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Biology 1161 Final exam with 100- correct answers.
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Biology 1161 Final exam with 100- correct answers.
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Biology 1161Final exam with
100% correct
answers
Excitability (irritability) - answer ability to receive and
respond to a stimulus
Contractility - answer ability to shorten forcibly when
adequately stimulated
Extensibility - answer the ability to be stretched or
extended
Elasticity - answer the ability to recoil and resume its
resting length after being stretched
Functions of muscles - answer produce movement,
maintain posture, stabilize joints, generate heat
,actin and myosin filaments - answer actin (thin) and
myosin (thick)
cross bridges - answer The linking of the actin and myosin
filaments together
Tropomysin - answer Rod shaped protein; blocks the
myosin binding site to the thin filament
Troponin - answer A protein on the actin filaments that
binds calcium to move tropomysin away from actin
elastic filaments composed of titin - answer Allow for
muscle cell to return to its original shape after being
stretched and holds thick, myosin filaments in place
Role of Ach in skeletal muscle contraction - answer
Acetylcholine (ACh) - answer Neurotransmitters released
from axon at the neuromuscular junction
Nervus stimulus and events - answer Diffuses across the
synaptic cleft and attaches to ACh receptors on the
sarcolemma of a muscle cell
Opens a Na+ / K+ channel and initiates an action potential
which travels along the sarcolemma and down the T
tubules
, nervous stimulation - answer Transmission of the action
potential down the T tubule to cause calcium to be
released from the sarcoplasmic reticulum into the cytosol
Calcium binds to troponin which removes it from the
binding site on the tropomysin molecule
Cross bridge between actin and myosin can form
How is atp used in skeletal muscle contraction - answer It
causes the cross bridge detachment of actin and myosin
Sliding filament theory of muscle contraction:4 events
occur in rapid succession - answer Cross bridge formation
The power (working) stroke
Cross bridge detachment
"Cocking" of the myosin head
*ATP is required
I DONT THINK I CAN Get up to go to class is YES OR NOT
due to lack of ATP - answer Not
Muscle fatigue - answer a state of physiological inability of
a muscle to contract.
Muscle may still be receiving stimulation
May be due to lack of ATP or Contractures
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