Muscle Contraction Lab

1. In skeletal muscles, there are two main contractile proteins called actin and myosin. The regulatory proteins are tropomyosin and troponin. The thick myosin filament consists of polypeptide chains; 2 heavy chains and 4 light chains. 2 heavy chains wrap around each other spirally to form a double helical structure. One end of each chain folds into a myosin head. The thin actin filament consists of 3 protein components; actin, tropomyosin and troponin. 2 actin filaments wrap spirally around each

Ca2+ increases causing a contraction (9). Smooth muscle cell contraction is controlled by both receptor and mechanical activation of proteins actin and myosin and also changes to membrane potential. Ca2+ dependant contraction of smooth muscle mechanism When a stimulus is applied to smooth muscle, it causes an action potential, depolarizing the plasma membrane. Voltage gated calcium channels open allowing calcium into the cell. This increases calcium levels in smooth muscle cells.

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 to occur, these two filaments

Skeletal muscles are in the body are used every day in the lives of humans and many animals. Our body’s muscle contractions are voluntary, meaning that we do not need to tell out muscles when to contract thought our daily activities, which is a truly an amazing phenomenon happening in our bodies. There are three different types of muscle tissues, these are the skeletal, smooth and cardiac. The smooth muscle is apart of the involuntary muscle contraction, this type of muscle tissue is important

Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor

Exercise 2: Skeletal Muscle Physiology: Activity 3: The Effect of Stimulus Frequency on Skeletal Muscle Contraction Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. During a single twitch of a skeletal muscle You correctly answered: b. maximal force is never achieved. 2. When a skeletal muscle is repetitively stimulated, twitches can overlap each other and result in a stronger muscle contraction than a stand-alone twitch. This phenomenon is known as

thorough review of muscles on a physiological level is needed. Muscles are responsible for producing force and motion in the both the external world and within the body. Locomotion of the body and its organs is achieved via the contraction of three types of muscles: skeletal muscle, cardiac muscle, and smooth muscle. Our lab focuses on the effects of stimulation of skeletal muscle and more specifically, the relationship between a motor neuron and muscle contraction. Muscle contractions are caused by action

Nerve and muscle twitch recruitment: External electrode stimulation of a nerve or muscle can lead to a twitch so long as the stimulus voltage is above the muscle or nerve’s threshold value. Electrical stimulation works to open ion channels without the muscle cells, leading to the firing of action potentials. After some time, however, a maximal stimulus voltage will be found. Voltages above this lead to no significant increase in the amplitude of the twitch. Our expectation was that twitch amplitude

During exercise training, such as weight lifting or cycling, the muscles produce varying forces. Maximal voluntary contraction (MVC) is dependent on the training status of the individual, age, sex, heredity, disease/injury as well as the type of activity being performed [1]. Exercise can be categorized into two separate terms, anaerobic and aerobic activity. During aerobic exercise, such as endurance activities, slow-twitch (type 1) muscle fibers are recruited, which contain a large supply of myoglobin

actin - Release of Pi initiates the power stroke Steps that require Ca24: release of Ca from the cisternae of the sarcoplasmic reticulum Ca binds to troponin Assignment 3 1. Predict if healthy muscle or muscle with MH will contract with the most force. The MH muscles generates excessive contraction. 3. Even though screening tests exist, most people aren’t checked for the disease. Why not? What types of people (or what populations) would be most likely to be screened before they had their