Human Body- Unit 6

Question Answer
What is the Nervous system? -a collection of organs that work together to gather and interpret information about the body's internal and external environment, and respond to that information
Name the 2 subdivisions of the Nervous system. 1)The Peripheral Nervous System (PNS)
2)The Central Nervous System (CNS)
Explain the Peripheral Nervous System (PNS). -it includes nerves (communication paths that connect the entire body to the brain and spinal cord (CNS))
Explain the Central Nervous System (CNS). -it includes the brain and spinal cord
-it processes all incoming and outgoing messages
Name the structures of the Nervous System. 1)Neuron
2)Sensory Neuron
3)Motor Neuron
5)Spinal Cord
What is a Neuron? -a type of cell that transfers electrical messages throughout the body
What is a Dendrite? -it receives messages
-it is many short branched extensions
What is an Axon? -it sends messages
-it is long
What is an Impulse? -an electrical message that travels through the neuron
What is a Synapse? -a space between one neuron and another
What is a Sensory Neuron? -a special neuron that gathers information about what is happening in and around your body
-It sends this information to the brain
What is a Motor Neuron? -a special neuron that sends messages from the brain and spinal cord to the body
What is a Receptor? -a specialized dendrite that receives sensory messages.
-the first dendrites in the path to your brain
Explain what receptors in your stomach do. -they tell your brain when you are hungry or full
What is the Nervous System's largest organ? -the brain
What are the 3 parts of the brain? 1)cerebrum
What is the largest part of the brain? -the cerebrum
Name the 2 parts or hemispheres of the cerebrum. 1)the left hemisphere
2)the right hemisphere
What does the left hemisphere do? -it controls the right side of the body
What activities does the left hemisphere control? -it controls speaking, reading, writing, problem solving
What does the right hemisphere do? -it controls the left side of the body
What activities does the right hemisphere control? –it controls imagination, appreciation, creativity
What is the function of the cerebellum? -it receives sensory impulses and controls balance
What does the medulla do? -it connects the brain to the spinal cord
-it is involved in breathing, blood pressure and heart rate
What is the spinal cord responsible for? -it sends information to and from the brain
Describe the spinal cord. -it is as big around as your thumb
-it is surrounded by protective bones called vertebrae
What is a reflex? -ii is involuntary action that protects you
-it is a shortcut from the spinal cord to your muscles
-by the time your brain gets the signal, you are already out of danger
Name some diseases of the Nervous System. 1)Alzheimer's
2)Multiple Sclerosis

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