Humans do not have gizzards. Birds do have gizzards, because they do not have teeth. The gizzard’s function is to grind food in a bird's alimentary canal.Continue Reading
A gizzard is a part of a bird’s stomach. The gizzard’s walls are thick and made up of muscle. When a bird eats, the food goes through the esophagus and into the crop (a pouch-like structure).
From the crop, food enters the first part of the stomach, called the proventriculus, and the process of digestion begins. The gizzard contains grit, sand or small stones and is the second part of a bird’s stomach. These small stones pulverize food. Interestingly, all birds have gizzards, some insects and reptiles also have them.Learn more about Human Anatomy
Humans exhale oxygen, carbon dioxide and nitrogen. Humans inhale these same gases, though in different proportions to exhalation; that is, oxygen is exchanged for carbon dioxide during breathing.Full Answer >
Humans shed about 600,000 particles of skin every hour. This is about 1.5 pounds a year. By age 70, the average person will have lost 105 pounds of skin in their lifetime.Full Answer >
Humans have fingernails to protect sensitive skin on the fingers from cuts, burns and other damage. Nails on the fingers help people pick and pry, essentially serving as natural tools. They help with grooming by letting people brush off dirt and contaminants from skin and help people perform simple tasks like scraping off dog hairs from garments.Full Answer >
Humans have nails for protecting the tip of the digit, and the digital appendage is a leftover trait from your distant ancestors. Most vertebrates have keratinized structures composed of the same elements as horns. The hard layer provides protection against direct impact to the tips of fingers and toes.Full Answer >