Human Body and Health Quiz

The lacrimal glands, located above each eye, secrete tears to lubricate and protect the eyes. Tears contain water, electrolytes, antibodies, and enzymes that maintain eye health and wash away irritants.

The liver is the largest internal gland and organ in the human body (weighing about 1.5 kg). It performs over 500 functions including detoxification, bile production, metabolism of nutrients, and synthesis of plasma proteins.

Short-sightedness (myopia) occurs when the eyeball is too long or the lens is too strong, causing light to focus in front of the retina. A concave lens diverges incoming light before it enters the eye, moving the focal point back onto the retina for clear vision.

Typhoid (caused by Salmonella typhi) and cholera (caused by Vibrio cholerae) are classic water-borne diseases. They spread through contaminated water or food washed with contaminated water, not through air or direct contact.

Pyorrhea, also known as periodontitis, is an inflammatory disease affecting the tissues surrounding the teeth, primarily the gums. It causes gum infection, inflammation, and can lead to tooth loss if untreated. The other options (nose, heart, lungs) are unrelated to this condition.

Diabetes mellitus occurs when the pancreas produces insufficient insulin or the body becomes resistant to insulin effects. Insulin is the hormone responsible for regulating blood glucose levels by facilitating glucose uptake into cells. Without adequate insulin function, blood sugar levels rise dangerously.

The appendix is a finger-like projection attached to the cecum, which is the beginning of the large intestine. It is part of the large intestinal tract, not the small intestine, stomach, or liver.

A biopsy is a medical procedure where tissue samples are taken from a living body (in vivo) for microscopic examination to diagnose diseases like cancer. Post-mortem tissue analysis is called an autopsy, not a biopsy.

Barium sulfate is a radiopaque contrast medium used as a barium meal or enema to visualize the alimentary canal (digestive tract) on X-rays. The coating highlights the esophagus, stomach, and intestines, revealing structural abnormalities. It is not used for blood grouping or brain imaging.

Bronchitis is inflammation of the bronchial tubes, which are the air passages that carry air to and from the lungs. It is a respiratory tract disease affecting the bronchi, not the blood, bladder, or liver.

ECG (electrocardiogram) records the heart electrical activity and is the primary diagnostic tool for cardiac arrhythmias, heart attacks, and other heart conditions. It does not diagnose brain, kidney, or lung conditions - those use EEG, renal function tests, and spirometry respectively.

Dialysis is a procedure that artificially removes waste products and excess fluids from blood when kidneys fail to function properly. It is the primary treatment for kidney failure (renal failure), not heart weakness, brain diseases, or other conditions.

Vitamin K is essential for the synthesis of clotting factors II, VII, IX, and X in the liver. Without adequate Vitamin K, blood cannot clot properly, leading to bleeding disorders. Vitamins B1, B2, and D are involved in energy metabolism, vision, and calcium absorption respectively.

A normal adult human has approximately 5-6 liters of blood, which is about 7-8% of total body weight. This volume is essential for oxygen transport, nutrient delivery, waste removal, and immune function. Volumes of 3-4 liters are too low, while 8-12 liters are excessive.

An adult human skeleton typically contains 206 bones. This includes axial bones (skull, spine, ribs) and appendicular bones (limbs, girdles). Infants have more bones (~270) which fuse as they grow. Options 210, 260, and 300 are incorrect counts.

The pancreas secretes insulin, which regulates blood sugar levels. Bile juice is produced by the liver, peptic juice by the stomach, so these are incorrect.

The kidney's primary function is filtering blood and removing waste products like urea, creatinine, and excess salts through urine. It does regulate blood pressure indirectly, but waste removal is its main role.

Hemoglobin is the red pigment in red blood cells that binds to oxygen in the lungs and transports it to body tissues. It does not destroy bacteria, prevent anemia, or directly utilize energy.

The skin is the largest organ in the human body by weight and surface area. It protects the body, regulates temperature, and provides sensory information. The liver is the largest internal organ.