B10 The Nervous System Flashcards
What does a sensory nueron do
Carries the electrical impulse to the central nervous system
What does the motor neuron do
Carries electrical impulses from the cns and is connected to the effector
What does the relay nueron do
Passes electrical impulses from the sensory nueron to the motor nuerone found in the spinal coord
State the sensory relay
Stimulus -> receptor -> sensory nuerone -> relay nuerone -> synapse -> motor neurone -> effector ->response
What is a synapse
A gap where two neurones connect
How do impulses travel across a synapse
Electrical impulses travel to one end of a nerve cell and causes a chemical to be released called a neurotransmitter. The neurotransmitter then diffuses across the gap slower than an electrical impulse would
Examples of reflex actions
Breathing, swallowing
Function of cerebral cortex
Involved in consciousness, language, thought, perception, memory, attention
Function of Hypothalamus
Links nervous system to the hormonal system, controls feeding fleeing fighting and mating
Function of pituitary gland
Involved In hormonal control
Function of cerebellum
Contributes to coordination precision and accurate timing
Function of medulla
Unconcious activity e.g heartbeat, breathing, vomiting, and blood pressure
What is the retina
The thin lsyer of tissue at the back of the eye that recieves light and converts it inro neural signals
What does the optic nerve do
Carries impulses from the retina to the brain
What is the sclera
The tough outer layer of the eye
