Question

The true stomach in the cow is called as:
(a)Rumen
(b)Abomasum
(c)Lumen
(d)None of the above

Answer 1

Hint: The cow's digestive tract consists of the following: mouth, esophagus, a four-compartment stomach (paunch, reticulum, omasum, and true stomach), small intestine, and large intestine.

Complete step-by-step answer:
The true stomach in the cow is abomasum and is the fourth chamber. It has glands, secreting acids and enzymes for digestion. It functions similarly to the carnivore stomach as it is glandular and digests food chemically, rather than fermentation like the other 3 chambers of the ruminant stomach. Gastric juices are produced in abomasum digest protein from both feed and ruminal microbes. Also, it receives and digests food from omasum and passes it on to the small intestine. The pH value of the abomasum is 2–3.

Additional Information:
 - Rumen- or paunch is the largest stomach compartment and is the first chamber in the alimentary canal of ruminant animals. The rumen acts as storage or holding vat for feed and can hold 25 gallons or even more material. It serves as the primary site for microbial fermentation of ingested feed and passes it to the reticulum.
- Lumen- It is the inside space of a tubular structure, such as an artery or intestine is known as lumen. It comes from the Latin meaning 'an opening’; it can refer to the interior of a vessel, such as the central space vein or capillary through which blood flows.

So, the correct answer is 'Abomasum'.

Note: A metabolic process that produces chemical changes in substrates by the action of enzymes or the enzymatic decomposition and utilization of foodstuffs, particularly carbohydrates by microbes, is known as fermentation. The intensity of fermentation depends on microbe numbers and takes place throughout the gastrointestinal tract of all animals.