Human Digestive System

This is the correct option as masticating the food is not a function of the tongue. Mastication is the function of the teeth, not the tongue.

This is the correct option. Ingestion is the process by which food is taken in by the organisms. Digestion is the process of converting complex food substances into simpler, absorbable form. Egestion is the process by which undigested food is removed by the body.

This is the correct option. Small intestines have a number of finger-like projections that increase the surface area for absorption of digested food.

This is the correct option. Small intestine absorbs the digested food and passes it on to the blood system.

This is the correct option. Liver secretes bile juice that helps in the digestion of fats.

Melena refers to the passage of black, tarry stools, which usually indicates upper gastrointestinal bleeding where blood has been digested.

Haemochromatosis is a condition of excessive iron absorption leading to iron accumulation in organs, causing damage to the liver, heart, and pancreas. It can be hereditary (genetic) or acquired. The condition results from increased intestinal iron absorption and can lead to organ failure if untreated.

In plants, P-protein is involved in transport of organic compounds through phloem. Many proteins are stored to serve as reservoirs of amino acids and nitrogen. For instance, seeds of many plants store nutrient protein required for germination and growth of seedlings. Similarly, ovalbumin of egg white provides nourishment to developing bird embryo and casein of milk provides nourishment to mammalian infants. Ferritin protein of bacteria and plant and animal cells stores iron.

Bile is produced by the liver and stored in the gallbladder; it is essential for the emulsification and digestion of fats in the small intestine.

This is the most abundant organic compound, most abundant biopolymer, and most abundant polysaccharide found on earth. Like those of amylose, molecules of cellulose are unbranched homopolymers of about ten to fifteen thousand D-glucose monomers which are, however, linked not by a, 1-4 but by P, 1-4 glycosidic bonds.

Endocytosis is the general process by which cells take in substances from the outside by engulfing them in a vesicle. Phagocytosis is a specific type of endocytosis often referred to as cell eating.

The liver is the largest internal organ and the largest gland in the human body. It performs numerous vital metabolic functions.

It is the simplest tissue and is the protective tissue of the body. The cells of the tissue are tightly packed and it forms a continuous sheet. It covers most of the organs and cavities within the body. It also forms a barrier to keep different body systems separate. The skin and lining of the buccal cavity, blood vessels, alveoli and kidney tubules are made of epithelial tissue. It helps in absorption of water and nutrients

The muscle tissue form the contractile tissue are made of muscle cells. Movement of body or limbs are brought about by contraction and the relaxation of the contractile proteins which are present in the muscle cells The movement of the internal organs such as heart and alimentary canal, are all caused by muscle tissues