The neuron is said to be polarized when the:
Correct answer: A. Inside the plasma membrane has a negative energy compared to the outside
- A. Inside the plasma membrane has a negative energy compared to the outside
- B. Inside of the plasma membrane has a positive energy compared to the outside
- C. Inside the plasma membrane has the same energy compared to the outside
- D. Positive charge moves inside the neuron
Explanation
Neurons are said to be polarized when there is a difference in electrical potential between the inside and outside of the plasma membrane. This is known as the resting potential. In a polarized neuron, the inside of the plasma membrane has a negative electrical charge (about -70 millivolts) compared to the outside. This is due to a higher concentration of potassium ions (K+) inside the cell and a higher concentration of sodium ions (Na+) outside the cell. The negative charge inside the cell is also maintained by the selective permeability of the plasma membrane, which allows potassium ions to leave the cell more easily than sodium ions can enter.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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