Comprehensive Study Notes on Human Health, Substance Abuse, and Doping

Nutritional Deficiency Diseases

• Kwashiorkor: A disease primarily caused by a severe lack of protein in the diet.
• Marasmus: A condition resulting from a general lack of essential nutrients, including proteins and calories.
• Rickets: A disease caused by a lack of Vitamin D and calcium, which are essential for proper bone formation and strength.
• Scurvy: A disease resulting from a lack of Vitamin C ($\text{ascorbic acid}$).

Understanding Drugs and Substance Abuse

• Definition of a Drug: A drug is any substance taken into the body that changes the body and affects chemical reactions ($rxn$) within the body.
• Substance Abuse: This refers to the act of using legal or illegal drugs or substances in a wrong way or in excessive amounts.
• Commonly Abused Substances:
  • Legal drugs (medicinal).
  • Illegal drugs.
  • Tea, coffee, and energy drinks.
  • Tobacco.
  • Alcoholic drinks.
  • Chewing Khat ($\text{Catha edulis}$).

Classification of Drugs by Effect

• Stimulative Drugs: These substances increase the activity level of the nervous system.
• Sedative Drugs: These substances slow down the normal or proper working and functioning of the nervous system.
• Painkiller Drugs: These drugs dull the senses by affecting the specific areas of the nervous system responsible for producing the sensation of pain.
• Hallucinogens: These are drugs that alter the way an individual perceives things and reality.

Cigarette Smoking and Tobacco

• Source: Cigarettes are made from the tobacco plant.
• Addictive Properties: Smoking consists of a powerful addictive chemical known as nicotine.
• Primary Components of Cigarette Smoke:
  • Tar: A black, sticky substance that collects in the lungs. When the smoke cools, the tar leaches onto the lung tissue. This results in persistent coughing, which can lead to the bursting of alveoli.
  • Carbon Monoxide ($CO$): A poisonous gas found in cigarette smoke.
  • Nicotine: A substance with stimulating effects that leads to addiction.
• Associated Diseases:
  • Emphysema: A condition where the alveoli of the lungs have weakened walls or have burst, significantly impairing breathing.

Alcohol Consumption and Metabolism

• Absorption Process: When the human body consumes alcohol, it is absorbed through the walls of the stomach and the small intestine into the bloodstream.
• Metabolism in the Liver: Alcohol is absorbed by liver cells and broken down by specific liver enzymes. Due to this metabolic process, the concentration of alcohol in the blood decreases gradually over time.
• Immediate Effects of Alcohol:
  1. Loss of concentration.
  2. Loss of self-control.
  3. Slower reaction ($rxn$) time.
  4. Reduced judgment and impaired control of bodily movement.

Heroin and Natural Brain Chemicals

• Classification: Heroin is a powerful depressant that significantly slows down the central nervous system ($CNS$).
• Mechanism of Action: Heroin has a chemical reaction ($rxn$) similar to endorphins.
• Endorphins: These are chemicals made naturally in the brain that provide relief when the body experiences pain or stress.

Cannabis (Marijuana)

• Common Names: Also known as weed, pot, or marijuana.
• Active Component: Cannabis contains a stimulant or psychoactive component called tetra-hydrocannabinol ($THC$).
• Effects of Cannabis Use:
  • Short-term enjoyment or euphoria.
  • Difficulty concentrating.
  • Reduced short-term memory.
  • Panic attacks.
  • Hallucinations and false beliefs.
  • Increased appetite.

Chewing Khat (Catha edulis)

• Systemic Effect: Primarily affects the Central Nervous System ($CNS$).
• Active Chemical: Contains a chemical compound known as cathinone.
• Side Effects and Consequences:
  • Depressed mood.
  • Irritability.
  • Loss of appetite.
  • Medical issues such as gastric and peptic ulcers.
  • Difficulty sleeping (insomnia).

Doping in Competitive Sports

• Definition: Doping refers to the use of prohibited medical drugs or treatments in competitive sports.
• Regulatory Body: The World Anti-Doping Agency (WADA) uses a battery of blood or urine tests to determine if athletes are cheating.
• Why Doping is Prohibited: It is treated as a major violation because of the long-lasting side effects it causes. It impacts the cardiovascular system, $CNS$, respiratory system, and hormonal balance.
• Examples of Prohibited Substances: Alcohol, beta-blockers, and peptide hormones like Human Growth Hormone ($HGH$).
• WADA Criteria for Prohibiting a Substance:
  1. The substance has the potential to enhance sports performance.
  2. It represents an actual or potential health risk to the athlete.
  3. It violates the "spirit of sport."

Consequences of Doping

• Physical and Mental Health Risks:
  • Steroids: Increased risk of liver disease and cardiovascular issues (including high blood pressure and heart disease). They also cause acne and baldness.
    • In Males: Abnormal breast growth and shrinkage of the testicles.
    • In Females: Deepening of the voice, excessive hair growth, and enlargement of the clitoris.
  • Erythropoietin ($EPO$): Increases the risk of heart disease and pulmonary embolism. It can also cause general weakness.
  • Human Growth Hormone ($HGH$): Can cause severe headaches, loss of vision, diabetes, tumors, and enlargement of the hands and feet.
• Additional Consequences:
  • Psychological consequences.
  • Social consequences.
  • Financial consequences.
  • Sporting consequences (disqualification/bans).
  • Legal consequences.