muscle

58問 • 2年前

問題一覧

muscle tissue, one of the four principle types of tissue, consists chiefly of muscle cells that are highly specialised for

contraction

which of the following is not a type of muscle tissue

vascular

skeletal muscle tissue forms skeletal muscles, organs that also contain each of the following except

bones

each cell in skeletal muscle tissue is a

single muscle fibre

skeletal muscles perform each of the following functions excepr

moves contents of the digestive tract

during development, groups of ? fuse together to form individual skeletal muscle fibres

myoblasts

what is another name for the cell membrane of a muscle fibre

sarcolemma

elextrical implieses (action potential) travel down ? into the muscle cells to efficiently trigger muscle fiver contraction

transverse tubules

what is the name for the cylindrical structures which can actively shorten and this are responsible for skeletal muscle fibre contraction

myofibrils

myofibrils consist of bundles of ? which are protein filaments composed primarily of thin filaments and thick filaments

myofilaments

the ? is an intracellular membrane complex, containing Ca2+ ions

sarcoplasmix reticulum

? ions are released into the sarcoplasm on receiving electrical signals

calcium (Ca2+)

myofilaments are organised into repeating functional units called ?

sarcomeres

a sarcomere contains each of the following except

proteins that regulate generation of thick and thin filaments

visually, when viewed microscopically, the sarcomeres have a banding pattern of A bands with a ? at the centre

M line

in the ? thin filaments are situated between the thick filaments and they can slide across each other during contraction

zone of overlap

strands of the protein ? function to keep the thick and thin filaments in proper alignment, helps resist extreme stretching, and returns stretched muscles to resting length

titin

a strand of the protein ? lies alongside thin filaments, which helps align thin filaments of the sarcomere

nebulin

under resting conditions, interaction between thick and thin filaments and this muscle fibre contraction is prevented by the ? complex

troponin- tropomyosin

muscle fibre contraction involves the interaction of ? of the thick filaments with binding sites on the thin filaments

myosin heads

which strands are part of the thin filament and function to cover active sites thus preventing actin-myosin interactions

tropomyosin

how many subunits does troponin molecule have

when a skeletal muscle contracts

the width of the A band remains constant

during contraction, thin filaments slide towards the centre of each sarcomere alongside the thick filaments and sliding occurs in every sarcomere along a myofibril, thus the

myofibril gets shorter

the model representing the physical changes that occur, which describes what happens to the sarcomere during contraction is called the

sliding filament theory

normal skeletal muscle contraction only occurs when skeletal muscle fibres are activated by motor neurons resulting in so called

excitation-contraction coupling

the first step in muscle contraction is the release of ? into the sarcoplasm

calcium ions

after release from the sarcoplasmic reticulum, ions then trigger interactions between ? resulting in muscle fibre contraction

thick and thin filaments

interactions during contraction produce ? and consume energy

tension

when sarcomere shorten in a contraction, they ? the muscle fibre

shorten

? produced by an i social muscle fibre, or indeed an entire skeletal muscle, can vary widely and can change moment to moment

tension

a muscle fibre is either contracting or relaxed, this is the ? and whje a fibre contracts it does so fully

all or non principle

a single stimulus contraction relaxation sequence in a muscle fibre is called a twitch, which can be measured as a

myogram

which of the following can not be used to describe part of a single twitch

tetanic phase

if a skeletal muscle is stimulated a second time immediately after the relaxation phase has ended the force will rise, if this happens repeatedly force rises like steps in a staircase, a phenomenon called

treppe

if a second stimulus arrives before the relaxation phase has ended a second more powerful contraction occurs which is referred to as

wave summation

? is induced in muscle when the stimulation rate is increased so much that the relaxation phase is completely eliminated

complete tetanus

which of these is not one of theee major types of skeletal muscle fibre

resistant

what is generally considered in terms of power and endurance

muscle performance

what functions of skeletal muscle is least dependent on its connections to other tissues

heat generation

which muscle type does not contract spontaneously

skeletal muscle

what is the role of Ca2+ in the muscle action potential?

