooth musclenon-striated, involuntary muscle, uninucleated
what is excitabilityability to recieve and respond to stimulus
what is contractilityability to shorten forcibly when stimulated
what is extensibilityability to be streched
what is elacticitythe ability to recoil and resume original length after being stretched
what does the fibrous muscles dosurrounds and protects muscular tissue and forms tendons which attach muscle to bone
what does fibrous connective tissue (fascia) doforms 3 layers within the skeletal muscle
what are the 3 layers of fascia and their locationsepimysium- outer most layer surrounds the muscle, perimysium- middle layer that surrounds muscle fasicles (bundle of muscle cells) endomysium- inner most layer thar surrounds individual muscle cells in each fasicle
what is the plasma membrane of a muscle cellsarcolemma
what is a sarcoplasmthe cytoplasm of a muscle cell
what extends through the cell and carries action potentials deep into the tissuet (transvere) tubual
what is the calcium storage in the muscle cellssarcoplasmic reticulum
what is the dialated end sacs in the SR that are near t tubualsterminal cisterna
what is a triadt tubual with a terminal cisterna on either side

Section 2

Question Answer
what are the rod like structurs that extend the length of the cellmyofibers
what is the sarcomere consist of thin and thick filiments
what are thick filiments composed ofprotein myosin
in thwe thick filiment the myosin heads cross bridge with whatatp-binding sites and actin-binding sites
atp-binding sites function as whatmyosin ATPase enzyme splitting ATp to ADP an P
what are the 3 different type of proteins the thin filiment containactin, troponin and tropomyosin
troponin bind to tropomyosin causing whattroponin-tropomyosin complex
what are the three proteins of troponin and their jobstroponin I - inhibits cross bridge bunding to actin troponinT - bunds to tropomyosin troponin C binds to calcium
what part of the sarcomere appears arkAband anisotropic thick filiments overlap thin filiments
what part of sarcomere only thick filimentsH zone
what part of the sarcomere contains only thin filiments I band isotropic
what part of the sarcremere is located at either end of each new sarcomerez disc
what do you call the very senter of the sarcomerem line
what happens to the thick and thin filiments during a contractionthey do not shorten they increase their overlap
in the process of a contractrion, what happens to the distance between z discgets smaller
n the process of a contractrion, what happens to the length of the A bandstays the same
n the process of a contractrion, what happens to the length of the H zonegets smaller
n the process of a contractrion, what happens to the length of the I band gets smaller
muscles that control small precise movements. they have ____ motor units and ____muscle fibersmany/few
muscles that cause large powerful movements have _________motor units and ____muscle fibersfew/many
within the muscle the axon will eventually branch into _____ resulting in a synaptic end bulbtelodendria
what is a synapsefunctional junction (site of interaction) between a neuron and another cell
what is a neuromuscular junctiona synapse between a motor neuron and a myofiber
what are the two other acetylcholine receptors in the bodynicitinic and muscelrinic
what is the enzyme located in the junctional gap and degrades the ACh, ending the depolerizing signal of the muscle cellacetylcholineesterase

Section 3

Question Answer
what type of channel is a nicotinic receptorligated gated Na+ channel
action potential cause what to change shape (comformational change)voltage gated dihydropyridine (DHP) receptors
what do the DHP receptors attach to calcium realeas channels (ryanodine receptors)
what is hyperropyincrease in size of a cell tissue or an organ
what is hyperplasiaincrease in the number of fibers
what is atrophyreduction in size of a cell, tissue, or organ
what is fibrosisreplacement of normal tissue with heavy fibrous connective tissue