Question

The stomach of ruminants is mainly divided into four parts, but in camels which one part is missing?
(a) Abomasum
(b) Omasum
(c) Reticulum
(d) Rumen

Answer 1

Hint: It is a compact spherical organ, comprising the canal and body. The flexibility of this canal is correlated with that of the reticulorumen, although the body contractions happen independently of and at a slower rate than reticulo ruminal contractions.

Complete answer:
The stomach of ruminants is divided into 4 chambers, rumen, reticulum, omasum, and abomasum. A few ruminants like camels and deer don't have omasum. The omasum is the third chamber within the ruminant stomach. It exists in the intrathoracic part of the abdomen.

The capacity and function of the omasum is helpful in absorption. Food can enter the omasum at the second biphasic reticular constriction.

Additional information: The inside of the rumen, reticulum, and omasum is secured only with stratified squamous epithelium like what is seen in the throat. Every one of these organs has an exceptionally unmistakable mucosa structure, despite the fact that, inside every organ, some provincial variety in morphology is watched. The inside surface of the rumen forms various papillae that change in shape and size from short and highlighted long and foliate. The reticular epithelium is thrown into folds that form polygonal cells that give it a reticular, nectar brushed appearance. Various little papillae stud the inside floors of these cells.
So the correct answer is ‘Omasum’.

Note: Within the omasum is thrown into wide longitudinal creases or leaves suggestive of the pages in a book (a lay term for the omasum is the 'book'). The omasal folds, which in life are pressed with finely ground ingesta, have been assessed to speak to about $33\%$ of the complete surface region of the forestomachs.