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Chapter 4: Problem 5

The production of new neurons from immature stem cells is a process known as a. Neuromimetics c. Neurogenesis b. Neural spread d. Ontogenesis

Short Answer

Expert verified
The process is c. Neurogenesis.

Step by step solution

01

Understand the Question

We need to identify the correct term for the process of forming new neurons from stem cells.
02

Define Terms

Neuromimetics refers to the imitation of neural functions or structures, usually in technology or drugs. Neural spread typically relates to the dispersion of information or signals through neurons. Ontogenesis is the development of an individual organism or anatomical or behavioral feature from the earliest stage to maturity. Neurogenesis is the creation of new neurons from stem cells.
03

Identify the Correct Answer

Among the given options, 'neurogenesis' specifically refers to the production of new neurons from immature stem cells. The other options describe different biological processes or are unrelated.

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Key Concepts

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

Stem Cells
Stem cells are unique cells with the remarkable ability to develop into various cell types in the body. Their defining feature is their ability to self-renew, meaning they can divide and produce more stem cells, maintaining their numbers. Moreover, they can differentiate, transforming into specialized cells with specific functions depending on the needs of the organism.
There are two primary types of stem cells:
  • Embryonic Stem Cells: These stem cells are obtained from the early stages of embryos and have the potential to become any cell type in the body. This capability makes them pluripotent, allowing for great versatility in research and medical applications.
  • Adult Stem Cells: Found in various tissues like the brain, bone marrow, and skin, these stem cells are more limited. They are usually multipotent, meaning they can develop into a limited range of cell types related to their tissue of origin. For example, neural stem cells can differentiate into neurons or glial cells in the brain.
Understanding stem cells is crucial for comprehending how neurogenesis occurs, as these cells form the basis for new neuron development.
Neuron Development
Neuron development, also known as neurogenesis, is the fascinating process by which new neurons are generated from stem cells. This process is most active during prenatal development, but it also continues throughout life in certain brain regions like the hippocampus, a region associated with memory and learning.
The process of neuron development involves several critical stages:
  • Proliferation: Stem cells divide to produce new cells, increasing the number of cells available for differentiation.
  • Differentiation: The newly formed cells begin to take on characteristics of neurons, including the development of axons and dendrites needed for signal transmission.
  • Migration: Neurons move from their origin to their final position within the brain, ensuring they are correctly situated to form neural networks.
  • Synaptogenesis: Once neurons reach their destinations, they establish connections with other neurons, forming synapses, which are essential for communication within the brain.
Neuron development is a finely tuned process vital for maintaining brain function and for the brain's ability to adapt and form new memories.
Biological Processes
Biological processes encompass all the functions and activities that occur within living organisms to sustain life. These processes can be as varied as cell division, enzyme activity, or oxygen transport.
Within the context of neurogenesis, several biological processes are crucial:
  • Cell Cycle Regulation: Controls the timing and rate of cell division to ensure there are enough stem cells generating new neurons.
  • Gene Expression: Determined which genes are active or inactive during different stages of neuron development, influencing cell behavior and specialization.
  • Signal Transduction: Involves pathways that govern how cells respond to external signals, guiding processes like differentiation and synaptogenesis.
By understanding these processes, scientists can gain insights into how the brain develops, how it is maintained, and how neurogenesis continues to support cognitive function throughout life.

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Most popular questions from this chapter

How does transcranial magnetic stimulation (TMS) help researchers to understand functioning in the brain? a. TMS can temporarily inactivate neural circuits, allowing researchers to observe the effects on behavior. b. TMS measures changes in blood glucose levels in the brain, which are correlated with different types of information-processing tasks. c. TMS provides a record of brain-wave activity, which allows researchers to predict where future patterns of thoughts are likely to occur. d. TMS detects differences in blood oxygen absorption in the brain, providing a kind of "map" of brain functions that researchers can inspect.

The brain stem structure involved in sleeping, waking, and dreaming is the a. Pons b. Medulla oblongata c. Reticular activating system d. Hypothalamic projection

Why would surgeons sever the corpus callosum in the human brain to create a split-brain patient? a. For the greater benefit of science b. As a means of studying how the corpus callosum works c. In order to relieve the consequences of debilitating epileptic seizures d. To gain access to brain structures such as the thalamus, hypothalamus, and hippocampus

The two subdivisions of the autonomic nervous system are the ____ and the ____. a. Central nervous system / peripheral nervous system b. Sympathetic nervous system / parasympathetic nervous system c. Somatic nervous system / sympathetic nervous system d. Parasympathetic nervous system / peripheral nervous system

Why is it incorrect to think of people as being "left-brained" or "right- brained"? a. There are no identifiable functions associated with one hemisphere or the other; talk of being "left-brained" is a stereotype. b. Information received in one hemisphere travels to the other hemisphere via the corpus callosum, so the "whole brain" is always engaged. c. The division between "lower" and "upper" brain structures is more important, such that some people are "low-brained" and others are "high- brained." d. "Left-brain" tasks are complex, whereas "right-brain" tasks deal with basic survival; therefore, we are all right-brained as long as we're alive and breathing.
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