Neurons (Leaving Cert Biology): Flashcards
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15 cards from this deck
Definition of a neuron
Definition of a neuron
A nerve cell
How many types of neurons are there?
How many types of neurons are there?
Three
Where sensory neurons carry impulses
Where sensory neurons carry impulses
From sense organs to the CNS
Where motor neurons carry impulses
Where motor neurons carry impulses
Away from CNS to muscles and glands (effectors)
Role of interneurons
Role of interneurons
Carry info between sensory and motor neurons
Definition of effectors
Definition of effectors
Organs or tissues that carry out CNS action
Location of sensory neuron cell body
Location of sensory neuron cell body
Outside the CNS
Location of motor neuron cell body
Location of motor neuron cell body
Inside the CNS
Function of dendrites
Function of dendrites
Receive impulses from neurons, transmit towards cell body
Function of axon
Function of axon
Carries electrical impulses away from cell body
What is the myelin sheath made of?
What is the myelin sheath made of?
Lipids
Function of myelin sheath
Function of myelin sheath
Protects axon/dendrites and speeds up impulses
What do Schwann cells form?
What do Schwann cells form?
The myelin sheath
Function of nodes of Ranvier
Function of nodes of Ranvier
Speed up impulses by allowing them to jump node to node
Contents of synaptic vesicles
Contents of synaptic vesicles
Neurotransmitter chemicals