Tag: science & technology

Myopia (short-sightedness) occurs when the eye focuses light in front of the retina. A concave lens diverges light before it enters the eye, effectively shifting the focal point back onto the retina and correcting the vision problem.

Trachoma is a bacterial eye infection caused by Chlamydia trachomatis and is the world's leading cause of preventable infectious blindness. It affects the conjunctiva and cornea, leading to roughening of the inner eyelid and pain.

Pyorrhea, also known as periodontitis or periodontal disease, is a serious gum infection that damages the soft tissue and destroys the bone that supports your teeth. It's primarily caused by poor oral hygiene leading to plaque buildup.

Normal human body temperature is approximately 36.9°C (98.6°F), though it can vary slightly based on time of day, age, and individual factors. Options A and D are too low, while option C is the Fahrenheit equivalent

Vitamin K is essential for blood clotting as it helps synthesize clotting factors II, VII, IX, and X in the liver. Without adequate Vitamin K, blood cannot clot properly, leading to excessive bleeding. The B vitamins and D have other primary functions.

A normal adult human has approximately 5-6 liters of blood, which is about 7-8% of total body weight. This volume can vary based on body size, gender, and other factors. Options C and D are far too high.

Red blood cells (erythrocytes) are produced in the bone marrow through erythropoiesis, primarily in the flat bones like sternum, pelvis, ribs, and vertebrae. The liver, kidneys, and heart have other essential functions but don't produce RBCs.

An adult human skeleton has 206 bones. Babies are born with around 270 bones, but many fuse together during growth. The skull alone fuses from 22 separate bones in infancy to fewer in adulthood.

The pancreas secretes insulin, a hormone essential for regulating blood glucose levels by enabling cells to absorb glucose from the bloodstream. Bile is produced by the liver, and peptic juice refers to gastric secretions from the stomach.

The tibia, also called the shinbone, is the larger and stronger of the two bones in the lower leg (the other being the fibula). It connects the knee to the ankle and bears most of the body's weight.