☰ Contents · Biology (Human body and health)

Cerebral hemispheres, nervous-system health, Lab 6

Lessons 48–50 · 3 lessons · O. Mavlonov, T. Tilavov, B. Aminov. Biology (Human body and health), Grade 8. Revised and expanded 6th edition. “O‘qituvchi” Publishing and Printing Creative House, Tashkent, 2019
49

Diseases of the nervous system and their prevention

Textbook: pp. 136–137
GoalExplain protecting the nervous system: first aid for fainting, the effects of harmful substances and general prevention (vaccination, avoiding head injury, routine).
New words
fainting · hushdan ketishconcussion · miya chayqalishiprevention · profilaktikapoliomyelitis, polio · poliomielit
Explanation

Nervous system disorders have different causes: some arise from infections (including viruses), injury, impaired blood supply or poisoning; diagnosis and treatment are for a doctor only. Poliomyelitis is a viral disease that damages the spinal cord’s motor neurons; vaccination protects children from it reliably, so following the vaccination schedule matters. Head injuries (blows, falls) can cause concussion; if there is dizziness, nausea, vomiting, drowsiness or fainting, tell adults at once and call 103. For a person who has fainted: lay them down, raise the legs slightly, let in fresh air, loosen the collar and belt, and call 103 if they do not come round quickly: if they are breathing, turn them onto their side into the recovery position and watch them; if they are not breathing, trained adults start CPR; give nothing to drink and do not hold ammonia to the nose. Alcohol, tobacco, nicotine and drugs damage nerve cells, worsen attention, memory and reaction time and cause dependence; one should not try them. For the nervous system sleep, movement, proper nutrition, limited screen time and a calm environment matter too.

Worked examples
A pupil at school suddenly goes pale and faints: lay down, raise legs, give air, call 103 if no recovery.
A child who bumps the head in a fall should tell adults and see a doctor, even if they look fine.
Class activity

Safety poster: “Protect the head” – helmet, sports rules, safe play; “If someone faints” – 4 steps. Show it at school and home. Do not try anything; do not fake-fall even in role play.

Practice
1
How are we protected from polio?
2
State first aid for a person who fainted.
3
Which signs after a head blow are warning signs?
4
Why are alcohol and drugs dangerous for the nervous system?