Brain Study Guide
STUDY GUIDE: THE BRAIN
1. Approximately how many neurons are there in the brain? about 100 billion
2. What is a neuron? It is a nerve cell that sends and receives electrical signals over long distances within the body
2b. be able to label its parts. Parts of a neuron. A neuron has three basic parts, the cell body, the axon, and the dendrites. A thin nerve membrane surrounds the entire cell
3. How fast do neurons travel? Neurons don't travel, the impulses they transmit do. As a simple analogy, a neuron is like an electric cord: it stays still but an electric current flows through it. In the same way, a neuron stays still and electrical potentials (graded potentials and an action potential) move along its membrane fr...
4. What part of the neuron receives information? The function of the dendrites is to receive informat
5. How large are neurons? Neurons range from about 10 to 50 microns in diameter
5b Do they regenerate?
Neurons can only regenerate, or I should say re-synapse with neighboring neurons, if they are realigned with each other surgically
6. What is the relationship between a neuron and a nerve? A neuron is a nerve cell, and a nerve is a whole bunch of neurons
7. About how many connections does each neuron have? It's normal for each neuron to have 1000 connections
8. What is the space between neurons called? the synapse
9. What are neurotransmitters? A chemical substance, such as acetylcholine or dopamine, that transmits nerve impulses across a synapse.
9b? Where are they stored in the neuron within motor neuron endings
10. Neurotransmitters can be excitatory or inhibitory. Explain. Excitatory neurotransmitters decrease the negativity of postsynaptic membrane potentials; inhibitory
1. Approximately how many neurons are there in the brain? about 100 billion
2. What is a neuron? It is a nerve cell that sends and receives electrical signals over long distances within the body
2b. be able to label its parts. Parts of a neuron. A neuron has three basic parts, the cell body, the axon, and the dendrites. A thin nerve membrane surrounds the entire cell
3. How fast do neurons travel? Neurons don't travel, the impulses they transmit do. As a simple analogy, a neuron is like an electric cord: it stays still but an electric current flows through it. In the same way, a neuron stays still and electrical potentials (graded potentials and an action potential) move along its membrane fr...
4. What part of the neuron receives information? The function of the dendrites is to receive informat
5. How large are neurons? Neurons range from about 10 to 50 microns in diameter
5b Do they regenerate?
Neurons can only regenerate, or I should say re-synapse with neighboring neurons, if they are realigned with each other surgically
6. What is the relationship between a neuron and a nerve? A neuron is a nerve cell, and a nerve is a whole bunch of neurons
7. About how many connections does each neuron have? It's normal for each neuron to have 1000 connections
8. What is the space between neurons called? the synapse
9. What are neurotransmitters? A chemical substance, such as acetylcholine or dopamine, that transmits nerve impulses across a synapse.
9b? Where are they stored in the neuron within motor neuron endings
10. Neurotransmitters can be excitatory or inhibitory. Explain. Excitatory neurotransmitters decrease the negativity of postsynaptic membrane potentials; inhibitory