The endocrine system is a complex communication network that regulates reproduction, metabolism, growth, and energy balance through hormones—chemical messengers released into the bloodstream. These hormones act slowly but powerfully, influencing nearly every process in the body. The major endocrine organs include the pituitary gland, pineal gland, thyroid gland, parathyroid
The urinary system is one of the body’s most important cleansing systems. Every day, it works to filter blood, remove waste products, and keep water, electrolytes, and nutrients in balance. While often overlooked, it plays a central role in maintaining overall health. The system is made up of the
The digestive system is a complex network made up of the gastrointestinal (GI) tract and several accessory organs that work together to process food, absorb nutrients, and eliminate waste. The GI tract itself includes the mouth, esophagus, stomach, small intestine, large intestine, and anus, each playing a unique and vital
The respiratory system plays a vital role in sustaining life by facilitating the intake of oxygen and the removal of waste gases, primarily carbon dioxide, from the body. This continuous exchange is essential for cellular function and overall health. Anatomically, the respiratory system is divided into two main parts: the
The integumentary system is a complex network that includes the skin, nails, hair, and various glands. Together, these components form the body’s first line of defense, shielding us from harmful pathogens and environmental hazards. Skin is the largest organ in the human body, accounting for approximately 15–20% of
The immune system is a complex network of cells, tissues, and organs that work together to protect the body from harmful pathogens and abnormal cells. It is broadly divided into two main types of defences: innate immunity and adaptive immunity. Innate immunity serves as the body’s first line of
The cardiovascular system, made up of the heart and blood vessels, is responsible for delivering oxygen and nutrients to the body’s organs, enabling them to function properly. The heart acts as a muscular pump that keeps blood circulating throughout the body. Blood travels between the heart and lungs via
Inflammation is the body’s natural response in tissues with blood vessels, where immune cells and defense molecules are sent from the bloodstream to areas affected by infection or injury. This process helps eliminate harmful agents and promotes healing. Inflammation can be categorized as either acute or chronic based on
Hormones are chemical messengers produced by specialized glands and secreted into the bloodstream or body fluids. These powerful substances regulate a variety of physiological processes by acting on target cells located far from their site of origin. There are two main types of hormones based on their mechanisms of action.
Stress is a natural reaction, both psychological and physical, to events that the body perceives as threatening or challenging. It can affect everything from your senses and metabolism to your movement, emotions, thinking, immunity, breathing, and blood flow. When we sense or anticipate a threat, three key physiological systems kick
Your kidneys are bean-shaped organs located toward the back of your abdomen. They play a vital role in filtering waste products from your blood and maintaining the proper balance of body fluids. Each kidney contains tiny functional units called nephrons, where blood filtration and reabsorption take place. Here are five
Phosphorus is the body’s second most abundant mineral after calcium. It occurs naturally in a variety of foods and is also available as a dietary supplement. Due to its high reactivity, phosphorus does not exist in its free elemental form on Earth. Most of the body’s phosphorus (about