Explain the basic concept of energy, Biology

Assignment Help:

Explain the basic Concept of Energy?

Energy in simple terms may be defined as the ability, or power, to do work. As a student of dietetics and nutrition, you already know that he physiological sources of energy are carbohydrates, protein, fats - the macronutrients present in food. Energy is released by the metabolism of food and the potential energy value of foods is expressed in terms of the kilocalorie (Kcal). A kilocalorie is defined as the amount of heat required to raise the temperature of 1 kg of water through I' Celsius (centigrade). Internationally, you may notice that the unit of energy measurement commonly used is the Joule (J). It expresses the amount of energy expended when 1 kg of a substance is moved 1 meter by a force of 1 Newton. The conversion factor for changing kilocalories to 1ciIojoules is 1 kilocalorie = 4.184 kilojoules. The amount of heat energy (kilocalorie) per grim1 that can be made available to the body by each of the energy-yielding macronutrients - carbohydrate, protein, fat - must be known to you. Yes, 1 g of carbohydrates yields 4 Kcal, 1g of fat yields 9 Kcal, and 1 g protein yields 4 Kcal. These values are known as the physiological fuel factors; Do you know how the energy in various foods is generally measured? The amount of energy available in a food is precisely determined by a laboratory technique known as calorimetry. In this process, a weighed amount of food is placed inside a metal container called a bonzb calorimeter, which is immersed in water. The food is then ignited in the presence of oxygen and burned. The increase in temperature of the surrounding water is measured and used in calculating the number of kilocalories given off by the oxidation of the food, an alternate method of measuring food energy is to use the macronutrient composition of foods in the food composition tables and by using the physiological fuel factors referred to earlier. The Indian Council of Medical Research (ICMR), India has published food value tables in a book titled 'Nutritive Value of Indian Foods'. Certainly, as a student of nutrition or dietetics, you may have referred la this book some time or other.


Related Discussions:- Explain the basic concept of energy

What are similarities between proteins, What are some similarities between ...

What are some similarities between proteins, carbohydrates, and nucleic acids?

How will consuming fewer than 1, How would consuming fewer than 1,200 kcalo...

How would consuming fewer than 1,200 kcalories per day impact metabolism.

Absorption of amino acids and peptides, Absorption of amino acids and  pep...

Absorption of amino acids and  peptides Generally,  the  dietary proteins are almost comp!etely  digested to their constituent amino acids and these are rapidly absorbed  from

Improvement of cereal proteins - mutual supplementation, Define Improvement...

Define Improvement of cereal proteins - Mutual supplementation? Improvement of cereal proteins: Cereals, in general, are limiting in lysine and threonine while legumes, milk, m

Define the chromosome region, Q. How is the chromosome region where the cen...

Q. How is the chromosome region where the centromere is located called, and how chromosomes classified in the relation to the position of their centromere? The chromosome regio

What are the major types of lipids, Q. What are the major types of lipids? ...

Q. What are the major types of lipids? The main types of lipids are phospholipids, triglycerides (fats and oils), waxes and steroids.

Define termination phase - mechanism of protein synthesis, Define Terminati...

Define Termination phase - mechanism of protein synthesis? Termination: RNA polymerase recognizes the terminator, which results in no further nucleotides being incorporated and

Regression of primitive streak, Regression of Primitive Streak As...

Regression of Primitive Streak As the inward migration of cells by the primitive streak ends progressively along its anterior to posterior regions the streak slowly regre

What is the meaning of prohaptor, What is the meaning of Prohaptor? The...

What is the meaning of Prohaptor? The specialized attachment sucker which surrounds the mouth in monogenean flukes. It comrpise adhesive structures which help attach the animal

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd