Structure of the Heart

The heart in all animals is a muscular organ. In human, it is placed in the position of the thoracic cavity just behind the sternum and is slightly tilted to the left. Thus, the heart-beat is felt on the left side. It pumps blood throughout the blood vessels to various parts of the body by … Read more

Blood Coagulation

Blood is a fluid connective tissue which is an essential component in the human body. If the body losses this fluid, it may cause life threatening. Through the clotting mechanism, the body defends against loss of blood. In this case, different coagulation factors, vascular mechanisms, thrombocytes, enzymes, prostaglandins and proteins play important role to clot … Read more

Enzyme : Properties, Classification and Functions

image of Activity of Enzyme

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 … Read more

Carbohydrate: Definition, Classification and Functions

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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 … Read more

Exocrine Glands Vs Endocrine Glands: Functions and Differences

image of Endocrine and exocrine glands

Glands are a group of cells or organs of the human or animal body which play an important role to secrete particular chemical substances for various body functions.  Generally, a gland consists of cuboidal or columnar epithelial cells which are located on a basement membrane. They are enveloped by a plexus or meshwork of blood … Read more

Lipid : Classification and Its Roles in the Living Organisms

image of Lipid

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 … Read more