Body's immune system attacking the myelin sheath of nerves in the central nervous system

Affects activities of the brain and spinal cord

Disturbs coordination between the central nervous system and peripheral nervous system

Memory cells degenerate and die progressively

Usually occur in senior citizen

Individual experienced brain injury

Genetic factor

Lifestyle

Memory loss

Loss of intellectual and social skills

Unable to take care of themselves

Less secretion of dopamine

Usually occur in senior citizens progressively

Usually occur in man

Genetic factor

Shrinkage (tremor) of body

Movement becomes slow

Muscles become weak

Difficulty in balancing the body

Motor neurone degenerates and die 

Age factor, between 40-60

Genetic factor

Affects somatic nervous system

Skeletal muscle unable to function progressively

Finally, skeletal muscles for moving, ingesting, speaking and breathing are unable to function

Genetic factor

Premature baby, before 37th week or underweight

A pregnant mother who smokes, alcoholic and drug abuse

Unable to pay attention, become hyperactive and easy to get bored 

Stimulants drug:

• Examples: cocaine, nicotine, amphetamine, methamphetamine, ecstasy pill and caffeine
• Increase nervous system activities
• Effects: affecting the functions of the blood circulatory system (high blood pressure and heart failure), digestive system (loss of appetite) and nervous system (mood changes, vandalism, tendency to commit suicide), kidney failure and causing hallucinations and depression

Depressant drug:

• Examples: barbiturates, tranquillizer, morphine and heroin
• Delays activities of the nervous system
• Reduces blood pressure, relaxes muscles, relieves anxiety and promotes sleep
• Effects: memory loss, unable to pay attention, respiratory problems, lung cancer, liver and brain damage, muscle cramp, drowsiness, delirium and coma

Alcohol abuse:

• Influence someone's ability to think and make decisions
• Slowing reflex actions, poor muscles condition, failure to control body balance and difficulty in estimating distance
• Blurred vision, confusion and mental disorders

Body's immune system attacking the myelin sheath of nerves in the central nervous system

Affects activities of the brain and spinal cord

Disturbs coordination between the central nervous system and peripheral nervous system

Memory cells degenerate and die progressively

Usually occur in senior citizen

Individual experienced brain injury

Genetic factor

Lifestyle

Memory loss

Loss of intellectual and social skills

Unable to take care of themselves

Less secretion of dopamine

Usually occur in senior citizens progressively

Usually occur in man

Genetic factor

Shrinkage (tremor) of body

Movement becomes slow

Muscles become weak

Difficulty in balancing the body

Motor neurone degenerates and die 

Age factor, between 40-60

Genetic factor

Affects somatic nervous system

Skeletal muscle unable to function progressively

Finally, skeletal muscles for moving, ingesting, speaking and breathing are unable to function

Genetic factor

Premature baby, before 37th week or underweight

A pregnant mother who smokes, alcoholic and drug abuse

Unable to pay attention, become hyperactive and easy to get bored 

Stimulants drug:

• Examples: cocaine, nicotine, amphetamine, methamphetamine, ecstasy pill and caffeine
• Increase nervous system activities
• Effects: affecting the functions of the blood circulatory system (high blood pressure and heart failure), digestive system (loss of appetite) and nervous system (mood changes, vandalism, tendency to commit suicide), kidney failure and causing hallucinations and depression

Depressant drug:

• Examples: barbiturates, tranquillizer, morphine and heroin
• Delays activities of the nervous system
• Reduces blood pressure, relaxes muscles, relieves anxiety and promotes sleep
• Effects: memory loss, unable to pay attention, respiratory problems, lung cancer, liver and brain damage, muscle cramp, drowsiness, delirium and coma

Alcohol abuse:

• Influence someone's ability to think and make decisions
• Slowing reflex actions, poor muscles condition, failure to control body balance and difficulty in estimating distance
• Blurred vision, confusion and mental disorders