Module 4-the Nervous System And The Endocrine System Flashcards
What is a dendrite?
The branching extensions of a neuron that receive information and conduct impulses toward the cell body
What are neurons?
The building blocks of the nervous system
What is the Soma
The cell body of a neuron, which contains the Nucleus and other parts that keep the cell healthy
Axon terminal button?
The end point of a neuron where neurotransmitters are stored
Axon?
The extension of a neuron through which neural impulses are sent, passes messages away from the cell body to other muscles, neurons or glands
Myelin sheath?
Protects the axon and influences the speed of the neural impulse
What tasks do neurons perform?
- Retrieve information 2. Carry the information 3. Pass the information
When a neuron fires, what is the neural impulse called?
Action potential
What is an action potential?
A brief electrical charge that travels down the dendrites of a neuron
Each action potential is followed by a brief
Recharging phase- refractory period
When the neuronis recharged, at rest, and he will generating another action potential,
A resting potential exists
What is the all or none principal
This means that a neuron always fires of the same intensity
How do you messages travel from under onto the next
And everyplace were an axon terminal one neuron and the dendrite of an accident near on wheat, there’s a tiny fluid filled got caught us in at that action potential potential cannot jump. In this gap, chemical messengers not as neurotransmitters travel across the synapse to carry the information from under onto the next. The neurotransmitters can come to rest only receptor sites to find that their shape, just as a key can open locks on the configuration
What is the central nervous system
Includes the brain and the spinal cord. The brain is where most of the information processing takes place, and the spinal cord is the main pathway information follows as it enters and leaves the brain.
What is the peripheral nervous system
Contains all sensory nerves and motor nerves that connect the brain and spinal cord to the rest of the body. The peripheral nervous system divides into two subsystems
What are the two subsystems of the peripheral nervous system
The somatic nervous system and the autonomic nervous system
What is the somatic nervous system
The division of the peripheral nervous system that controls the body skeletal muscles. Contains the motor nerves needed for the voluntary muscles.
What is the autonomic nervous system
The division of the peripheral nervous system that controls the glands and muscles of the internal organs it subdivisions of the sympathetic division and the parasympathetic division. Monitors the autonomic functions. Controls breathing, blood pressure and digestive processes.
What is the sympathetic nervous system
The part of the autonomic nervous system that arouses the body to deal with perceived threats
What is the parasympathetic nervous system
Calms the body, bring the body back down to a relaxed state
The bodies other system for communicating information is called
Endocrine system
This system is slower to awaken and storage shed down in the nervous system. It consists of a set of blank that produce what
Glands that produce hormones
What are hormones
Her mom’s a chemical messengers that circulate throughout the body in the blood
Hormones and what are similar in function and why
Hormones and neurotransmitters are similar in function. Both carry messages and both communicate by locking into receptor sites.
