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liq [111]
3 years ago
14

When two excitatory postsynaptic potentials (EPSPs) occur at a single synapse so rapidly in succession that the postsynaptic neu

ron's membrane potential has not returned to the resting potential before the second EPSP arrives, the EPSPs add together, producing
A. spatial summation
B. temporal summation
C. tetanus
D. the refractory state
Biology
1 answer:
Aliun [14]3 years ago
6 0

Answer:

temporal summation

Explanation:

Temporal summation occurs when stimuli are applied to the same axon in rapid succession. These back to back stimuli cause overlapping EPSPs that sum. Temporal summation requires the buildup of neurotransmitter released by a single presynaptic end bulb two or more times in rapid succession that does not allow the postsynaptic neuron's membrane potential to return to the resting potential. The resultant postsynaptic potentials sum. A typical EPSP lasts about 15 msec. Therefore, temporal summation occurs when the second release of neurotransmitters occurs soon after the first one so that the postsynaptic neuron does not acquire resting potential.

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Two species of tree frogs that live sympatrically in the northeastern United States differ in ploidy: Hyla chrysoscelis is diplo
Artist 52 [7]

Answer:

The correct answer is - polyploidy.

Explanation:

Speciation can be two types allopatric and sympatric speciation. Sympatric speciation is the process of speciation is developing the new species that diverged from the common ancestral species while the ancestral and developed species both can share the same place or geological area. The main cause of such speciation is due to the change in their genetic level more than environmental conditions.

In this case, the frog's species show differences in their ploidy level as well as their mating call but polyploidy is the most likely the difference that evolved first rather than females call for mating.

Thus, the correct answer is - polyploidy.

5 0
3 years ago
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Sati [7]
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How will an intravenous catheter obstructed by blood clots or kinking affect central venous pressure in dogs?
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It will give a false reading of the central venous presure.

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8 0
3 years ago
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Answer: A scenario often presented to introductory physics classes is that of a "gravity tunnel" — a tube drilled from one side of the Earth to the other through the planet's center. The answer taught for nearly a half-century for how long a fall through such a hole would take was about 42 minutes and 12 seconds.

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