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Which of the following is true of normal human nerve cells?

Rationale

Normal human nerve cells detect stimuli such as light and heat.

Nerve cells, or neurons, are specialized cells that play a crucial role in the nervous system by receiving and transmitting signals. They are responsible for detecting various stimuli, including sensory information from the environment, which is essential for processing and responding to external changes.

A (They detect stimuli such as light and heat.) CORRECT

This statement accurately describes the function of sensory neurons, which are a type of nerve cell that responds to environmental stimuli such as light and heat. These neurons convert physical stimuli into electrical signals, allowing the nervous system to interpret and react to sensory information.

B (They transmit genetic information to the next generation.) YOUR ANSWER

This choice is incorrect as nerve cells do not play a role in the transmission of genetic information. Genetic material is passed from parents to offspring through reproductive cells (gametes), not through somatic cells like neurons, which are responsible for transmitting signals within the nervous system.

C (They are interchangeable with one another in function.) YOUR ANSWER

Nerve cells are not interchangeable; each type of neuron has a specific function and role within the nervous system. For example, sensory neurons, motor neurons, and interneurons all have distinct functions in processing and transmitting information, making them specialized rather than interchangeable.

D (They generate force for locomotion.) YOUR ANSWER

While nerve cells control muscle contractions that enable locomotion, they do not generate force themselves. The force for movement is produced by muscle fibers, which are stimulated by motor neurons. Thus, this statement misrepresents the role of nerve cells in relation to movement.

Conclusion

Nerve cells are fundamental components of the nervous system, primarily responsible for detecting stimuli and transmitting signals. Among the provided options, the ability of nerve cells to detect stimuli such as light and heat is their defining characteristic. Other choices incorrectly attribute functions to neurons that belong to different biological systems or misrepresent their specialized roles within the nervous system.

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