Nervous system

Nervous system

Motor neurons
1. Have a short dendrite and long axon
2. transmit messages from the central nervous system to the muscles and or glands.
3. Enter text here
Neuron
1. The neuron is the functional unit of the nervous system.
2. Humans have about 100 billion neurons in their brain
3. All neurons have three parts
  1. Dendrites
    1. Receive information from another cell and transmit the message to the cell body
  2. Cell body
    1. The cell body contains the nucleus, mitochondria and other organelles that a eukaryotic cell contains.
  3. Axon
    1. The axon transfers messages away from the cell body.
Sensory neurons
1. Have a long dendrite and short axon
2. Carry messages from sensory receptors to the central nervous system
3. collecting information from sensory receptors that monitor the body’s internal and external conditions.
  1. These signals are then apssed on to the central nervous system for further processing by other neurons and nerves.
Interneurons
1. Are only found in the central nervous system
2. They connect neuron to neuron
3. Interneurons intergrate which is the processing of the many sensory signals that are passed into the Central Nervous System at any given time.
  1. These signals are evaluated, compared, used for decision making, diclined or transferred to the memory if needed.
http://www.emc.maricopa.edu/faculty/farabee/biobk/biobooknerv.html
chttp://www.innerbody.com/image/nervov.html
The brain and spinal cord together form the central nervous system
1. where information is processed and responses are given as a reacion
2. The brain
  1. The brain controls the consciousness, memory, voluntary actions, and also lower body functions like the maintenance of respiration, heart rate, blood pressure and digestion
3. Spinal cord
  1. A thin mass of bundled neurons make up the spinal cord.
    1. These neurons carry information throughout the spine
      1. which begins at the medulla oblongata of the brain and continues to the lumbar region of the spine.
Synapse
1. A synapse is a the connection between a neuron an another cell. A synapse forms between two neurons or between a neuron and an effector cell
Reflexes
1. A reflex is a fast, involuntary response to stimuli.
  1. Reflexes give the body a chance to respond to stimuli very quickly by sending responses to effectors before the nerve signals reach the conscious parts of the brain.
    1. An example of explanation of this is when people will often pull their hands away from a hot object before they realise they are in pain

Nächster

Beschreibung

Zusammenfassung der Ressource

ähnlicher Inhalt

	Erstellt von shassani vor mehr als 11 Jahre