BIOS 252 Week 1 Online Lab; Muscular System

Natasha Ngong Chamberlain University College of Nursing BIOS 252: Anatomy and Physiology II Professor Horn July 14, 2024 Week 1: Muscular System Lab Report Describe the different muscle tissues using the table: (4 points) Fibers Voluntary or Involuntary Location Nervous system control: peripheral NS or Autonomic NS? Skeletal muscle They are long, Voluntary They are found Peripheral NS striated, throughout the body cylindrical and are connected to multinucleated. bones through tendons. Smooth muscle Non-striated Involuntary Smooth muscle Autonomic NS spindle-shaped, fibers are found in are uninucleated. the walls of hollow visceral organs like the liver, pancreas, and intestines. Cardiac muscle Striated long, Involuntary Located in and Autonomic NS branched around the heart only cells, shaped like cylinders and are uninucleated What is a sarcomere? (½ point) A sarcomere is the primary muscle fiber contractile unit in skeletal muscle composed of. a. Which contractile protein makes up the thick filament? (½ point) The contractile protein that makes up the thick filament is Myosin b. Which contractile protein makes up the thin filament? (½ point) The contractile protein that makes up the thin filament is Actin What ion binds to troponin and causes a conformational shape change to occur, moving the troponin away from the myosin head-binding sites? (½ point) Calcium ions bind to troponin, and troponin moves away from the myosin head binding sites. In the following image of a relaxed sarcomere, identify: (1 ½ points total; ½ point each) 915669180444Actin Actin Myosin Myosin Z-disc Z-disc Actin Actin Myosin Myosin Z-disc Z-disc Describe what is occurring at each of the 5 steps below. (2 1/2 points; 1/2 point each step) Step 1 The action potential is first received by the neuromuscular junctions. Step 2 Acetylcholine is realized from the ne