Nerve tissue Flashcards
Nerve
They are made up of cells called neurones
Neuron
They can carry messages in the form of electric signals from one part of the body to another.
Schwann cells
The axon surrounded by Schwann cells which insulate it and helps signal travel
Dendrites
They are numerous dendrites to connect to other neurons.
Axon
They are very long to transmit signals large distances.
Soma (cell body)
Contains nucleus, ribosomes, rough ER and many mitochondria
Myelin sheath
They are the membranes of the Schwann cells form a myelin sheath around the axon as they are rich in a fat called a myelin. Also helps the impulse travels faster.
Nodes of Ranvier
They are the gaps in made in the myelin sheath, they allow the electrical impulse to pick up speed.
Sensory neurone
Connects sensory receptors to the central nervous system.
Replay neurone
Found in the nervous system
Motor neurone
Communicates from central nervous system to receptors.
Depolarisation
It is the loss of potential difference across the membrane.
Action potential
It is the electrical potential which results from the process of ions moving across the neuron cell membrane.
Resting potential
When a neuron is not transmitting an action potential and it at rest.
Repolarisation
The inside of the cell becomes more negative again.
