Digestion involves mixing food with digestive juices, moving it through the digestive tract, and breaking down large molecules of food into smaller molecules. Digestion begins in the mouth, when you chew and swallow, and is completed in the small intestine.

The endocrine system is instrumental in regulating mood, growth and development, tissue function, metabolism, as well as sexual function and reproductive processes. This system consists of a network of ductless glands that regulate and balance the body's hormones, PH, temperature and assimilation of light. The endocrine glands include the pineal, pituitary, thyroid, thymus, pancreas, gonads (ovaries and testes) and adrenals.

The diaphragm assists in respiration. When the scalenes and external intercostals contract while the diaphragm descends, your lungs inhale air. When your abdominal muscles contract and the diaphragm rises, you exhale.

Wastes in the blood come from the normal breakdown of active tissues, such as muscles, and from food. The body uses food for energy and self-repairs. After the body has taken what it needs from food, wastes are sent to the blood. If the kidneys did not remove them, these wastes would build up in the blood and damage the body. When nitrogenous waste products accumulate in the blood, it is an indication that the kidneys are not functioning properly.

The assimilation process of digested food in humans is very much complex as the digested food has to be utilized in a very proper way that can help human to live healthy life. The products of the digestion are finally absorbed through the lining of small intestine into the blood stream and become a part of the cell components, this is called assimilation. Blood carries these products to each and every part of the body. On reaching the cells they either take part in the synthesis of carbohydrates, proteins and fats of the human tissue or are metabolized to generate energy in the form of ATP which is used when required.

The amount of hemoglobin in the blood averages between 12 and 16 grams/100 milliliters of blood in adult females, about 14 and 18 in males, and somewhat less in children.

A virus is non living and relies solely on the 'host' for survival. Viruses are so primitive that many scientists consider them to be both living and nonliving things. By itself, a virus is a lifeless particle that cannot reproduce. But inside a living cell, a virus becomes an active organism that can multiply hundreds of times.

Skeletal muscle is the most abundant of the human body's tissues.

The majority of phosphorus found in the body is bound up with calcium in the bones as calcium phosphate, accounting for around 80% of the bodily total. The main component of bones and teeth is Calcium phosphate.

Zymase is a complex enzyme, which catalyzes sugar into alcohol and carbon di-oxide.

Acetobacter has the ability to convert sugar into acetic acid in the presence of oxygen.

Functions of kidneys are:

Blood does not clot inside the body because if a person containing antigen 'a', then serum must contain anybody 'b', serum could not contain antibody 'a' or your own blood will agglutinate.

To breathe underwater a diver must be supplied air at a pressure equal to that of the water surrounding the diver. Air of course is a suitable breathing mixture for a diver based primarily on nitrogen as the oxygen diluent. Beyond this depth helium is preferred as the diluent and is in fact particularly well suited to the depth. Helium does not cause narcosis at these pressures, is relatively inexpensive and is readily available.

Cooking oil is a plant, animal or synthetic fat used in frying, baking and other types of cooking. It is also used in food preparation and flavoring that doesn't involve heat, such as salad dressings and bread dips, and in this sense might be more accurately termed edible oil. When vanaspati is made, trans fatty acids are also produced; these increase the risk of heart disease when consumed in excess and are best avoided.

Sleeping on the left side is useful because it gives maximum relaxation to the muscles of the right side and keeps the liver warm and relaxed, and improves bile secretion.

Correct Answer: Only I

 The second major blood grouping system is the Rhesus (Rh) system. Like the ABO blood types, the Rh factor is an inherited blood protein, or antigen, on red blood cells.