none - Ca2+ only regulates contraction

what is the role of T tubules in skeletal muscle function

ensure the muscle is exxited as quickly and evenly as possible

a motor unit containing few muscle fibres produces

fine movement

curare completely blocks cholinergic transmission at the neuromuscular junction. it will therefore cause

complete paralysis and relaxation

when a whole motor nerve is stimulated electrically, increasing strength of stimulus causes the muscle to contract more strongly. why is the all or non law apparently not obeyed

a motor nerve contains many motor units. greater stimulation causes additional motor units to become active

which organs are capable of generating heat

skeletal muscle only

what component of sarcomere does the I band represent

the portion of thin filaments not overlapping with thick filaments

which of the following correctly describes the sarcomere during contraction

A band constant, I band gets smaller, Z lines I’ve closer together

if a muscle is stretched until the zone of overlap disappears

it can no longer contract

at the molecular level, the energy source for contraction is

ATP

the energy dependent rotation of the myosin head during muscle contraction is responsible for

pusing the actin filament

what is the first step in the contraction of a skeletal muscle fibre

an action potential is triggered at the neuromuscular junction

what is the role of the sarcoplasmic reticulum in skeletal muscle

store Ca2+ and release it when triggered by an action potential

during excitation contraction coupling, troponin bonds Ca2+. how does this enable contraction to occur

troponin causes tropmyosin to expose the myosin binding site on the Acton filament

while Ca2+ is present in the sarcoplasmix reticulum

the muscle will continue to contract

during peak activity muscles cannot generate enough ATP from oxygen dependent metabolism. what happens?

energy is derived from oxygen independent mechanisms

accumulation of lactic acid in contracting skeletal muscle is also called the ‘oxygen debt’. what does this mean

lactic acid is a waste product of oxygen I depend glucose metabolism. it is converged back into glucose during recovery, consuming oxygen

concepts

concepts

nervous

nervous

reproductive

reproductive

renal

renal

gastro

gastro

endocrine

endocrine

respiratory

respiratory

bodily fluids

bodily fluids

cardiovascular

cardiovascular

問題一覧

muscle tissue, one of the four principle types of tissue, consists chiefly of muscle cells that are highly specialised for

contraction

which of the following is not a type of muscle tissue

vascular

skeletal muscle tissue forms skeletal muscles, organs that also contain each of the following except

bones

each cell in skeletal muscle tissue is a

single muscle fibre

skeletal muscles perform each of the following functions excepr

moves contents of the digestive tract

during development, groups of ? fuse together to form individual skeletal muscle fibres

myoblasts

what is another name for the cell membrane of a muscle fibre

sarcolemma

elextrical implieses (action potential) travel down ? into the muscle cells to efficiently trigger muscle fiver contraction

transverse tubules

what is the name for the cylindrical structures which can actively shorten and this are responsible for skeletal muscle fibre contraction

myofibrils

myofibrils consist of bundles of ? which are protein filaments composed primarily of thin filaments and thick filaments

myofilaments

the ? is an intracellular membrane complex, containing Ca2+ ions

sarcoplasmix reticulum

? ions are released into the sarcoplasm on receiving electrical signals

calcium (Ca2+)

myofilaments are organised into repeating functional units called ?

sarcomeres

a sarcomere contains each of the following except

proteins that regulate generation of thick and thin filaments

visually, when viewed microscopically, the sarcomeres have a banding pattern of A bands with a ? at the centre

