BIOS 251 Exam 1 Review 2026/2027 | 56 Questions & Answers | Anatomy, Homeostasis, Body Planes & Cavities

This BIOS 251 Exam 1 Review 2026/2027 provides 56 review questions and correct answers across 8 pages, covering foundational concepts typically introduced early in human anatomy and physiology. The study material begins with the definitions of anatomy and physiology before moving into homeostasis, equilibrium, homeostatic imbalance, feedback mechanisms, anatomical terminology, levels of biological organization, body cavities, membranes, abdominal quadrants and introductory chemistry and biochemistry. The source identifies the course code as BIOS 251 and the academic year as 2026/2027 but does not identify a university, so no unsupported university affiliation has been added. A central section focuses on homeostasis and physiological regulation. Students review negative and positive feedback loops as well as the roles of stimuli, receptors, control centers and effectors. Thermoregulation is presented in the context of negative feedback, while childbirth is provided as an example of positive feedback. These concepts establish an important foundation for understanding how physiological systems maintain relatively stable internal conditions and respond to internal and external changes. The document also provides focused preparation on anatomical position, directional terminology and body planes. Topics include frontal or coronal, midsagittal, parasagittal, transverse and oblique planes, together with medial, lateral, superior, inferior, proximal, distal, anterior, posterior, intermediate, ipsilateral, contralateral, superficial and deep. Students also review the hierarchy of biological organization from atoms and molecules through macromolecules, organelles, cells, tissues, organs, organ systems and complete organisms. Another major area is body cavities and membranes. The review distinguishes the cranial cavity, vertebral canal, thoracic cavity, pleural cavity, pericardial cavity, mediastinum, abdominal cavity, pelvic cavity and combined abdominopelvic cavity. It additionally reviews mucous and serous membranes, visceral and parietal layers, the peritoneum, pericardium and pleurae, as well as the meaning of retroperitoneal. The abdominal section tests the major structures associated with the RUQ, LUQ, RLQ and LLQ. The final portion introduces basic chemistry and biochemistry relevant to anatomy and physiology, including protons, neutrons and electrons, atomic number, enzyme function, lipids, starch, cellulose, polypeptides and amino acids. The material therefore combines anatomical terminology with introductory physiological and biochemical principles that students may need to master before progressing to more detailed organ-system material. The topics represented in this review closely correspond to introductory material in Anatomy and Physiology 2e by Betts et al., which covers the language of anatomy, homeostasis, levels of structural organization and the chemical level of organization. This makes the textbook a suitable academic reference for further study alongside the uploaded BIOS 251 review. Relevant students: This resource is particularly suitable for BIOS 251 students, Anatomy and Physiology I students, biology majors, nursing and pre-nursing students, pre-medical students, allied health students, medical assisting students and other health-science students who need a concise Exam 1 review of anatomical terminology, homeostasis, body organization, cavities, membranes and introductory biochemistry. APA Reference Betts, J. G., Young, K. A., Wise, J. A., Johnson, E., Poe, B., Kruse, D. H., Korol, O., Johnson, J. E., Womble, M., & DeSaix, P. (2022). Anatomy and physiology 2e. OpenStax, Rice University. Keywords BIOS 251 Exam 1, BIOS 251 Exam 1 review, BIOS 251 questions and answers, BIOS 251 study guide, anatomy and physiology exam, anatomy exam questions, physiology exam questions, homeostasis, negative feedback loop, positive feedback loop, anatomical terminology, anatomical directional terms, body planes, midsagittal plane, frontal plane, transverse plane, body cavities, thoracic cavity, abdominopelvic cavity, cranial cavity, abdominal quadrants, RUQ LUQ RLQ LLQ, serous membranes, peritoneum, pericardium, pleurae, biological organization, anatomy and physiology chemistry, enzymes, lipids, amino acids, polypeptides, anatomy physiology Exam 1, nursing anatomy study guide, pre nursing anatomy, BIOS 251 exam review