Multiple Choice
What ions rush into a neuron during depolarization?
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11. Nervous Tissue and Nervous System
Ions - Sodium and Potassium
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Which of the following elements is necessary for proper conduction of nerve impulses?
A
Sodium
B
Iron
C
Magnesium
D
Calcium
Verified step by step guidance1
Step 1: Begin by understanding the role of nerve impulses in the body. Nerve impulses are electrical signals that travel along neurons to transmit information. These impulses rely on the movement of ions across the cell membrane to generate and propagate the signal.
Step 2: Learn about the key ions involved in nerve impulse conduction. Sodium (Na⁺), potassium (K⁺), and calcium (Ca²⁺) are the primary ions that play a role in this process. Sodium is particularly important for initiating the action potential, which is the electrical signal in neurons.
Step 3: Explore the mechanism of action potential generation. During the depolarization phase of an action potential, sodium channels open, allowing sodium ions to rush into the neuron. This influx of sodium ions causes the inside of the neuron to become more positive, triggering the nerve impulse.
Step 4: Compare the roles of the other elements listed in the question. Iron is primarily involved in oxygen transport via hemoglobin, magnesium is important for enzyme function and muscle relaxation, and calcium is involved in neurotransmitter release and muscle contraction. While calcium plays a role in nerve function, sodium is directly necessary for the conduction of nerve impulses.
Step 5: Conclude that sodium is the correct answer because it is essential for the depolarization phase of the action potential, which is the fundamental process for nerve impulse conduction.
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