M line

in the ? thin filaments are situated between the thick filaments and they can slide across each other during contraction

zone of overlap

strands of the protein ? function to keep the thick and thin filaments in proper alignment, helps resist extreme stretching, and returns stretched muscles to resting length

titin

a strand of the protein ? lies alongside thin filaments, which helps align thin filaments of the sarcomere

nebulin

under resting conditions, interaction between thick and thin filaments and this muscle fibre contraction is prevented by the ? complex

troponin- tropomyosin

muscle fibre contraction involves the interaction of ? of the thick filaments with binding sites on the thin filaments

myosin heads

which strands are part of the thin filament and function to cover active sites thus preventing actin-myosin interactions

tropomyosin

how many subunits does troponin molecule have

when a skeletal muscle contracts

the width of the A band remains constant

during contraction, thin filaments slide towards the centre of each sarcomere alongside the thick filaments and sliding occurs in every sarcomere along a myofibril, thus the

myofibril gets shorter

the model representing the physical changes that occur, which describes what happens to the sarcomere during contraction is called the

sliding filament theory

normal skeletal muscle contraction only occurs when skeletal muscle fibres are activated by motor neurons resulting in so called

excitation-contraction coupling

the first step in muscle contraction is the release of ? into the sarcoplasm

calcium ions

after release from the sarcoplasmic reticulum, ions then trigger interactions between ? resulting in muscle fibre contraction

thick and thin filaments

interactions during contraction produce ? and consume energy

tension

when sarcomere shorten in a contraction, they ? the muscle fibre

shorten

? produced by an i social muscle fibre, or indeed an entire skeletal muscle, can vary widely and can change moment to moment

tension

a muscle fibre is either contracting or relaxed, this is the ? and whje a fibre contracts it does so fully

all or non principle

a single stimulus contraction relaxation sequence in a muscle fibre is called a twitch, which can be measured as a

myogram

which of the following can not be used to describe part of a single twitch

tetanic phase

treppe

if a second stimulus arrives before the relaxation phase has ended a second more powerful contraction occurs which is referred to as

wave summation

? is induced in muscle when the stimulation rate is increased so much that the relaxation phase is completely eliminated

complete tetanus

which of these is not one of theee major types of skeletal muscle fibre

resistant

what is generally considered in terms of power and endurance

muscle performance

what functions of skeletal muscle is least dependent on its connections to other tissues

heat generation

which muscle type does not contract spontaneously

skeletal muscle

what is the role of Ca2+ in the muscle action potential?

none - Ca2+ only regulates contraction

what is the role of T tubules in skeletal muscle function

ensure the muscle is exxited as quickly and evenly as possible

a motor unit containing few muscle fibres produces

fine movement

curare completely blocks cholinergic transmission at the neuromuscular junction. it will therefore cause

complete paralysis and relaxation

when a whole motor nerve is stimulated electrically, increasing strength of stimulus causes the muscle to contract more strongly. why is the all or non law apparently not obeyed

a motor nerve contains many motor units. greater stimulation causes additional motor units to become active

which organs are capable of generating heat

skeletal muscle only

what component of sarcomere does the I band represent

the portion of thin filaments not overlapping with thick filaments

which of the following correctly describes the sarcomere during contraction

A band constant, I band gets smaller, Z lines I’ve closer together

if a muscle is stretched until the zone of overlap disappears

it can no longer contract

at the molecular level, the energy source for contraction is

ATP

the energy dependent rotation of the myosin head during muscle contraction is responsible for

pusing the actin filament

what is the first step in the contraction of a skeletal muscle fibre

an action potential is triggered at the neuromuscular junction

what is the role of the sarcoplasmic reticulum in skeletal muscle

store Ca2+ and release it when triggered by an action potential

during excitation contraction coupling, troponin bonds Ca2+. how does this enable contraction to occur

troponin causes tropmyosin to expose the myosin binding site on the Acton filament

while Ca2+ is present in the sarcoplasmix reticulum

the muscle will continue to contract

during peak activity muscles cannot generate enough ATP from oxygen dependent metabolism. what happens?

energy is derived from oxygen independent mechanisms

accumulation of lactic acid in contracting skeletal muscle is also called the ‘oxygen debt’. what does this mean

lactic acid is a waste product of oxygen I depend glucose metabolism. it is converged back into glucose during recovery, consuming oxygen