1 grind and knead; "masticate rubber"
2 chew (food); "He jawed his bubble gum"; "Chew your food and don't swallow it!"; "The cows were masticating the grass" [syn: chew, manducate, jaw]
EtymologyFrom the past participle stem of later Latin masticare ‘chew’, from Greek μαστιχαν ‘grind the teeth’.
- 1832 — Charles
Pickwick Papers, ch. 4
- The fat boy rose, opened his eyes, swallowed the huge piece of pie he had been in the act of masticating when he last fell asleep, and slowly obeyed his master’s orders.
- 1892 — Herman
Melville, Typee: A Romance of the
South Seas, ch. 12
- 'By tasting it, to be sure,' said I, masticating a morsel that Kory-Kory had just put in my mouth.
- 1896 — H. G.
The Island of Dr. Moreau, ch. 8
- He resumed his meal. "I had no idea of it," he said, and masticated.
- 1927-1929— Mahatma
An Autobiography or The Story of my Experiments with Truth,
translated 1940 by Mahadev
- The vegetables were not to be cooked but merely grated fine, if I could not masticate them.
- 2001 - Nadine
Gordimer, The Pickup
- The friends watch the two make their way between other habitué's masticating, drinking, crouched in a scrum of conversation...''
- Russian: месить
Mastication or chewing is the process by which food is mashed and crushed by teeth. It is the first step of digestion and it increases the surface area of foods to allow more efficient break down by enzymes. During the mastication process, the food is positioned between the teeth for grinding by the cheek and tongue. As chewing continues, the food is made softer and warmer, and the enzymes in saliva begin to break down carbohydrates in the food. After chewing, the food (now called a bolus) is swallowed. It enters the esophagus and continues on to the stomach, where the next step of digestion occurs.
Cattle and some other animals, called ruminants, chew food more than once to extract more nutrients. After the first round of chewing, this food is called cud.
The chewing cycleMastication is a repetitive sequence of jaw opening and closing with a profile in the vertical plane called the chewing cycle. Mastication consists of a number of chewing cycles. The human chewing cycle consists of three phases
1. Opening phase: the mouth is opened and the mandible is depressed.
2. Closing phase: the mandible is raised towards the maxilla.
3. Occlusal or intercuspal phase: the mandible is stationary and the teeth from both upper and lower arches approximate.
Mastication motor programMastication is primarily an unconscious act, but can be mediated by higher conscious input. The motor program for mastication is an hypothesized central nervous system function by which the complex patterns governing mastication are created and controlled.
It is thought that feedback from proprioceptive nerves in teeth and the temporomandibular joints govern the creation of neural pathways, which in turn determine duration and force of individual muscle activation (and in some cases muscle fiber groups as in the masseter and temporalis).
The motor program continuously adapts to changes in food type or occlusion http://jn.physiology.org/cgi/content/full/92/2/773.
It is thought that conscious mediation is important in the limitation of parafunctional habits as most commonly, the motor program can be excessively engaged during periods of sleep and times of stress. It is also theorized that excessive input to the motor program from myofascial pain or occlusal imbalance can contribute to parafunctional habits.
In other animals
Chewing is largely an adaptation for mammalian herbivory. Carnivores generally chew very little or swallow their food whole or in chunks, a fact to which many dog and cat owners can attest. This act of gulping food without chewing has inspired the English idiom "wolfing it down".
Ornithopods, a group of dinosaurs including the Hadrosaurids ("duck-bills"), developed teeth analogous to mammalian molars and incisors during the Cretaceous period; this advanced, cow-like dentition allowed the creatures to obtain more nutrients from the tough plant life. This may have given them the advantage needed to usurp the formidable sauropods, who depended on gastroliths for grinding food, from their ecological niches. They eventually became some of the most successful animals on the planet until the Cretaceous–Tertiary extinction event wiped them out.
In machineryThe process of mastication has, by analogy, been applied to machinery. The U.S. Forest Service uses a machine called a masticator to "chew" through brush and timber in order to clear firelines in advance of a wildfire.
- http://jn.physiology.org/cgi/content/full/92/2/773 - Influence of age on adaptability of human mastication.
masticate in German: Kaumuskulatur
masticate in Modern Greek (1453-): Μάσηση
masticate in French: Mastication
masticate in Indonesian: Mastikasi
masticate in Italian: Masticazione
masticate in Japanese: 咀嚼
masticate in Korean: 씹기
masticate in Polish: Żucie
masticate in Russian: Жевание