Homeostasis in humans refers to the self-regulating process by which biological systems maintain stability while adjusting to conditions that are optimal for survival. If homeostasis is successful, life continues; if unsuccessful, disaster or death ensues. The concept involves a dynamic equilibrium or balance within the body and includes several key aspects:

1. Temperature Regulation: The human body needs to maintain a consistent internal temperature. The hypothalamus in the brain acts like a thermostat, regulating and adjusting body temperature.

2. Blood Sugar Levels: Homeostasis of blood sugar levels is crucial for providing consistent energy to the body. The pancreas secretes insulin and glucagon to regulate blood glucose levels.

3. pH Balance: The body needs to maintain a neutral pH level (around 7.35-7.45) in the blood and bodily fluids. This is regulated through the excretion of hydrogen ions and bicarbonate in urine, and by the lungs expelling carbon dioxide.

4. Water and Electrolyte Balance: The balance of water and electrolytes (like sodium and potassium) is vital for proper cell function. This balance is maintained by the kidneys and hormones like antidiuretic hormone (ADH) and aldosterone.

5. Oxygen and Carbon Dioxide Levels: The respiratory system helps maintain a balance between oxygen and carbon dioxide levels in the blood to ensure efficient functioning of cells.

6. Blood Pressure: Maintaining a stable blood pressure is crucial for ensuring that all body tissues receive adequate blood supply. This is regulated by the heart, blood vessels, and certain hormones.

These processes involve various organs and systems in the body working together through feedback mechanisms. When these systems are disrupted, it can lead to health problems. For example, disruption in glucose homeostasis can lead to diabetes, and imbalance in calcium can affect bone health.