Digestion converts macromolecules into absorbable units:
A unifying theme across all systems is —the maintenance of a stable internal environment despite external changes. Your body constantly adjusts its functions to keep temperature at ~37°C (98.6°F), blood pH at ~7.4, and blood glucose at ~5 mM (90 mg/dL). Most physiological processes operate via negative feedback loops : a change triggers a response that counteracts the initial change (e.g., sweating to cool a hot body). A smaller number of processes (like childbirth) use positive feedback , where a change amplifies the initial stimulus until a specific endpoint is reached.
The body is composed of eleven major organ systems, each with a distinct anatomical structure and a specific physiological role. anatomy and physiology of the human body
comes from the Greek words ana (up) and tome (cutting). It is the science of body parts and their relationships to one another. It ranges from gross anatomy (structures visible to the naked eye) to microscopic anatomy (structures seen only with a microscope, such as cells and tissues).
The are the dual foundations of medical science. Anatomy is the study of the body's physical structures—from the microscopic level of cells to the complex arrangement of organ systems—while physiology focuses on how those structures function and interact to sustain life. Together, they explain the "what" and the "how" of human biology, illustrating a central biological principle: structure determines function . Levels of Biological Organization A smaller number of processes (like childbirth) use
The human body is often described as the most sophisticated machine on Earth. It is a self-repairing, self-regulating, and self-replicating network of trillions of cells. To truly understand how we survive, move, think, and heal, one must study two interdependent disciplines: (the structure) and Physiology (the function). While anatomy asks, “What is it?” physiology asks, “How does it work?”
When a sperm penetrates an egg in the fallopian tube, a zygote forms. It implants in the uterus and develops into an embryo, then a fetus over 40 weeks. It is the science of body parts and
The adult human skeleton contains 206 bones, along with cartilage, ligaments, and tendons. It is divided into the Axial Skeleton (skull, vertebral column, rib cage – 80 bones) and the Appendicular Skeleton (limbs, shoulders, pelvis – 126 bones).
The most common mechanism. If a variable (like body temperature or blood sugar) moves too far from the "set point," the body triggers a response to reverse the trend. Positive Feedback:
Over 600 skeletal muscles constitute roughly 40% of body weight. Muscles are categorized into three types:
Ovaries (egg production), fallopian tubes, uterus (fetal development), cervix, vagina. Physiology (Female): The menstrual cycle (~28 days) involves follicular phase, ovulation (egg release), luteal phase, and menstruation if no fertilization occurs. Estrogen and progesterone regulate the cycle.