WorksheetsMuscle Physiology
Total questions: 15
Worksheet time: 8mins
Myofibrils are composed primarily of
actin and myosin
ATP and ADP
Troponin
Tropomyosin
When a muscle undergoes atrophy in response to disuse,
The number of mitochondria decrease
There is reduction in capillary networks
The size of actin and myosin fibers decrease
All of the above
Neurotransmitters are stored in vesicles within
motor units
motor neuron endings
myofibrils
motor end plates
The botulinus toxin that causes botulism acts by
preventing the release of acetylcholine
promoting the release of acetylcholine
Preventing decomposition of acetylcholine
none of the above
The enzyme cholinesterase causes acetylcholine to
be secreted from the motor end plate.
form cross bridges.
bind to actin.
decompose.
What chemical helps to regenerate ATP?
acetylcholine
cholinsterase
creatine phosphate
ADP
Skeletal muscles are responsible for moving
The heart
The skeleton
the pancreas
The brain
Which of the following muscle types are voluntary?
Skeletal
Cardiac
Smooth muscle
What are the three types of muscles?
voluntary, smooth, cardiac
cardiac, skeletal, nervous
cardiac, smooth, skeletal
smooth, cardiac, stomach
Which cell organelle provides energy for muscle contraction?
lysosome
nucleus
endoplasmic reticulum
mitochondria
A person who has a disease that inhibits the production of cholinesterase would have what kind of symptoms?
prolonged muscle contraction
flacid muscles
inability to speak
paralyzed
During a muscle contraction, cross-bridges from between what two structures?
Actin and myosin fibers
neuron and muscle
mitochondria and actin
Vesicles in the motor neuron store what substance?
cholinsterase
acetylcholine
calcium
curare
When recruitment occurs, the number of motor units being activated
increases
decreases
Muscle fatigue is likely due to the build up of
acetylcholine
cholinsterase
lactic acid
glucose
