Neuromuscular junction

LABORATORY REPORT Activity 2: Twitch Contractions and Summation PREDICTIONS Effect of Muscle Fiber Length on Contraction 1. As muscle fiber length increases: contraction force increases, becoming maximum at an optimal length, then decreasing at longer lengths. Effect of Stimulation Frequency on Contraction 2. As the frequency of stimulation increases, the force of contraction: increases. MATERIALS AND METHODS Measurement of Threshold Stimulus 1. Dependent Variable: contraction force

Stimulation Recording in Frog Sciatic Nerve Methods: Dissection of the Gastrocnemius Muscle and the Sciatic Nerve In this experiment the frog sciatic nerve was used; the frogs were carefully handled and deeply anesthetized in order to be permanently unconscious. Pithing was used to destroy the brain pain center making the frog insensitive to pain. The gastrocnemius muscle was dissected and the sciatic nerve was carefully removed. The frog ringer solution was prepared. The ingredients used included

PER- 415 Dr. Kyle Ryan 1.) In the article by Duchateau, Semmler & Enoka, they explained the importance of the behavior of single motor units that follow training. The Motor Unit is a vital part in both strength training and skill training. The motor unit is comprised of a motor neuron in the spinal cord, its axon and all of the fibers that innervates. Motor unit’s main function is to transform synaptic input that is received by the motor neuron. On average, 300 muscle fibers are innovated, however

Marigold Kotey 12/03/15 Case Study #4: Wearing on Her Nerves Dr. Fundaro Part I 1. What components of the nervous system are involved in physical sensation? How does sensory impulse move throughout the body? The components of the nervous system that are involved in the physical sensation is the peripheral nervous system, which is divided into two groups they are, sensory and motor divisions. The sensory impulse moves through the body by stimulating a receptor in the skin, and it goes through the

REVIEW SHEET EXERCISE 2 Skeletal Muscle Physiology NAME: Jasmine Young LAB TIME/DATE: 1. Define each of the following terms: • motor unit - A motor unit consists of a motor neuron and all of the muscle fibers it innervates. • twitch - Skeletal Muscle twitch is the mechanical response to a single action potential. It has three phases known as the latent, contraction, and relaxation phase. • threshold - the threshold is the minimal stimulus needed to cause a depolarization of the muscle plasma membrane

major reasons why this paper is considered a classic paper. Firstly it was the first paper to directly investigate the functional significance of motor neuron size and was one of a series of five papers published in 1965 linking many different neuromuscular concepts together such as recruitment, usage and motor neuron pool. (cite Amanda paper) Secondly it was the first paper to establish a set of rules that defined orderly recruitment of motor units coined the size principle. This relatively simple

Metabolic Superstorm 1. Fill in the chart below. Use “+” if the patient’s vital sign is higher than normal, “−” if the sign is lower than normal, or “x” if the sign is normal. If you need to, use your text or another resource to determine normal values. Vital Sign Increase/Decrease/Normal Respiration Rate + Heart Rate + Blood Pressure - Body Temperature + 2. If you were the doctors on the scene, what diagnosis would you give this patient? (You may

Case Introduction James Walsh, a 55-year-old-male presented symptoms including weakness inferiorly in his right lower limb and difficulty performing simple tasks such as walking or tying his shoelace. He also had some difficulties swallowing and often experiences unpredictable movements due to lack of control. As a result, he primarily uses a wheelchair and requires careful assistance when performing everyday activities. The function of James’ musculoskeletal system is primarily to facilitate movement

Introduction: The body consists of three different kinds of muscles: skeletal, cardiac and smooth muscle. Skeletal muscle, which is the primary focus of this lab, is made up of much smaller muscle fibers. These muscle fibers have smaller units called myofibrils followed by the smallest contractile unit of a muscle fiber called the sarcomere. Furthermore, the sarcomere is composed of two filament types- thick filaments, called myosin and thin filaments called actin. In order for muscle contraction

The introduction of this lab report discussed and elaborated how muscle contraction is an intricate and precise step-by-step process in the body. The concepts outlined at the introduction intertwine with the experiments performed in this lab. The experiments aimed to showcase the physiological cause and effect of skeletal muscle responses towards various situations. For instance, the first experiment demonstrated spatial summation through the form of muscle recruitment. The cause of this reaction