Biology, 22.09.2019 05:30 rosa1423

Neuron is stimulated, the membrane potential of the plasma membrane shifts to a less negative value by opening voltage-gated k+ channels:
(a) true
(b) false

Answers: 3

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Answer from: kieraweems2034

False.

Explanation:

Neuron or nerve cell may be defined as the structural and functional unit of the nervous system. The stimulation of nerve helps in the transmission of messages in the body.

Th resting membrane potential of the plasma membrane is -70mV. The maintenance of negative membrane potential is due to the presence of potassium ions. The influx of potassium ions makes the membrane more negative and influx of sodium ions makes the membrane potential less negative.

Thus, the answer is false.

Answer from: anonymousanon

B. False

Explanation:

Resting potential: When a nerve fiber is at rest, it is observed that the outer surface is positively charged and inner surface is negatively charged. This is due to differential distribution of ions (Na+ and K+) and negatively charged protein inside the cell.

Na+ ions are more outside the cell whereas K+ ions are more inside the cell. The potential difference across the membrane under resting condition was -70 mV and is called resting potential.

When the cell is at rest, both Na+ and K+ voltage gated channels are closed. When a threshold stimulus is applied, the voltage gated Na+ channels open up, allowing Na+ ions to enter the neuron. This causes the neurons interior to develop a positive charge. The membrane is said to be depolarized and the action potential of +30 mV is obtained.

Answer from: Quest

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.

Answer from: Quest

The correct answer to this question would be c

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Neuron is stimulated, the membrane potential of the plasma membrane shifts to a less negative value...