Pharmacology

A cell is a primary   structural and functional unit of an organism. It is the smallest living unit in the human body. It can perform 6 important life processes distinguishing living things from non-living things. Metabolism  Responsiveness Movement Growth Differentiation Reproduction Metabolism includes catabolism i.e. the breakdown of complex chemical substances into simple components and anabolism i.e., the formation of complex substances from smaller and simple components. For example, digestion catabolizes the proteinous food into amino acids. These amino acids are used by the body to make new proteins that are needed by the body. Responsiveness is the ability of the body to recognize and respond to changes. For example, Nerve cells respond by producing electrical signals called nerve impulses (action potentials). Muscle cells contract in response, generating force for the movement. Movement includes the motion of the body, organ, cell, or organelle inside the cell. In

Tissues are collections of cells and the materials that surround them that work together to perform a certain job, similar to how words are combined to produce sentences.  In the human body, there are just four basic types of tissue:  Epithelial tissue  Connective tissue  Muscle tissue  Nerve tissue Epithelial tissue lines hollow organs, body cavities, and ducts and covers body surfaces. It also forms glands. Connective tissue protects and supports the body and its organs. Various forms of connective tissue tie organs together, store energy reserves as fat, and aid in immunity. Muscular tissue produces the physical force required to move body structures as well as body heat. Nervous tissue detects changes in a wide range of internal and external situations and responds by generating action potentials (nerve impulses) that activate muscle contractions and/or glandular secretions. The majority of epithelial cells, as well as some muscle and nerve cells, are closely packed together to f