EasyBiologyHigh School (11–12)Tissues and Organs › Structural Organisation in AnimalsConceptualA-LevelIB
Name the part of a neuron that does each job…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Name the part of a neuron that does each job.
- It holds the nucleus and the Nissl granules.
- It brings the impulse towards the cell body.
- It carries the impulse away from the cell body.
- It is the swollen end that passes the impulse to the next cell.
- It is the gap in the myelin sheath.
Need a reminder? The key ideaShow
Neural tissue controls the responses of the body. The neuron is the unit of the nervous system. A neuron has a cell body (cyton) with the nucleus and Nissl granules, dendrites that bring impulses to the cell body, and an axon that carries impulses away. The axon ends in axon terminals. A myelinated axon has a myelin sheath with gaps called nodes of Ranvier. The impulse jumps from node to node, so a myelinated fibre conducts faster than an unmyelinated one. Neuroglia support and protect neurons and make up more than half the volume of neural tissue. The time taken by an impulse is the distance divided by the speed.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The cell body, or cyton.
Step 2. (b) The dendrites.
Step 3. (c) The axon.
Step 4. (d) The axon terminals, which end in small swellings.
Step 5. (e) The node of Ranvier.
Answer: (a) cell body; (b) dendrites; (c) axon; (d) axon terminals; (e) node of Ranvier.
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