3rd Quarterly Exam
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What are the 3 major components of Nervous System
Neurons Brain Spinal Cord
A regulatory system that uses electrical impulses as signals to control the actions of cells or organs
Nervous System
Basic unit of Nervous System
Neurons
Other term for Neurons
Nerve Cells
Carry information from one body part to another
Neurons
What are the several parts of Neurons
Cell Body Dendrites Axon Axon Terminal Myelin Sheats
How many neurons do the human brain have
100 billion
Contains the nucleus and other cell organelles
Cell body
Extension of neurons that receive information from neighbouring neurons
Dendrites
Sends information to the other neurons, body tissues, and organs
Axon
The ends of axons that transmit messages to other cells via the use of neurotransmitters at synapses
Axon terminal
The junction between two neurons that allows a signal to pass between them
Synapse
The chemical signals released by the axon terminal
Neurotransmitters
An insulating layer, or sheath that forms around the nerves, including those in the brain and spinal cord
Myelin Sheats
What are the 3 types of Neurons
Sensory neurons Motor neurons Interneurons
Carry information from the sense organs to the brain and spinal cord
Sensory Neurons
Transmit messages from the brain to the muscles to generate movement
Motor Neurons
Responsible for processing the sensory information carried by sensory neurons and giving a response through motor neurons
Interneurons
The way nerve cells or neurons communicate with one another
Nerve impulse
Recieve electric signals from the nerve impulse
Dendrites
What travels along the axon in the nerve impulse
Electrical signals
Axon terminals release the electrical signals as
Chemical Signals or Neurotransmitters
Where does the neurotransmitters releases
Synapse
2 types of nervous systems
Central Nervous System (CNS) Peripheral Nervous System (PNS)