Sience Unit 1 Lesson 1 and 2
How does the nervous sysstem works
How can I protect my nervous system
the division of the nevous system
the nervous system an be divided into the central nervous system (CNS) and periphericalnervous system(PNS
The CNS is formed by the brain
and the spinal cord
the PNS is formad by
all the peripherical nerves
.These nerves include two
types:that form the somatic
system and those that form
the autonomic system
automatic system
is in charge of
regulatingseveral
involuntary or automatic
actions that keep us alive
The somatis system sends
information from the body to the brain
or spinal cord.It also
sends information
to the brain or spinal cord
Neurons
Our nervous system containscells called neurons.Neurons
are specialized cells which send and recive information in
the form of nerve impulses.Like all cells of our body,a neuron has a nucleus that holds genetic information
membrane that covers it
and a body called soma,
where most of the cellular parts are contined
It also has a long extension called
the axon .The axon is in charge
of transmitting impulses from the
soma to other neurons
Neurons also have
dentrites.Dentrites are branches that can recive information from other neurons.The conection ofone neuron with other is called synapse
Nervous system damge
Our nervous system can damage
by body lessions and illnesses.
Physical effects on our bidies souch as
lossof sensation or difficulty moving.
Behavioral efects, such as anxienty and changes of mood are also cmmon.
Sicial effects can also be present,such as job loss or problems at school.
Meningitis and Poliomielitis we
can affect the nervous system
-viruses and bacterias
-anybody con be afected
-nervous system
-headache,joint,vomiting and other
-death,epilepsy,deafness
-antiriral medication
-virus
-children unthe 5
-nervous,muscular system
-fever,stiffness,fatige and others
-It may cause paralysisi of the legs or even death
-No treatment,prevention through a vaccine
they answer the questions:
What causes it?
Who is affcted?
Which body system is affected?
What are some symptoms?
What are the effects?
What is the treatment?
Substance Use and Abuse
Drugs can be precipitation drugs,wich help people
suffering from pain or disease ,or reacreational drugs wichare taken for peasure such as nicotine,alcohol,and caffein
However,many of them are illegal
such as cananabis,heroin,and ecstasy.These drugs can damage the liver and the nervous system .They make addictionor physical or psychological dependence substance
Recreational drugs can be classified
as depressants or stimulants.Depressants
,such as alcohol,heroin,cannabis and solvents,slow down messages along the
nerves and in the brain.These are effects
that depressants have on the body:feelings of well-being,slowed thinking,slowed muscular activity,and hallucinations.Stimulants speed up messages and make you feel more alert
Cafeine and cola are estimulants.
