Intro to Nervous System Flashcards
List the general steps by which the nervous system generates an appropriate response to information from the internal and external environments.
- Sensory receptors extracts info from internal and external environments.
- Sensory receptors sends signals to the brain.
- The brain processes the information to determine response.
- The brain sends signals to muscles, organs or glands to bring about the response.
What are neurons?
Cells of the nerves that transmit the nerve impulses sent by the nervous system
Compare and contrast the central and peripheral nervous systems.
Both:
- A main division in the nervous system
Central:
- Brain and spinal cord
Peripheral:
- Ganglia and nerves
Which major division of the peripheral nervous system allows you to walk to class? Which major division of the peripheral nervous system controls your heart rate?
The somatic division allows you to walk
The automatic division controls your heart rate
Identify the functions of the three divisions of the autonomic nervous system.
Sympathetic: Fight or flight response in emergencies
Parasympathetic: Routine functions of the body
Enteric: Controls digestive system
What is an axon and what is its function?
The axon is a part of the neuron and carries the nerve impulses to other cells
True or False. A nerve impulse always causes the target cell to perform an action.
False
The spinal cord is not considered part of the peripheral nervous system.
True
Define nerve impulses.
The signals sent by the nervous system
Explain why signals in the nervous system are generally more targeted and specific than signals in the endocrine system.
Because certain signals require action only from specific parts of the body
Explain generally how the brain and spinal cord can interact with and control the rest of the body.
The brain and spinal cord receive information from the nerves in the peripheral nervous system
___________ actions are performed without the person thinking about them.
Automatic
The fight-or-flight response is controlled by the:
A. autonomic nervous system
B. somatic nervous system
C. central nervous system
D. parasympathetic nervous system
A. autonomic nervous system
How are nerves and neurons related?
Nerves are bundles of axons from neurons
What type of information from the outside environment do you think is detected by sensory receptors in your ears?
Sound waves
