Nerve Tissue Flashcards
(16 cards)
What are the cells called that make up nerves?
Neurones
Neurones carry messages in the form of electric signals from one part of the body to another.
What is the function of neurones?
Carry messages in the form of electric signals
These messages are also known as nerve impulses.
What are the two main divisions of the nervous system?
Central nervous system (CNS) and peripheral nervous system
The CNS is made up of the brain and spinal cord.
What does the cell body of a neurone contain?
Nucleus
The cell body is where all materials needed by the cell are made.
What is the role of the myelin sheath?
Electrically insulating layer
It helps to speed up the transmission of electrical impulses.
What are dendrites responsible for?
Receiving chemical signals from the axon terminal of other neurons
Dendrites play a key role in neuron communication.
What are Schwann cells responsible for?
Producing myelin sheath
Schwann cells are essential for the insulation of nerve fibers.
What are nodes of Ranvier?
Gaps in the myelin sheath
They allow the electrical impulse to pick up speed.
What is the difference between myelinated and non-myelinated nerve cells?
Myelinated have a myelin sheath; non-myelinated do not
Myelinated cells transmit impulses very fast, while non-myelinated transmit impulses slower.
What color do non-myelinated nerve cells appear?
Grey
Myelinated nerve cells appear white.
What type of neurone connects sensory receptors to the central nervous system?
Sensory neurone
Sensory neurones are crucial for transmitting sensory information.
What type of neurone communicates from the central nervous system to effectors?
Motor neurone
Motor neurones play a key role in triggering responses.
What role does a relay neurone serve?
Found in the central nervous system
Relay neurones connect sensory and motor neurones.
Fill in the blank: Multiple sclerosis is a _______ de-myelinating disease.
progressive
‘Progressive’ means increases over time.
True or False: Myelinated nerve cells have nodes of Ranvier.
True
Nodes of Ranvier are present in myelinated nerve cells to facilitate faster impulse transmission.
What happens to the transmission of nervous impulses in Multiple sclerosis?
It is affected due to the removal of myelin
This demyelination leads to slower transmission of nerve impulses.
