Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Adolescence is defined as the period and process during which a child becomes mature in terms of his/her attitudes and beliefs for effective participation in society. It is the bridge linking childhood and adulthood, usually between years of age.
Addiction is a psychological attachment to certain effects, such as euphoria and a temporary feeling of well-being, associated with drugs and alcohol. With repeated use, the tolerance level of receptors increases, requiring higher doses.
Dependence is the tendency of the body to manifest a characteristic and unpleasant withdrawal syndrome if the regular dose of drugs/alcohol is abruptly discontinued. Symptoms include anxiety, shakiness, nausea, and sweating.
Opioids are drugs that bind to specific opioid receptors in the Central Nervous System () and gastrointestinal tract. Heroin, chemically known as diacetylmorphine (), is a depressant that slows down body functions.
Cannabinoids interact with cannabinoid receptors principally in the brain. They are obtained from Cannabis sativa and affect the cardiovascular system of the body.
Coca alkaloids (Cocaine) are derived from Erythroxylum coca. It interferes with the transport of the neurotransmitter dopamine and has a potent stimulating action on the , producing a sense of euphoria.
Smoking increases the carbon monoxide () content in the blood and reduces the concentration of haembound oxygen, causing oxygen deficiency in the body. Tobacco contains nicotine, which stimulates the adrenal gland to release adrenaline and nor-adrenaline.
Chronic use of alcohol leads to 'Liver Cirrhosis' and damage to the nervous system. Drug and alcohol abuse during pregnancy is known to adversely affect the foetus.
📐Formulae
💡Examples
Problem 1:
A patient shows symptoms of anxiety, shakiness, and nausea after suddenly stopping his long-term intake of . Identify the medical condition and explain its cause.
Solution:
The condition is called 'Withdrawal Syndrome'.
Explanation:
This occurs because the body has developed 'Dependence' on . When the regular dose is abruptly discontinued, the body fails to maintain homeostasis, leading to characteristic unpleasant symptoms.
Problem 2:
How does smoking lead to a reduction in oxygen supply to the body tissues?
Solution:
Smoking increases levels which compete with for binding to hemoglobin.
Explanation:
Tobacco smoke contains Carbon Monoxide (). has a higher affinity for hemoglobin than Oxygen (). It forms carboxyhemoglobin, which reduces the concentration of haembound oxygen, leading to hypoxia in tissues.
Problem 3:
Identify the source and the specific neurotransmitter affected by the drug Cocaine.
Solution:
Source: Erythroxylum coca; Neurotransmitter: Dopamine.
Explanation:
Cocaine is an alkaloid that interferes with the transport of dopamine. By blocking the reuptake of dopamine, it increases its concentration in the synaptic cleft, leading to excessive stimulation of the .