Parts Of The Nervous System Flashcards
(23 cards)
How much of the nasal cavity is used to filter the air you smell before it goes into your lungs?
95%
What is an olfactory epithelium?
It is a little patch of skin that’s key to everything you smell.
What are olfactory receptor cells?
Special neurons that sense smells
How can you tell how well a species smells?
How big their olfactory epithelium is
How often do olfactory epithelium get replaced?
Every 4 to 8 weeks
What is the body system that senses the environment and controls actions?
The nervous system
What is the two main divisions the nervous system is made up of?
The central nervous system. The peripheral nervous system.
What nervous system consists of the brain and spinal cord?
The central nervous system.
Hint: Central = centre. Centre of the body = brain and spinal cord
What does the peripheral nervous system consists of?
Bundles of nerves that sends messages between the central nervous system and the muscles and glands.
Explain how your body deals with a cockroach running over your foot using the sensory input, motor input and Interneurons theories
Sensory Input is feeling a cockroach over your foot, sensing it with sensory receptors. 
Integration is how the nervous system processes and decides what should be done. Are you going to freak out about the cockroach or let it walk over your foot.
Mortory input is the response that occurs when your nervous system activates parts of your body. For example your foot kicking off the cockroach. 
What nervous system uses sensory input, integration and motory input?
The peripheral nervous system
What is the difference between the somatic nervous system and the autonomic nervous system?
Somatic = Voluntary Autonomic = Involuntary
Explain Somatic Nervous System
Uses your skeletal muscle movement
Explain Autonomic Nervous System
It keeps your heart beating, your lungs breathing. It’s AUTOmatic
What is a neuron?
They respond to stimuli and transmit signals.
Hint: Translate = makes sense of a different language
Transmit = makes sense of a signals from PNS.
What do dendrites do?
They pick up signals from other neurons (out of their axon endings)
Easy: branches that receives messages
What is the purpose of the axon in the neuron?
It carries the impulse to the axon terminal
What is the myelin sheath
A fatty layer that insulates the axon
What are the nodes of Ranvier
The gaps between the Myelin sheaths
Describe two differences between the central nervous system and the peripheral nervous system.
The central nervous system receives sensory information. The peripheral nervous system sends the sensory information.
The central nervous system includes the brain and spinal cord (the centre of it) whereas, the peripheral nervous system includes the cell bundles.
Sensory input
Interneurons
Motory
=PNS
What is the purpose of the Myelin Sheath?
It allows the impulses that the axon is carrying to the terminal to transmit quickly and efficiently.
What does the nodes of ranvier do?
Make the nerve impulses easier for the myelin sheath to carry impulses rapidly.
What is the purpose of the nucleus?
It controls and regulates the activities of the cell.
