Night-blindness

Anemia

Rickets

Drug

Medicine

Side-effect

Addictive

Recreational Drug

Caffeine

Cannabis

Ecstasy

Cocaine

Herion

Skeleton

Skull

Vertebra

Backbone

Biceps

Joints

Contract

Relax

Antagonistic Pairs

Triceps

Strength

Stamina

Speed

Organ Systems

Circulatory

Digestive System

Respiratory System

Aerobic Respiration

Social Behaviour

Stroke

Heart Attack

Fitness

Balanced Diet

Anorexia

Deficiency Disease

Nutrient

Kwashiorkor

Scurvy

Heartbeats Rate

Ciliated Epithelial Cells

Gas Exchange

Diaphragm

Breathing

Ventilation

Nicotine

Premature

Tar

Lung Cancer

S-factors

Suppleness