Nervous System. Flashcards
Which of the following are parts of neurons ?
dendrite,axon and cell body
A sensory nerve takes nerve messages from sensory receptors to the __________
CNS
Central Nervous system
The _______ is responsible for thinking and personality:
Frontal Lobe.
Which activity would be difficult after sustaining damage to the cerebellum?
Walking
The chemicals involved in passing messages between your nerve cells are :
Neurotransmitters
A disease , which affects the motor neurons , will cause a problem in the transmission of nerve messages.
From the spinal cord to the muscles
In bright light , the iris of the eye
Constricts (becomes smaller )
Reflex actions are described as involuntary. Explain what this means
Involuntary means that your body does it without being told. Such as Breathing
Define the term Stimulus
Something that triggers response
Define the term receptors
an organ or cell able to respond to heat , light or an other external stimulus.
Define the term effector
a organ or cell that responses to a stimulus.
Define the term response
a reaction to something
Parts of a neuron and there function
Cell body - life support centre
Dendrites - Branching extensions at the cell body.
Axon - long single extension of a neuron , covered up with myelin sheath to speed up message through the neuron
Axon terminal - Branched endings of an axon that transmit messages to other neurons .
Synapse - to transfer electric activity from one cell to another
Neurotransmitter -chemicals that are released from vesicles.
Function of the brain
the brain along with the spinal cord complete the bodies nervous system.
Cerebellum
Portion of the brain at the back of the head , The cerebellum receives information from the sensory systems, the spinal cord, and other parts of the brain and then regulates motor movements. The cerebellum coordinates voluntary movements such as posture, balance, coordination, and speech, resulting in smooth and balanced muscular activity.
