ch 11 hw answers Flashcards
ex of the characteristics of muscle
excitability
placing a muscle in a solution containing calcium and ATP
ex of the characteristics of muscle
conductivity
- action potentials in the center of the fiber radiating to the ends
- depolorization of a single muscle fiber causing depoloarization of adjacent muscle fibers
ex of the characteristics of muscle
contractility
- creation of force
- pulling two bones closer together
- actively resisting the seperation of two bones
ex of the characteristics of muscle
elasticity
- a stretched muscle returning to its orginal length
- passively resisting the seperation of 2 bones
ex of the characteristics of muscle
extensibility
- stretching a muscle
- incresing sarcomere length
ranking muscles by strength
strongest to weakest
- quadriceps femoris
- gastrocnemius
- brachialis
- orbicularis oculi
- lateral rectus
classifying the components of thick and thin myofilaments
thick filaments
- myosin heads
- myosin
classifying the components of thick and thin myofilaments
thin filaments
- tropomyosin
- troponin
- active sites
- actin
classifying the components of thick and thin myofilaments
neither thick nor thin filaments
- elastic filament
- dystrophin
classifying the components of the neuromuscular junction by location
motor end plate
- acetylcholine receptors
- acetylcholinesterase
- postsynaptic membrane folds
- sarcolemma
- sarcoplasm
classifying the components of the neuromuscular junction by location
axon terminal
- synaptic vesicles filled with acetylcholine
- myelin
- voltage-gated Ca2+ channels
place the events of excitation of a skeletal muscle fiber in order
- calcium ions enter the axon terminal through voltage-gated channels
- ACh is released into the synaptic cleft
- ACh diffuses across the synaptic cleft and binds to receptors on the sarcolemma
- Na+ ions enter and K+ ions leave the cell creating an end-plate potential
- an action potential is generated in the adjacent sarcolemma
applying disruptive scenarios to their effects on muscle contraction
no contraction
- active transport of CA2+ into the sarcoplasmic reticulum
- a mutation to troponin that prevents it from binding Ca2+
- a mutation to tropomyosin that prevents it from binding tropnin
- an inhibior of voltage-gated Na+ channels
applying disruptive scenarios to their effects on muscle contraction
contraction
- release of acetylcholine
- a mutation to tropomyosin that prevents it from binding actin
- presence of an organophosphate pesticide that inhibits acetylcholinesterase
- opening of calcium ion channels in the terminal cisterns
- exposure of the active sites on the actin filament
classifying ex of isotonic and isometric contractions
isotonic contraction
- a sprinter leaves the starting block
- a mother lowers an infant into their crib
classifying ex of isotonic and isometric contractions
isometric contractions
- a person holds open a door for their date
- this begins when a weightlifter pulls on a barbell and ends the moment the barbell leaves the floor
Classifying Concentric/Eccentric Contractions as Flexion or Extension
extension
- concentric contraction of gluteus maximus
- latissimus dorsi contracting with greater force than the pectoralis major and anterior deltoid
- eccentric contraction of rectus abdominis
- concentric contraction of erector spinae
- eccentric contraction of iliopsoas
- quadriceps contracting with greater force than the knee flexors
Classifying Concentric/Eccentric Contractions as Flexion or Extension
flexion
- concentric contraction of biceps femoris
- eccentric contraction of vastus lateralis
- concentric contraction of brachialis
- triceps brachii contracting with less force than the elbow flexors
Classifying Activities of Daily Living by their Muscles’ Energy Source
phosphagen system
- jumping on the bed
- swatting at a mosquito
Classifying Activities of Daily Living by their Muscles’ Energy Source
glycogen-lactic acid system
running up a couple flights of stairs
Classifying Activities of Daily Living by their Muscles’ Energy Source
aerobic respiration supported by cardiopulmonary function
- sitting upright at your desk writing a report
- walking across campus
- standing while giving a classroon presentation
classifying atheletic activities by their muscles’ energy source
phosphagen system
- during a soccer game, jumping up to head a ball
- pitching a baseball
- swinging a golf club