Nervous System Flashcards
What sends signals to the central nervous system to create movement
The motor cortex
Characteristic of ALS
Degeneration of motor neurons
What are the symptoms of ALS
Twitching cramping slurred speech difficulty breathing swallowing and paralysis
What is the socioeconomic impact of ALS
250,000 people worldwide
Affects all ethnicities equally
Lifetime cost €250,000
What does MS attack in the body
The myelination of neurons
What are the symptoms of MS
Clinically isolated episodes lasting weeks to months
Relapse episodes cause further degradation of mylenation
Wide range of symptoms including weakness and fatigue
What is the socioeconomic impact of MS
2.5M worldwide all ethnicities affected equally
0.4M lifetime cost
What are the four main functions of electrically excitable cells
Sensing stimuli
Transmitting information
Contracting Muscles
Releasing neurotransmitters
What are the components of a neuron cell
Dendrites body which contains nucleus and axon to connect to other cells
What is the function of schwaan cells
Used in mylenation of axons to increase conduction speed across neurons
What is the myelin sheath formed from
Repeated schwaan cells
Gaps between are called ranvier nodes
What are the afferent signals
From periphery to CNS
What are the efferent signals
From CNS to periphery
What do thermoreceptors sense
Heat
What to nociceptors sense
Pain
