Animal Tissue and Anatomy

Gangrene is the local death of body tissue (necrosis) due to loss of blood supply or bacterial infection. Leprosy (Hansen's disease) is a chronic infectious disease affecting skin and nerves. Frostbite is tissue damage from freezing. Necrophilia is a psychological condition unrelated to tissue death.

The liver is the largest internal organ by weight, averaging 1.4-1.6 kg in adults. It performs vital functions including detoxification, protein synthesis, and bile production. The skin is actually the largest organ overall by weight and surface area, but among internal organs listed, the liver dominates. The brain weighs about 1.3-1.4 kg, making it second among internal organs.

Snails have four retractable tentacles on their head - two upper ones with eyes and two lower ones used for smelling and tasting. These lower tentacles function like noses, allowing snails to detect scents and food.

Snails have sensory tentacles on their head that function as olfactory organs. Most snail species have two pairs of tentacles - one upper pair and one lower pair - giving them four 'noses' or sensory receptors for smell and taste. The upper pair primarily handles vision and smell, while the lower pair is for taste and smell.

The French word 'livre' translates to 'book' in English. It's a false friend - 'liver' in English is an organ, while 'livre' is a book in French.

The orbicularis oris is the circular muscle that surrounds the mouth and is responsible for lip movements like puckering, closing, and kissing. This muscle encircles the oral opening and controls lip shape and position. The other options - infraspinatus, deltoid, and latissimus dorsi - are muscles located in the shoulder and back regions, not involved in facial expressions.

The appendix is a finger-like vestigial organ attached to the cecum, which is the pouch-like beginning of the large intestine. The cecum forms the connection point between the small and large intestines in the lower right abdomen. The appendix is not directly attached to the small intestine or jejunum.

Cows primarily sweat through their nose rather than their skin like humans. This is why they often pant and have moist noses as a cooling mechanism.

The skin is indeed the largest organ, but the surface area is approximately 20-22 square feet for an average adult, not 25 square feet. The 25 square foot figure is a slight overestimate.

The medulla oblongata is the lowermost part of the brainstem, connecting the brain to the spinal cord. It controls vital autonomic functions like breathing, heart rate, and blood pressure, making it an essential brain structure.

Pregnant cows have significantly higher protein requirements to support fetal growth and prepare for lactation. While energy from carbohydrates and fat is also important, the protein ratio must be increased specifically for tissue development and milk synthesis.

Rhino horns are made of keratin, the same protein found in hair and nails. They're not bone, muscle, or skin tissue. This is why rhinos are poached - their horns are similar to compressed hair fibers.

Babies are born without kneecaps (patella). The kneecap develops from cartilage between ages 2-6 years. Newborns DO have fingernails, eyelashes, and taste buds at birth.