Nervous system Moodle questions

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Questions and Answers

What are the two divisions of the nervous system and their components?

The central nervous system- brain and spinal cord. The peripheral nervous system- all other nerves

What are the cells of the nervous system?

Neurones, Schwann cells, neuroglial/glial cells

What are the two properties of neurones?

Irritability and conductivity

What are the key features of a neurone?

Axon, Schwann cells, cell body, nodes of ranvier, dendrites, synaptic end bulb Signup and view all the answers

What do Schwann cells do?

Act as an insulator and layer form the myelin sheath Signup and view all the answers

What are the nodes of ranvier and what do they do?

Gaps in the myelin sheath and they assist in rapid transmission of action potentials in myelinated neurones Signup and view all the answers

What is the function of dendrites?

Form synapses with other dentrites. Provide a large surface area to receive information to pass to the cell body Signup and view all the answers

Name the neuroglial cells

Microglia astrocytes oligodendrocrytes Signup and view all the answers

What is the main function of astrocytes?

Main supporting tissue of the CNS and forms part of the blood brain barrier Signup and view all the answers

What do sign synaptic end bulbs contain?

Synaptic vesicles containing neurotransmitters Signup and view all the answers

Give 3 characteristics of nerve impulses?

Travels in one direction, can only send one message at one speed, frequency of impulses can vary Signup and view all the answers

What is the characteristic of the ion channels in the axon?

Voltage gated Signup and view all the answers

How to nerve impulse transmit to the next nerve?

Neurotransmitters stored in vesicles in synaptic end knob, neurotransmitter released into synapse, nearby transmitter received by neighbouring dendrite Signup and view all the answers

Where are neurotransmitters made?

In the cell body of neurones Signup and view all the answers

Name four neurotransmitters

Adrenaline, noradrenaline, histamine, dopamine Signup and view all the answers

Give one example of the importance of nerve impulses in dentistry

Local anaesthesia Signup and view all the answers

Flashcards

Central Nervous System

Brain and spinal cord.

Peripheral Nervous System

All nerves outside the brain and spinal cord.