Muscles Flashcards
Calcium is stored in what part of muscle fiber
smooth ER
In smooth muscle, Ca++ binds to
CALMODULIN (no troponin)
muscle that aids the prime mover
synergist
lastissumus dorsi (agonist or antagonist)
antagonist (extension)
muscles have single or multiple nucleus
multinuclear
membrane that surrounds entire muscle
epimysium
what system controls the heart
ANS
irreversible atrophy
muscle turns to collagen
muscle that produces the most force during a particular joint action
agonsit (prime mover)
no motor neurons exist in cardiac, skeletal or smooth muscle
smooth muscle
how is smooth muscle controlled
ANS
cardiac muscle contracts via
SA node
shorter and thicker sarcomeres exist in (cardiac or skeletal)
cardiac muscle
pectoralis major (agonist or antagonist)
agonist (flexion)
what type of muscle does not have motor neuron innervation
cardiac muscle
an alternate source of energy used by the cardiac muscle in times of oxygen interruption
lactic acid
sarcomeres are not found in what muscle type
smooth
muscle myofilaments consist of
actin and myosin
one neuron + all muscle fibers it innervates
motor unit
membrane surrounds individual muscle fiber
endomysium
Motor unit can be defined as
of muscle cells controlled by 1 nerve cell
how does the cardiac muscle make ATP
oxygen
load is moved in what type of muscle contraction (isometric or isotonic)
isotonic
muscle that opposes the prime mover
antagonist
Part of muscle that conducts nerve signals (action potentials) into and excites sarcoplasmic reticulum
T-tubules in sarcolemma (cell membrane of muscle fiber)
enzyme activated by CALMODULIN
light chain myokinase
What muscle attachment is relatively mobile
insertion (typically distal)
extensors are located on what side of the body
dorsal (except knee)
light chain myokinase
phosphorylates myosin
Motor neurons innervate what type of muscles
skeletal muscles
sarcomeres in what muscle type (smooth, cardiac, skeletal)
skeletal and cardiac (NOT smooth)
L.M.N. muscle
skeletal; smooth (sometimes)
Fives ways to learn muscles
location shape direction (fibers) # heads (ceps) size
large motor unit is defined as
one neuron + many non-specific muscle cells
calcium contributes to what functions
muscle contraction
nerve conduction
heartbeat
clotting
bones
calcium is released from sarcoplasmic reticulum when
signal received action potential that travels down t-tubule
Rough ER is involved in the synthesis of
proteins
muscles push or pull or both
pull only
large motor units are responsible for what type of movements
gross motor movements (posture, muscle tone)
Muscle is a considered an
organ
less developed SR exists in cardiac or skeletal muscle
cardiac
Rough ER produces proteins involved in what type of functions
export
Three types of muscles
smooth, cardiac, skeletal
Action potentials come from
motor neuron
response where muscle is able to be stretched but adapt to its new length (retains ability to contract)
stress-relaxation response in smooth muscle
when bringing the muscle back down, tension is still constant but the muscle is lengthening (name of contraction)
eccentric contraction
Sarcoplasmic reticulum is a reservoir for
Ca ++
reversible atrophy
can build
Three characteristics of muscle tissue
Sends action potential
Contracts
Stretches
when you first begin to lift a dumbbell with your arm (name of contraction)
isometric contraction
slow, low force, wave-like, continuous contractions in cardiac, smooth or skeletal muscle
smooth
no sarcomeres exist in cardiac, skeletal or smooth muscle
smooth muscle
the turning off and on of motor units is responsible for
muscle tone
Smooth ER is involved in the synthesis of
lipids
What is the prime mover
agonist
Membrane of muscle fiber
sarcolemma
Striation of muscle depends on
arrangement of myofilaments
Cytoplasm of the muscle fiber
sarcoplasm
concentric contraction
isotonic, load is moved and muscle shortens
type of muscle in the digestive tract, urinary tract, cardiovascular system, respiratory system, reproductive system
smooth muscle
hypertrophy
muscle cells enlarge, more myofibrils
Name the two points of muscle attachment
origin and insertion
muscle contraction where muscles do not shorten
isometric
serve as gap junctions and mechanical junctions in cardiac muscle
intercalated disks
Infoldings of sarcolemma
T-tubules
flexors are located on what side of the body
ventral (except knee)
what muscle types(s) can regenerate
smooth muscle, skeletal (not well)
tension increases in what type of contraction
isometric
t-tubules are larger in skeletal or cardiac muscle
cardiac
A joint can move only if
a muscle crosses the joint
what is admitted into the muscle from extracellular fluid (in cardiac muscle)
Ca++
Ca++ diffuses into what muscles from extracellular fluid
smooth and cardiac
small motor units are responsible for what type of movements
fine motor movements (fingers, eyes)
atrophy
smaller muscle cells due to non-use, lack of innervation, loss of myofibrils
Muscle sit underneath what layers
skin (epidermis and dermis)
hypodermis
deep fascia
constant tension
isotonic
no T-tubules and very little SR in cardiac, smooth or skeletal muscle
smooth
Smooth ER of a muscle fiber
sarcoplasmic reticulum
muscle contraction where muscles do shorten
isotonic
small motor unit
one neuron + few specific muscle cells
what muscle contains more mitochondria (smooth, cardiac or skeletal)
cardiac
Surrounds fascicle
perimysium
Collection of muscle fibers
muscle fascicle
prevents cells from coming apart during contraction and directly stimulates its neighbors
intercalated disks
muscle that prevents a bone from moving
fixator (i.e. scapula prevented from moving when biceps move radius)
Action potentials comes from what
motor neuron
Muscle is composed of
fascicles > fibers (cell) > myofibrils > myofilaments
What muscle attachment does not move
origin (typically proximal)
myocardium, aorta, vena cava are made from what type of muscle
cardiac
muscle type that appears as shorter fibers with transverse striations running parallel and connected by complex junctions, single, central nucleus
cardiac
activity of what muscle type with strong, quick, continuous rhythmic contractions
cardiac
stimulation of this muscle type that is involuntary; intrinsically stimulated and propagated; modified by ANS
cardiac
stimulation of this muscle by ANS or enteric nervous system
smooth
walls of hollow viscera and blood vessels, iris, and ciliary body of the eye, attached to hair follicles of the skin (arrector muscle)
smooth
activity of muscle that is intermitent contraction above a baseline tonus; acts to produce movement (isotonic) through shortening (concentric) or controlled relaxation (eccentric), maintain position against gravity or other resistance without force (isometric)
skeletal
stimulation by somatic nervous system
voluntary