Zusammenfassung der Ressource
Module 7.2 Nervous system
- The nervous system is a communication network that
has controls over all the other systems in your body.
- Nervous system is a communication network that has
controls on the other body systems.
- Two parts of nervous system
- Central Nervous system (CNS)
- Make up your brain and
spinal cord.
- CNS collect info from around the body, handles the
info, then sends out messages after instructs the body
on how to respond.
- Peripheral Nervous system (PNS)
- Make up the nerves that carry messages
to and from the CNS
- Neurons
- Specialised cells that transmit electrical messages from
one part of the body to another at very high speed.
- Nerve impulses
- Electrical messages
- Travel in only one direction
- Neurotransmitter is a chemical message
released at the end of an axon
- Synapse is the space between two neurons
- Cell body
- Nucleus is the control
centre of the cell
- Dendrites are branches from the cell body
that receive menages from other neutrons.
- Axon is the nerve fiber that sends nerve impulses
away from the cell.
- Types of neurons
- Motor neurons
- Carry messages from the CNS to effectors
- Connector neurons
- Transmit messages between neutrons in the CNS.
- Sensory neurons
- Specialised receptors which carry messages to the brain
and spinal cord from cells in the same organs
- Myelin sheath is the insulating layer
that covers a neuron.
- Brain
- Contains 100 billion neurons
- Controls and regulates body
functions.
- MRI (Magnetic Resonance Imaging)
- Strong magnetic fields that are used to determine different types of body tissue.