Biology Questions and Answers
axon until reaching the synapse at the
neuromuscular jimpulse passage zunction (tone between the axonhe neural (^)
extremity and the sarcolemma). Near
the axonal extremity thallows the entrance of calcium ioe depolarizationns into (^)
the axon (note that calcium also has a
relevant rstimulate thole here). The calciume neuron to release ions
acetylcholine in the synapse.
Acetylcholinreceptors in the outer surface of thee then binds to special (^)
sarcolemma, thmembrane is altere permeabilityed and an action of this
potential is createis then conduced along the sarcolemmad. The depolarization (^)
to the sarcoplasmic reticulum that thus
releases calcium ions fcontraction. or the sarcomere
- To increase the strength of
the muscle work is the muscle
contraction intensely
increased?
An increase muscle work is nin the strength of theot achieved by increase (^)
in the intensity of the stimulation of
each muscle fobeys an all-or-niber. The muscle fiothing rule, i.e., berits (^)
contraction strength is only one and
cannot be increased.
When the body needs to increase the
strength of the muscle work aphenomenon known as spatial (^)
summation occurs: new muscle fibers
are recruited already in action. So thin addition to e strength of thethe fibers (^)
muscle contraction increases only when
the number of active mincreases. uscle cells
- What is the difference
between spatial summation
and temporal summation of
muscle fibers? What is tetany?
Spatial summation is the recruiting of
new muscle fimuscle strengtbers to ih. Temporal ncrease thsummatione (^)
occurs when a muscle fiber is
continuously stimulated without being able to concludeto contract
relaxation.
The permanence of a muscle fia continuous state of contractionber under by
temporal summation (e.g., the clinical condition ois known as tetanyf patients
contaminated by the toxin of the
tetanus bacteria). Tavailable energy for contraction is spetany ends when allent (^)
or when the stimulus ceases.
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