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BIO 100 Exam 4 Study Guide Overview 2025 Questions and Answers Animal Body Hierarchy - ....ANSWER☑️☑️...-Cells -> Tissues -> Organs -> Organ Systems -> Organism Homeostasis - ....ANSWER☑️☑️...-Homeostasis is the body's ability to maintain a stable internal environment, even when external conditions change. Negative Feedback Loop - ....ANSWER☑️☑️...-A process that reduces or shuts down a response to bring the body back to balance. Example: When body temperature rises, the body sweats to cool down. Thermoregulation - ....ANSWER☑️☑️...-Endothermic animals generate their own heat internally (e.g., humans). Ectothermic animals rely on external sources to regulate temperature (e.g., reptiles). Homeotherms vs. Heterotherms - ....ANSWER☑️☑️...-Homeotherms keep a constant internal body temperature. Heterotherms allow their body temperature to vary with the environment. Function of the Digestive System - ....ANSWER☑️☑️...-Breaks down food, absorbs nutrients, and eliminates waste. Pathway of Food in Digestion - ....ANSWER☑️☑️...-Mouth -> Esophagus -> Stomach -> Small Intestine -> Large Intestine -> Rectum -> Anus FOR STUDY PURPOSES ONLY, ©️2025 ALL RIGHTS RESERVED 1