Question

question 25 1 pts movement of the membrane potential away from zero (below the usual rmp) is called hypopolarization. hyperpolarization. repolarization. depolarization. question 26 1 pts whether an impulse is continued through the neuron depends on the magnitude of the voltage in the axon hillock. true false question 27 1 pts when neurotransmitters from synaptic knobs stimulate a postsynaptic neuron in rapid succession, their effect can add up over a brief period to produce an action potential. this is called twitch. temporal summation. spatial summation. tetanus.

Explanation:

• For Question 25: Hyperpolarization is the movement of the membrane potential away from zero and below the usual resting - membrane potential (RMP). Hypopolarization is not a standard term in this context. Repolarization is the return to the resting membrane potential after depolarization, and depolarization is the movement of the membrane potential towards zero.
• For Question 26: The decision of whether an impulse is propagated through the neuron depends on whether the voltage in the axon hillock reaches the threshold potential. If the magnitude of the voltage in the axon hillock is sufficient to reach the threshold, an action potential will be generated and the impulse will continue.
• For Question 27: Temporal summation occurs when neurotransmitters from synaptic knobs stimulate a postsynaptic neuron in rapid succession, and their effects add up over a brief period to produce an action potential. Spatial summation involves the combined effect of neurotransmitters from multiple presynaptic neurons. Twitch is related to muscle contractions, and tetanus is a bacterial - induced muscle condition.

Answer:

Question 25: B. hyperpolarization
Question 26: A. True
Question 27: B. temporal summation