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Chapter 7: Problem 18

Which cell type is more abundant in the nervous system - glial cells or neurons?

Short Answer

Expert verified
Glial cells are more abundant than neurons in the nervous system.

Step by step solution

01

Understand the Role and Abundance of Neurons

Neurons are the fundamental units of the brain and nervous system responsible for receiving sensory input, sending motor commands to muscles, and transforming/relaying electrical signals throughout the body. While neurons are critical, they are not the most abundant cells in the nervous system.
02

Understand the Role and Abundance of Glial Cells

Glial cells, or neuroglia, support and protect neurons in the nervous system. They are involved in various functions such as nutrient supply to neurons, insulating neurons, and maintaining homeostasis. In the human nervous system, glial cells are more numerous than neurons and actually exceed their numbers by a significant amount.
03

Draw the Conclusion About Cell Abundance

Given that glial cells perform crucial support roles and are present in greater numbers, it is clear that glial cells are more abundant than neurons in the nervous system.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Neurons
Neurons are the essential components of the nervous system. They are incredibly specialized cells responsible for receiving and transmitting information throughout the body. Neurons work by processing electrochemical signals, which help in coordinating everything from reflexes to complex thoughts.

Every neuron has three parts: the cell body, dendrites, and axon. The cell body is the neuron's core and houses the nucleus. Dendrites receive signals from other neurons, while the axon transmits signals to muscles or other neurons.

Despite their vital functions, neurons do not outnumber other cell types in the nervous system.
Glial Cells
Glial cells, also known as neuroglia, are supportive and protective cells in the nervous system. They do not transmit signals like neurons but provide the necessary environment for neurons to function effectively.

Glial cells have several roles:
  • Supplying nutrients and oxygen to neurons,
  • Removing cellular waste,
  • Insulating neurons with myelin,
  • Maintaining homeostasis within the neural environment.

There are different types of glial cells, including astrocytes, oligodendrocytes, and microglia. Each type plays a specific role, but all work together to ensure neurons can carry out their functions efficiently.
Cell Abundance in Nervous System
In the human nervous system, understanding cell abundance is crucial to comprehend its overall functioning. Surprisingly, glial cells outnumber neurons. This more significant number is essential for maintaining the supportive environment necessary for neurons to operate.

While neurons are integral to processing and relaying information, they require considerable support. This is why the roles of glial cells are as critical as those of neurons, ensuring both stability and effectiveness in nervous system operations.

Thus, even though neurons are the star performers, glial cells are the unsung heroes, ensuring the whole system runs smoothly.

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Most popular questions from this chapter

Explain the ionic basis of an action potential.

Neurotransmitters are released most commonly from the a) Cell body. b) Dendrites. c) Axon terminals. d) Axon hillock.

Voltage-gated calcium channels are located in which region(s) of a neuron?

When sodium inactivation gates are closed, a second action potential is impossible. (true/false)

Muscle cells, like neurons, are excitable cells in that they can produce action potentials. The resting membrane potential in muscle is approximately \(-90 \mathrm{mV}\). Assuming that only sodium and potassium ions establish the membrane potential, explain how muscle cells can have a more polarized potential than neurons.
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