Art-labeling Activity: Figure 11.5 (1 of 2) Label the parts of a motor neuron

Art-labeling Activity: Figure 11.5 (1 of 2) Label the parts of a motor neuron. Part A Drag the appropriate labels to their respective targets. Reset Help Cell body Myelin sheath gap Schwann cell Axon terminals Initial segment of axon Dendrites Axon hillock H4 Chromatophilic substance Nucleus Axon Submit Request Answer

The correct answer and explanation is:

Here is the correct labeling for the parts of a motor neuron based on the provided activity:

1. Cell body: The central part of the neuron containing the nucleus and most of the organelles.
2. Nucleus: Located within the cell body, it contains the genetic material (DNA).
3. Dendrites: Branch-like structures extending from the cell body that receive signals from other neurons.
4. Chromatophilic substance (Nissl bodies): Rough endoplasmic reticulum in the neuron, involved in protein synthesis.
5. Axon hillock: The cone-shaped region of the cell body where the axon originates. It is critical for generating action potentials.
6. Initial segment of axon: The first part of the axon, where action potentials typically begin.
7. Axon: A long, slender projection of the neuron that transmits signals away from the cell body to other neurons or muscles.
8. Myelin sheath gap (Node of Ranvier): Gaps in the myelin sheath along the axon that facilitate rapid signal transmission.
9. Schwann cell: Glial cells that produce the myelin sheath in the peripheral nervous system.
10. Axon terminals: The distal ends of the axon where neurotransmitters are released to communicate with target cells.

Explanation:

A motor neuron is a specialized cell that transmits nerve impulses from the central nervous system to muscles or glands. Each part of the neuron has a unique role:

• Dendrites receive incoming signals, allowing the neuron to gather input from other cells.
• The cell body integrates these signals and houses the nucleus, which directs cellular activities.
• The axon hillock determines whether the input signals are strong enough to trigger an action potential.
• The axon carries electrical impulses (action potentials) over long distances, with the myelin sheath (produced by Schwann cells) insulating the axon to speed up signal transmission.
• The Nodes of Ranvier allow the signal to “jump” along the axon in a process called saltatory conduction, significantly increasing speed.
• Finally, the axon terminals release neurotransmitters, which convey the signal to the next cell or muscle.

This coordinated structure ensures the precise transmission of signals, enabling motor functions essential for movement and response to stimuli.