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Category Archives for "Human Physiology"

Hormone, Definitions, Properties and Chemical Natures

The word ‘Hormone’ is derived from Greek word ‘hormao’ which means “I impel” or “I arouse to activity”. William M. Bayliss and Ernest H. Starling (1904) termed that important chemical substance as hormone though it was first proposed by W. B. Hardy. In animal physiology, it denotes a specific substance which is effective in a very […]

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Food and Nutrition

Every day we eat food to live. Food is any substance that is consumed by animals to produce energy and aids in the body’s nutrition and growth. It is the animal or plant origin that contains proteins, lipids, carbohydrates, vitamins, and minerals. These components are known as essential nutrients. The nutrients are taken by the […]

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Blood: Definition, Components and Functions

British physiologist William Harvey (1628) first of all expressed the plan of special type of system within the body. This system is called the blood circulatory system.  In our body, this special system perform several functions like carrying food substances, respiratory gases, excretory wastes, and control body temperature and metabolic activities, prevent infection and coordinate […]

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Lipid : Classification and Its Roles in the Living Organisms

Lipid is an organic compound of biological origin that is made up of carbon, hydrogen, and oxygen. Lipid is esters of fatty acids and glycerol of higher aliphatic acids. It is insoluble in water and soluble in fat solvents like chloroform, ether, benzene, and alcohol.Lipids comprise 0.5% of the living body. They are the naturally […]

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Carbohydrate: Definition, Classification and Its Functions

Carbohydrates are the most widely distributed compounds in both plants and animals. Plants can build up carbohydrates from carbon dioxide (CO2) by the process of photosynthesis. The living body contains 1 percent of carbohydrates. Many plants and animals contain large quantities of carbohydrates as reserve food material. They are the compounds which provide energy to […]

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ADH Vs Aldosterone: Definition, Functions and Differences

The endocrine system consists of a number of ductless glands which produces chemical substances, known as a hormone. Hormones work individually in very low concentration and take part in different chemical reactions or can act as a catalyst. They are generally protein in nature and never stored in any other place for future use except […]

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Enzyme : Properties, Classification and Functions

The enzyme is a substance that performs as a biological organic catalyst to enhance the chemical reactions. Enzymes are produced by cells but the presence of cell is not essential for their activity. All enzymes are protein in nature. Many enzymes are simple proteins and do not require any additional factor for their activity. Some enzymes […]

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Protein: Types and Its Functions

Protein is a polymer which is formed by one or more long chains molecular units called amino acids. It performs a variety of functions in essentially all biological processes.  Important functions are mechanical support, DNA replication, metabolic reactions, growth regulations, immune protection, transportation of molecules, storage of molecules, etc.It is an organic material of protoplasm […]

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