Digestion

... humans, digestion begins in the mouth where food is chewed with the teeth . The process stimulates exocrine glands in the mouth to release ... esophagus ) while birds may develop a gizzard (or a stomach that acts as teeth and mechanically digests food). A herbivore may have a cecum that ...

Leaf

... (chestnut) coarse-toothed: with large teeth glandular toothed: with teeth that bear glands. denticulate: finely toothed doubly toothed: each ... such as Humulus (hop). serrate: saw-toothed with asymmetrical teeth pointing forward, such as Urtica (nettle) serrulate: finely serrate ...

Anatomy

... Arm Back Buttock Chest Ear Eye Face Genitals Head Joint Leg Mouth Neck Scalp Skin teeth Tongue Other anatomic terms (not classified): Artery Coelom Diaphragm Gastrointestinal tract Hair Exoskeleton ...

Collagen

... modification, for which vitamin C is required. This is related to why vitamin C deficiencies can cause scurvy , a disease that leads to loss of teeth and easy bruising caused by a reduction in strength of connective tissue due to a lack of or defective collagen. The white collagen that makes up ...

Evolution

... . A vestigial organ or structure may exist with little or no purpose in one organism, though they have a clear purpose in others. The human wisdom teeth and appendix are common examples. Genetic sequence evidence Comparison of the genetic sequence of organisms reveals that organisms that are ...

Joint

... Examples of fibrous joints are: Cranial sutures , joining the bones of the cranium . Gomphoses , the joints between the roots of the teeth and their sockets (or alveoli ) in maxilla and mandible . See also: condyloprotector , arthritis . ...

Paleontology

... trip on the Beagle and examined petrified forests in Patagonia. Thomas Jefferson took a keen interest in mammoth bones. Besides looking at mammal teeth and digging up penguins , George Gaylord Simpson played a crucial role in bringing together ideas from biology, paleontology, and genetics to help ...