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Nervous system
- Motor neurons
- Have a short dendrite and long axon
- transmit messages from the central nervous system to the muscles and or glands.
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- Have a short dendrite and long axon
- Neuron
- The neuron is the functional unit of the nervous system.
- Humans have about 100 billion neurons in their brain
- All neurons have three
parts
- Dendrites
- Receive information from another cell and transmit the message to the cell body
- Receive information from another cell and transmit the message to the cell body
- Cell body
- The cell body contains the nucleus, mitochondria and other organelles that a eukaryotic cell contains.
- The cell body contains the nucleus, mitochondria and other organelles that a eukaryotic cell contains.
- Axon
- The axon transfers messages away from the cell body.
- The axon transfers messages away from the cell body.
- Dendrites
- The neuron is the functional unit of the nervous system.
- Sensory neurons
- Have a long dendrite and short axon
- Carry messages from sensory receptors to the central nervous system
- collecting information from sensory receptors that monitor the body’s internal and external conditions.
- These signals are then apssed on to the central nervous system for further processing by other neurons and nerves.
- These signals are then apssed on to the central nervous system for further processing by other neurons and nerves.
- Have a long dendrite and short axon
- Interneurons
- Are only found in the central nervous system
- They connect neuron to neuron
- Interneurons intergrate which is the processing of the many sensory signals that are passed into the Central Nervous System at any given time.
- These signals are evaluated, compared, used for decision making, diclined or transferred to the memory if needed.
- These signals are evaluated, compared, used for decision making, diclined or transferred to the memory if needed.
- Are only found in the central nervous system
- 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
- where information is processed and responses are given as a reacion
- The brain
- The brain controls the consciousness, memory, voluntary actions, and also lower body functions like the maintenance of respiration, heart rate, blood pressure and digestion
- The brain controls the consciousness, memory, voluntary actions, and also lower body functions like the maintenance of respiration, heart rate, blood pressure and digestion
- Spinal cord
- A thin mass of bundled neurons make up the spinal cord.
- These neurons carry information throughout the spine
- which begins at the medulla oblongata of the brain and continues to the lumbar region of the spine.
- which begins at the medulla oblongata of the brain and continues to the lumbar region of the spine.
- These neurons carry information throughout the spine
- A thin mass of bundled neurons make up the spinal cord.
- where information is processed and responses are given as a reacion
- Synapse
- 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
- 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
- A reflex is a fast, involuntary response to stimuli.
- 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.
- 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
- 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
- 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.
- A reflex is a fast, involuntary response to stimuli.
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