Tag: bio-chemistry

Brunner's gland is present in 'duodenum'.

• An anatomic structure exclusive to rabbits that are located at the terminal part of the ileum is sacculus rotundus. 
  
• It is formed at the distal end of ileum and is expanded to form a small dilated spherical sac in a rabbit.
  
•  It is rich in lymphoid tissue. Hence, Sacculus rotundus is a dilated part as posterior end of the ileum.
  

Crypts are anatomical structures that are narrow but deep invaginations into a larger structure. One common type of anatomical crypt is the Crypts of Lieberkühn. Crypts of Lieberkuhn between the bases of villi in the intestine have the Paneth cells which secrete digestive enzymes.

So, the correct option is 'paneth cells'.

While the chyme is present within the small intestine, glands within this structure begin to secrete different types of digestive enzymes, called carbohydrases (amylase, proteases, and lipases or fat splitting enzymes). The glands responsible for these enzymatic secretions are found in the mucosal layer of the small intestine, called the crypts of Lieberkuhn.

An intestinal gland (crypts of Lieberkuhn) is a gland found in the epithelial lining of the small intestine and colon. The glands are named after German anatomist J. N. Lieberkuhn.

• The first man to witness a live cell under a microscope was Anton Von Leeuwenhoek.
• Robert Brown was responsible for discovering the nucleus of a cell.
• Matthias Jakob Schleiden started that all parts of the plant organism are composed of different kinds of cell.
• Theodor Schwann studied that cells had a thin outer layer which is today known as plasma membrane. He also concluded that the plant shows the presence of a cell wall is a unique character of plant cells.
• So, the correct option is " A-(i), B-(iii), C-(iv), D-(ii).

In 1665 Robert Hooke published his book Micrographia which detailed his observations and included drawings. This book was the first important work on microscopy, the study of objects through a microscope. At the end of the book, there are observations of the stars and moon as seen through a telescope.

Leeuwenhoek, a Dutch naturalist was the first to observe and describe various unicellular microorganisms like bacteria, protozoa etc. along with animal cells like RBCs, muscles fibres, through a specialized lens designed by him.

Rudolf Virchow modified the cell theory and gave the concept of 'omnis cellula e cellulae' - means new cells develop by division of the pre-existing cells. This is called theory of cell lineage or common ancestry.