Nervous System Flashcards
What are the two sections that the nervous system is divided into?
CNS
PNS
What does CNS stand for?
Central nervous system
What is the central nervous system comprised of?
Brain and Spinal cord
What’s does PNS stand for
Peripheral Nervous System
What is the PNS made up of?
All the other neurons outside the CNS
What does the nervous system allow the body to do?
Allows the organism to react to the stimulus very quickly.
What are the responses like of nervous system?
Rapid and short
What are the two parts of the PNS?
- Sensory division
- Motor Division
Outline the role of the sensory division
Transmits information to the CNS
Outline the role of the motor division.
Transmits information away from the CNS
What are the roles of the somatic sensory neurons?
Transmits information to the CNS from the external environment via senses
What is the role of visceral sensory neurons?
Transmits information to the CNS from the internal environment e.g organ
What are the two systems of motor division?
Somatic Nervous System
Autonomic Nervous a System
What is the role of the somatic nervous system?
Transmits messages to skeletal muscles. This is a VOLUNTARY system
What is the role of the autonomic nervous system
It is an involuntary system
It sends messages to smooth muscles, heart muscle and glands as humans cannot control these things
What are the two sections of the autonomic nervous system
- Sympathetic
- Parasympathetic
Explain synaptic signalling
Nerve cells releases neurotransmitter molecules into synaptic celft, stimulating target cell
What are responses to the changed dectected by the nervous system like?
Rapid and short
What is a nerve cell called
A neuron
What sort of impulses do neurons transmit?
Electrical
Function:Cell body in neuron
Mass of cytoplasm with contains a nucleus, from which branches of neurons arise