alleryStart learning →The absolute refractory period arises because sodium channels are
APumping sodium back outward
BStuck in an inactivated state
CBlocked by potassium ions
DHeld wide open by voltage
Answer & Solution
Correct answer: B. Stuck in an inactivated state
Inactivated sodium channels cannot reopen whatever the voltage, so no new spike can fire.
Keep practising Neural Control and Coordination
Browse all Neural Control and Coordination questions for NEET UG, or explore more Biology topics.
Related questions
During sympathetic activity, blood flow to the gut and skin isStimulation of the adrenal medulla releases into the bloodstreamThe rest and digest response is promoted by theWhich brain structure acts as an integrator for autonomic functions?Which part of the nervous system is called the second brain of the body?At most effector organs, sympathetic postganglionic neurons releaseThe preganglionic neurotransmitter of both sympathetic and parasympathetic divisions isCirculating epinephrine during sympathetic activity makes the bronchioles