any change or signal in the environment that can make an organism react in some way
what the body does in reaction to a stimulus
a cell that carries information through the nervous system; also called nerve cells
the message carried by a neuron
a threadlike extension of a neuron that carries nerve impulses toward the cell body
an extension of a neuron that carries nerve impulses away from the cell body
a bundle of nerve fibers; can be compared to a bundle of spaghetti in a cellophane wrapper
a neuron that picks up stimuli from the internal or external environment and converts each stimulus into a nerve impulse
a neuron that carries nerve impulses from one neuron to another
a neuron that sends an impulse to a muscle or gland, causing the muscle or gland to react
the junction where one neuron can transfer an impulse to the next structure
receive information; directs how your body responds to information; helps maintain homeostasis
What are the three functions of the nervous system?
Your nervous system receives information from both __________ and ____________ your body.
Swatting a fly is an example of a _______________ response.
Controlling your heart rate is an example of a _______________ response.
prompts you to eat when your need energy.
An example of your body maintaining homeostasis is when your body _________________________________.
dendrites to the neuron cell body, then to the axon, then to the tips of the axon
What is the path that impulses take within an neuron?
Axons have more than one tip
Why can nerve impulses go to more than one cell?
Axons and dendrites are also called ________________.
sensory, inter-, and motor
What are the three kinds of neurons?
sensory (hear it), then interneuron (realize what the sound means), then motor neuron (muscles carry out your response of _____________)
What is the path that nerve impulses would take to answer the phone?
Nerve impulses __________________ at the dendrite.
120 meters per second
How fast do nerve impulses travel?
another neuron; muscle; cell in another organ
When a nerve impulse travels through a neuron, it passes to ____________________ or a ______________________ or ______________________.
For an impulse to be carried along a synapse, it must cross a _________________ between the axon of the first neuron and the next structure; ____________________ carry the impulse across