EEOB 2520 – Exam 1 | 2025/2026 | 100+ Solved Questions | Physiology, Homeostasis & Cell Communication – Ohio State University

This document presents over 100 clearly solved and A+ graded questions from the 2025/2026 EEOB 2520 (Principles of Physiology) Exam 1 at Ohio State University. It provides in-depth coverage of core physiological principles, including the purpose and mechanisms of biological actions, ATP-related equations, and the roles of biology, chemistry, and physics in physiology. It explains homeostasis through dynamic constancy, steady state, and feedback mechanisms (negative, positive, and feedforward), and applies this understanding to biorhythms, adaptation, and acclimatization. Additionally, the document thoroughly explores cell-to-cell communication mechanisms—such as gap junctions, neurotransmitters, paracrines, endocrines, and juxtacrines—as well as foundational content on cell types (epithelial, muscle, neuron, connective), tissue and organ organization, and the extracellular matrix (collagen, elastin, fibronectin). Key topics like the phospholipid bilayer, membrane structure, free radicals, bonding types, and fluid compartments (intracellular, interstitial, plasma) are also included. Ideal for undergraduates in biology, pre-med, and health science programs, particularly those enrolled in EEOB or physiology courses at OSU or similar institutions. A valuable resource for midterm preparation, concept review, and exam success in foundational physiology. Keywords: EEOB 2520, physiology exam, homeostasis, ATP equations, negative feedback, feedforward, cell communication, phospholipid bilayer, gap junctions, free radicals, extracellular matrix, reflex template, fluid compartments, Ohio State University