Human Biology covers how the human body is built, how it works, and how its systems interact to keep you alive and functioning. It includes cells, tissues, organs, physiology, growth, energy production, reproduction, adaptation, and the links between structure, function, health, and disease.
Key Takeaways The 10 Year Claim The Short Answer Your body does not become fully brand new every ten years. Many cells are replaced all the time, but different tissues renew at very different speeds. Some cells live only a few days. Some last for decades. Some parts can stay with you for most of … Read more
Key Takeaways MTHFR Basics Gene MTHFR stands for methylenetetrahydrofolate reductase, which is the name of both a gene and an enzyme. The enzyme helps your body use folate in methylation, which is a normal process that helps make and repair DNA, recycle homocysteine and support cell growth. Many people hear the word mutation and assume … Read more
Key Takeaways Methylation Basics Cell Switches Methylation is one of the ways your body controls cell work. It adds a small carbon group to certain molecules, including DNA, proteins and hormones. This can help turn genes up or down without changing the gene code itself. DNA methylation helps normal cells stay stable, repair damage and … Read more
Key Takeaways Bone Growth Pathways Growth Plates Long bones grow in length at growth plates, where cartilage is replaced by mineralized bone as children mature. The process depends on orderly cell turnover, blood supply and the arrival of mineral and collagen building blocks in the right sequence. Growth slows and then stops when growth plates … Read more
Key Takeaways Soft Tissue Healing Soft Tissue Types Soft tissue injuries affect muscles, tendons, ligaments, and fascia. These tissues help the body move, lift, twist, and stay stable. A strain affects muscle or tendon. A sprain affects a ligament. A bruise affects small blood vessels and nearby tissue. Most injuries heal in stages. The first … Read more
Key Takeaways Muscle Repair Muscle Stress Recovery after exercise begins with the stress created during the session. Lifting, sprinting, jumping and long endurance work all disturb muscle tissue, connective tissue, fluid balance and the nervous system. A useful session gives the body a strong enough signal to adapt, then leaves enough room for repair to … Read more
Key Takeaways Bioelectric Basics Charge Across Membranes Cells separate charged minerals between the inside and outside of the membrane. This separation creates a voltage, often called the resting membrane potential, and it exists in almost every living cell. Voltage in biology describes a difference in electrical charge, not a store of usable power like a … Read more
Key Takeaways Body Balance Homeostasis The human body is built to keep its inner state steady while the outside world keeps changing. This steady state is called homeostasis, which means balance inside the body. Body heat, blood pressure, water level, salt level, and blood sugar all need to stay in a safe range for cells … Read more
Key Takeaways Body Balance Steady Inside Homeostasis means your body keeps itself steady. Your body does this all day without you thinking about it. It adjusts temperature, blood sugar, fluid, minerals, stress hormones and energy. You feel better when these systems stay steady. Your body uses sensors everywhere. Your brain, nerves, liver, gut, muscles and … Read more