biology form 5 chapter 3.5

8/17/2019 Biology Form 5 Chapter 3.5

1/14

Practising aHealthy

Lifestyle


2/14

• To live a healthy lifestyle, we must notconsume chemicals that can impairthe functions of our nervous system. drugs & alcohols.

Examples of drug eruptions.(A) Bullous dermatitiscaused

by sulfathiazole

(B) Fixed drug eruption

caused by phenolphtalein

(C) Bullous erythema

multiforme

() iffuse photosensiti!ity

reaction.

https://en.wikipedia.org/wiki/Bullous_dermatitishttps://en.wikipedia.org/wiki/Bullous_dermatitishttps://en.wikipedia.org/wiki/Sulfathiazolehttps://en.wikipedia.org/wiki/Fixed_drug_eruptionhttps://en.wikipedia.org/wiki/Fixed_drug_eruptionhttps://en.wikipedia.org/wiki/Phenolphtaleinhttps://en.wikipedia.org/wiki/Erythema_multiformehttps://en.wikipedia.org/wiki/Erythema_multiformehttps://en.wikipedia.org/wiki/Photosensitivity_reactionhttps://en.wikipedia.org/wiki/Photosensitivity_reactionhttps://en.wikipedia.org/wiki/Photosensitivity_reactionhttps://en.wikipedia.org/wiki/Photosensitivity_reactionhttps://en.wikipedia.org/wiki/Erythema_multiformehttps://en.wikipedia.org/wiki/Erythema_multiformehttps://en.wikipedia.org/wiki/Erythema_multiformehttps://en.wikipedia.org/wiki/Phenolphtaleinhttps://en.wikipedia.org/wiki/Fixed_drug_eruptionhttps://en.wikipedia.org/wiki/Fixed_drug_eruptionhttps://en.wikipedia.org/wiki/Sulfathiazolehttps://en.wikipedia.org/wiki/Bullous_dermatitishttps://en.wikipedia.org/wiki/Bullous_dermatitis


3/14

Efects o Drugs

• Drugs = chemicals that can aect the

functioning of organisms.

• se for treating diseases medicine

• Drug a!use = the use of drugs without adoctor"s prescription #for see$ingpleasure%achieving what the users !elieve is!enecial. narcotics

•

'ects on the nervous system

interferingwith synapes

• Try drugs usually addicted tolerance #needto ta$e an increasingly higher dosage to achieve

the same physiological eects(


4/14


5/14

Drugs can be divided into 4 maingroup :

a( )timulants• *ncrease the activity of the central

nervous system

• '+amples caeine #coee, tea &cola drin$s(, nicotine #cigarettes(,cocaine & amphetamines.

•

Promote mental alertness, increaseheart!eat, dilate pupils, raise the!lood glucose level.

• -onstant stimulation of the -)

leads to its deterioration mental


6/14


7/14

!( Depressants

•

)low down the activities of thecentral nervous system.

• -apa!le of altering thefunctioning of the cere!rum &

give a false sense of well/!eing.• 0piates #opium, morphine,

heroine & codeine(, !ar!iturates,

tran1uilisers & anaesthetics#ether & chloroform(.

• 0piates 2 a!le to depress nervetransmission that leads to the

sensation of pain. sed as


8/14


9/14

Alcohol• 3 $ind of strong depressant that aect

coordination and 4udgement.

• 5ea$ens the functions of the !rain &aects vision, hearing & speech. 3higher dosage can impair coordinationneeded to maintain !alance.

• 'ect on the nervous system, alcoholslows down responses. *mpair

4udgement of distances.


10/14

c( Hallucinogens

–

3ect perceptions & causehallucinations.

– sers may see & hear thing which

are actually non/e+istent. – Tends to !e highly emotional.

– '+amples canna!is #mari4uana(

& L)D #D/lysergic aciddiethylamide(


11/14


12/14

D( arcotics

–

Heroin and morphine/drugs whichmimic$ neurotransmitters !y!inding to their receptor sites

–

*nclude feelings of euphoria, !loc$pain signals and slow downnormal !rain functions


13/14

FACTOR T!AT CA" #EAD TODR$% & A#CO!O# A'$E

a( )tress in the wor$ place, school or home.

!( *na!ility to cope, escapism.

c( Peer in6uence.

d( 'motional distress #an+iety & depression(

e( -uriosity

f( Having parents who ta$e drugs

g( 7elief of pain #addicted to theirmedication(

h( )ocial drin$ing & recreational use of !othsu!stance


14/14

(RACT))"% A !EA#T!*#)FET*#E

• Do not a!use drugs & alcohol

biology form 5 chapter 3.5

Documents