The nervous system

• diagram of ns


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• define the Nervous system

  -network of nerves cells that transmit messages between different parts of the body, allowing communication to take place
• nervous system is divided into what

  -the central nervous system and the peripheral nervous system.
• function of the cns

  -This consists of the brain and the spinal cord.​​

  -These transfer messages to and from the environment.
• function of the PNS

  -The PNS sends and receives information from and to the Central Nervous System.
• Brain's function

  -It is the centre of all conscious awareness ​

  -Divided into different lobes with different functions.
• Spinal cord's function

  -an extension of the brain. ​

  -Responsible for reflex actions such as pulling your hand away from a hot plate.
• function of somatic ns

  -Carries sensory info from sensory organs to CNS and relays motor commands to muscles

  -controls voluntary movements
• function of autonomic

  -Regulates involuntary bodily processes, including heart rate, respiration, etc.
• neuron diagram


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• function of a dendrite

  -receives information from other neurons to transmit electrical signals towards the cell body.
• function of a cell body

  -core of the neuron – maintain the cell and keeps the neuron functioning efficiently.
• function of an axon

  -carries the signals away from the cell body to the terminal buttons, in order to transmit the electrical signals to other neurons.
• function of myelin sheath

  -insulates axon to stop interference from other neurons and protect the axon – this transmits the signal quicker as a result
• function of axon terminal/terminal button

  -responsible for transmitting the signal on to other neurons.
• diagram of other neurons


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• outline sensory neurons

  -these carry messages from the PNS to the CNS. They have long dendrites and short axons.

  -Afferent neuron (sensory) send information towards the brain.
• outline relay neurons

  -These connect the sensory neurons to the motor neurons or other relay neurons. They have short dendrites and short axons.
• outline motor neurons

  -these connect the CNS to effectors such as muscles and glands. They have short dendrites and long axons.

  -Efferent neuron (motor) carry information away from the brain.