General Biology

The liver is the largest internal organ and the largest gland in the human body. It performs numerous metabolic and detoxification functions.

The 11th and 12th pairs of ribs are called floating ribs because they do not attach to the sternum or to the cartilage of other ribs.

Viruses are considered the bridge between living and non-living organisms because they lack cellular structure and metabolic processes outside a host, but replicate and evolve within one.

World Leprosy Day is observed internationally on the last Sunday of January, which coincides with January 30th in many years, to honor Mahatma Gandhi's compassion for those affected by leprosy.

An Electroencephalogram (EEG) is a test used to evaluate the electrical activity in the brain. ECG is for the heart.

Melena is the passage of tarry black stools due to upper gastrointestinal bleeding, where blood is digested and darkened. Hematuria is blood in urine. Hypovolemia is low blood volume. Hyper apnea is not a standard medical term; likely meant hyperapnea (excessive breathing).

HIV (Human Immunodeficiency Virus) primarily targets and destroys CD4+ T-lymphocytes, which are essential components of the immune system.

Uric acid is the final oxidation product of purine metabolism in humans. High levels can lead to conditions like gout.

Malaria is caused by various species of the Plasmodium parasite, including P. vivax, P. malariae, and P. falciparum, all of which are transmitted by the Anopheles mosquito.

Menopause is the natural biological process that marks the end of a woman's menstrual cycles. Menarche is the first occurrence of menstruation.

A sphygmomanometer is a medical device used to measure blood pressure. It typically consists of an inflatable cuff and a mercury or mechanical manometer.

The average lifespan of a human red blood cell is approximately 120 days, after which they are removed by the spleen and liver.

Cyanocobalamin (Vitamin B12) is primarily found in animal products. Strict vegetarians (vegans) are at risk of B12 deficiency unless they consume fortified foods or supplements.

Streptococcus viridans (specifically viridans group streptococci) is the most common cause of infective endocarditis, particularly in previously damaged heart valves. Meningococcal and pneumococcal cause other infections. Leishmania causes kala-azar.

Streptomycin is considered the drug of choice for treating plague, caused by the bacterium Yersinia pestis, especially in severe or pneumonic cases.

Osteoporosis is a condition characterized by a significant reduction in bone density, which weakens the bone structure and increases the risk of fractures. Osteoclasts are cells that break down bone tissue, while osteomalacia refers to the softening of bones due to vitamin D deficiency.

Icterus is the medical term for jaundice, which is the yellowing of the skin and eyes caused by high levels of bilirubin in the blood. Malaria and typhoid are infectious diseases, and hemorrhage refers to bleeding.

Scurvy is a disease caused by a severe deficiency of vitamin C, which is essential for collagen synthesis. Beriberi is caused by vitamin B1 deficiency, and anemia can have various causes, including iron deficiency.

West Nile fever is a viral disease primarily transmitted to humans through the bite of infected Culex mosquitoes. Aedes mosquitoes are typically associated with dengue and Zika viruses.

Oropharyngeal thrush, or oral candidiasis, is a fungal infection caused by the overgrowth of Candida species, most commonly Candida albicans. Cryptococcus and Histoplasma are different types of fungi that typically cause systemic or respiratory infections.

The rate of physical growth in a child is most rapid during the first few months of life, particularly within the first four months. While growth continues throughout the first year, the velocity is highest in the early infancy period.

Trichomonas vaginalis is a common protozoan parasite that causes trichomoniasis, a frequent cause of vaginal discharge. Treponema pallidum causes syphilis, and Entamoeba histolytica causes amoebiasis.

Sand flies (Phlebotomine sand flies) are the established vectors for the transmission of Leishmania parasites, which cause Leishmaniasis. Dengue is transmitted by Aedes mosquitoes, and Malaria by Anopheles mosquitoes.

Indian tick typhus is a form of spotted fever caused by Rickettsia conorii, which is clinically similar to Rocky Mountain spotted fever. While the specific causative agents differ, they belong to the same group of tick-borne rickettsial diseases.

The glossopharyngeal nerve (IX cranial nerve) is responsible for taste sensation from the posterior one-third of the tongue. The V (trigeminal) nerve handles general sensation, and the VIII (vestibulocochlear) nerve handles hearing and balance.