08 – Musculoskeletal System

In this episode of MCAT Prep Pod Biology Series we dive deep into the musculoskeletal system. We explore the structure and function of bones, muscles, and connective tissues, integrating high-yield anatomy and physiology with core MCAT concepts.

We begin with the skeletal system, covering axial vs. appendicular skeletons, bone types, and the anatomy of long bones including the diaphysis, epiphysis, and periosteum. We discuss bone cells like osteoblasts, osteoclasts, and osteocytes, and explain bone remodeling and calcium homeostasis via parathyroid hormone (PTH), calcitonin, and vitamin D. We also break down ossification processes, epiphyseal plate growth, and appositional growth.

Next, we move into joints and connective tissue, examining synovial joints, cartilage types (hyaline, elastic, fibrocartilage), and key structures like tendons and ligaments.

In the muscular system section, we compare skeletal, cardiac, and smooth muscle, including contraction mechanisms, the sliding filament model, and excitation-contraction coupling. We explain how calcium, troponin, and ATP interact during muscle contraction, and cover energy systems like creatine phosphate, anaerobic glycolysis, and aerobic respiration. You’ll also learn about muscle fiber types (Type I, IIa, IIb), rigor mortis, and oxygen debt.

Finally, we review essential disorders and physiological concepts like muscular dystrophy, myasthenia gravis, osteoporosis, rickets, muscle fatigue, tetanus, hypertrophy, and atrophy.

Perfect for mastering musculoskeletal anatomy and physiology for the MCAT, this episode includes mnemonics, visuals, and integrated concepts.