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A/P I: Unit III: muscle physiology
Everything besides definitions
43
Anatomy
Undergraduate 2
11/09/2009

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Term
General structure of a muscle fiber
Definition
Single cell consisting of a cell membrane, cytoplasm, several nuclei and myofibrils.
Term
Sarcoplasm
Definition
all cellular material outside the nuclei
Term
Sarcolemma
Definition
cell membrane of the muscle fiber
Term
Bound by Z disks that hold actin myofilaments
Definition
Sarcomeres
Term
I Band
Definition
Light band of a striated muscle where Actin filament is attached to Z disk and not overlapping another filament.
Term
H zone
Definition
Light band of a striated muscle where myosin is not overlapping an actin filament, muscle is relaxed.
Term
A Band
Definition
Dark band of a striated muscle where actin and myosin overlap
Term
endomysium
Definition
wraps single muscle fiber
Term
fascicle
Definition
several muscle fibers bound together by preimysium
Term
perimysium
Definition
wraps several fibers into a bundle called a fascicle
Term
fascia
Definition
very dense fibrous connective tissue used for attachment, helps bind muscles into groupings
Term
prime mover
Definition
major/principle muscle within a muscle group
Term
Functions of Muscular System
Definition
Body movement
Maintenance of position
respiration
production of body heat
communication
constriction of organs and vessels
heart beat
Term
properties of a muscle
Definition
contractility
excitability
extensibility
elasticity
Term
3 Basic muscle types
Definition
skeletal
cardiac
smooth
Term
troponin
Definition
binding site on actin molecule for caclium
Term
tropomysi
Definition
protects or covers ative sites within actin strands
Term
thin filament
Definition
actin
Term
thick strand
Definition
myosin
Term
sarcomeres shorten
Definition
contraction
Term
sarcomeres lengthen
Definition
relaxation
Term
Disappears during sarcomere shortening
Definition
H zone
Term
Cause striations in myofibrils
Definition
A Bands and I Bands
Term
Storage site for calcium in a muscle fiber
Definition
sarcoplasmic reticulum (SR)
Term
three sources of energy for muscle contraction
Definition

creatine phosphate

aerobic respiration

fermentation

Term
creatine phosphate
Definition

short term muscle contraction energy source

stores do not last long, typically 15-20 seconds

Term
aerobic respiration
Definition
most efficient form of ATP generation
Term
fermentation
Definition
occurs in absence or reduced state of oxygen and results in breakdown of glucose to yield ATP and lactic acid
Term
three types of fatigue
Definition

psychological

muscular

synaptic

Term
psychological fatigue
Definition
fatigue that is a result of the emotional state of the individual
Term
muscular fatigue
Definition
fatigue that results from ATP depletion
Term
synaptic fatigue
Definition
fatigue that occurs in the neuromuscular junction due to a lack of acetylcholine
Term
smooth muscle subtypes
Definition

visceral

multiunit

Term
visceral smooth muscle
Definition

functions as a unit due to gap junctions between cells

 

contract slowly and may be autorhythmic

Term
multiunit smooth muscle
Definition

cells or groups of cells that act as independent units

 

contract rapidly

Term
external initiation of smooth muscle
Definition
ligand binding to a g-protein
Term
external initiator of skeletal muscle
Definition
Acetylcholine binding to a nicotinic receptor
Term
internal initiator for skeletal muscle
Definition
Calcium binding to troponin
Term
internal initiator for smooth muscle
Definition
calcium binding to calmodulin
Term
where ATP is used in skeletal muscle
Definition
relaxation
Term
where ATP is used in smooth muscle
Definition
contraction
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