Physiology of Muscle Contraction:: Muscle contraction is a physiological process in which skeletal muscle fibers generate force and shorten to produce movement. This process allows the body to perform voluntary activities such as walking, running, lifting objects, writing, and maintaining posture. Muscle contraction occurs through a highly coordinated interaction between the nervous system, muscle fibers,…
Organization of Skeletal Muscle: Skeletal muscle is a specialized type of muscle tissue that is attached to bones and is responsible for voluntary body movements. It is called skeletal muscle because it is connected to the skeleton through tendons and works under conscious control. Skeletal muscles make up about 40–50% of the total body weight…
Salient Features and Functions of Bones: The human skeletal system is divided into two major parts: the axial skeletal system and the appendicular skeletal system. Together, these two divisions form the body’s framework, providing support, protection, movement, and stability. Although both systems are made of bones, they differ in their location, structure, and functions. The…
Types of Bones: Bones are the hard, living organs that make up the skeletal system. They provide shape and support to the body, protect internal organs, store minerals such as calcium and phosphorus, and help in the production of blood cells inside the bone marrow. Although all bones perform similar basic functions, they differ in…
Skeletal System and Joints: The skeletal system is the framework of the human body. It is made up of bones, cartilage, ligaments, and joints that work together to support the body, protect internal organs, and help in movement. An adult human has 206 bones, while a newborn baby has around 270 bones. As a child…
Physiological Acid Base Balance: Physiological acid–base balance refers to the mechanisms by which the body maintains the concentration of hydrogen ions (H⁺) within a very narrow range to ensure normal cellular and metabolic functions. The balance between acids and bases is essential for maintaining the pH of body fluids, particularly blood. Even slight deviations in…
Oral Rehydration Salt (ORS) is a scientifically formulated mixture of electrolytes and glucose used to prevent and treat dehydration caused by diarrhea, vomiting, excessive sweating, fever, and other conditions associated with fluid and electrolyte loss. ORS is considered one of the most important medical discoveries of the 20th century because it has significantly reduced mortality…
Electrolytes Used in Replacement Therapy: Electrolyte replacement therapy is the administration of essential ions to restore normal electrolyte balance in patients suffering from dehydration, electrolyte deficiencies, excessive fluid loss, metabolic disturbances, or certain disease conditions. Electrolytes play a crucial role in maintaining fluid balance, nerve conduction, muscle contraction, acid-base equilibrium, and cellular metabolism. Deficiency of…
Basic Principles of Wound Healing: Wound healing is a complex, highly coordinated biological process through which the body repairs damaged tissues and restores the integrity of the skin or other injured structures after trauma, surgery, burns, infections, or disease. The skin acts as the body’s primary protective barrier against physical injury, microorganisms, harmful chemicals, and…
Leprosy, also known as Hansen’s disease, is a chronic infectious disease caused primarily by Mycobacterium leprae and, less commonly, by Mycobacterium lepromatosis. It mainly affects the skin, peripheral nerves, mucous membranes of the upper respiratory tract, and eyes. Unlike many bacterial infections, leprosy progresses very slowly, often taking 2 to 20 years or even longer…