Final answer:
Axons are long projections of nerve cells that carry electrical signals away from the cell body. They are essential for communication within the nervous system. Two true statements are that nerve cells have long axons and that electrical signals travel along these axons.
Explanation:
Understanding Axons
Axons are a crucial component of nerve cells, known as neurons. Let’s evaluate the statements provided:
- Nerve cells have a long axon: This statement is true as many neurons possess long axons that help transmit electrical signals over distances.
- They are surrounded by a material called miley: This is incorrect. The correct term is myelin, which is a fatty substance that insulates axons and enhances the speed of signal transmission.
- Axons are part of the cell that electrical signals travel along: This statement is true. Axons are elongated structures that allow electrical impulses to travel from the neuron cell body to other neurons or muscles.
- Axons are branches of a nerve cell: This statement is false. Axons are distinct from dendrites, which are the branches that receive signals. Axons are singular projections.
- Axons are a sheath made of a material called myelin: This statement is somewhat misleading. While some axons are covered with a myelin sheath that increases conductivity, axons themselves are not sheaths but rather the long projection of the neuron.
Based on the evaluations, the two true statements regarding axons are:
- Nerve cells have a long axon.
- Axons are part of the cell that electrical signals travel along.
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