BIOL 2160 – 60+ Exam Questions on Muscle Physiology, Twitch Mechanics, Smooth vs. Skeletal Muscle – Louisiana State University

This document is a detailed and exam-aligned study guide for BIOL 2160 (Human Physiology) at Louisiana State University, featuring over 60 multiple-choice questions with correct answers, specifically designed to prepare students for Exam 4 of the course. The content focuses on muscle physiology, covering the structure and function of skeletal, cardiac, and smooth muscle tissues, the excitation-contraction coupling process, and the biochemical and mechanical aspects of muscle contraction and relaxation. Students will gain a strong understanding of muscle fiber anatomy, sarcomere structure, the roles of calcium, troponin, tropomyosin, ATP, and myosin in contraction, and differences between isometric and isotonic twitches. The document also explains fiber types (fast vs. slow twitch), glycolytic vs. oxidative fibers, and physiological adaptations from low- and high-intensity exercise. In addition, it explores smooth muscle contraction mechanisms, including the role of MLCK, calmodulin, and phosphatases, and key contrasts with skeletal muscle. This resource is especially helpful for students enrolled in nursing, kinesiology, pre-med, biomedical sciences, exercise physiology, or general biology programs. The Q&A format supports active recall and helps clarify key physiological concepts critical to academic success in human physiology and related courses. Keywords: skeletal muscle, cardiac muscle, smooth muscle, sarcomere, myofibrils, actin, myosin, troponin, tropomyosin, t-tubule, sarcoplasmic reticulum, calcium, ATPase, excitation-contraction coupling, muscle twitch, isometric, isotonic, slow twitch, fast twitch, glycolytic fibers, oxidative fibers, myoglobin, fatigue, MLCK, calmodulin, smooth muscle contraction, kinase, phosphatase