They form a thin skeleton just inside plasma membranes called the cortical cytoskeleton to provide stiffness, structure, and shape to the
membrane.
5. Click on the Skeletal Muscle Cell. Muscle fibers contain bundles of myofibrils. Myofibrils are…
|Actin |A protein found in muscle cells. It is the main component of the thin filaments. |…
The thin filaments (actin) contain a polypeptide subunit G actin that bear active sites formyosin attachment True …
When muscle cells begin to repolarize, first the acetychloine is removed from the receptors on the cells. This in turn causes the receptor mediated Na+ leak channels to close. Voltage gated potassium leak channels open as a result. As K+ ions begin coming into the cytoplasm to repolarize. When the membrane potential reaches a specific level, the voltage gated potassium leak channels close as well. The sodium potassium pump works throughtout this process, by pumping Na+ ions out and K+ ions into the cells (using ATP, by a process called active transport).Ca2+ ions are pumped back into the SR by means of active transport. The membrane potential is then restored to the resting potential of…
Muscular System: The muscular systems is responsible for maintaining posture, circulating blood, and movement. Visceral muscle is found inside of organs like the stomach, intestines, and blood vessels. The stomach secretes acid and enzymes that digest food. The muscular system also has another variant which is skeletal muscle. The skeletal muscles are attached to bones and move various parts of the body. The biceps, pectoralis major, triceps, nasalis, and deltoid are five major organs in the muscular system. The biceps main job is to control the movement of the elbow and shoulder. The pectoralis major make up most of the chest bulk. The triceps help extend and retract the forearm. The nasalis compress nasal cartilage. The deltoid is responsible…
9. Myosin heads pull on the thin filaments, sliding them toward the center of the sarcomere.…
The sarcomere contains overlapping actin and myosin. The myosin is often called the thick filament because the myosin heads make it appear thick. The actin is, therefore, the thin filament The process by which the thin filaments are pulled in towards each other by the myosin is called cross-bridge cycling. It is how muscles contract. 3…
What is a cross bridge, where does it form, what molecules are involved, when and how does it form?…
The ribosomes are the site of protein synthesis. Peroxisomes contain enzymes for detoxification. One of the enzymes within peroxisomes is catalase. Catalase is involved in the breakdown of hydrogen peroxide. Microfilaments are made of actin. They form the cells cytoskeleton. Centrioles are composed of microtubules. Centrioles are at the base of cilia and flagella. They are also involved with cell division. Ribosomes are assembled in the nucleoli. The nucleolus is a spherical area within the cell nucleus.…
The fibers are not striated, and the fibers are short. The sizes of the fibers are quite small; smaller than the skeletal cells in fact.…
An activity that primarily utilizes type I muscle fibers is long distance running. Type I fibers are generally slow-twitch fibers, meaning they contract slowly and have a high capacity for aerobic glycolysis. Ectomorphs usually perform long distance running. In order to train slow twitch muscles (training slow twitch muscle fibers is for endurance purposes and other aerobic activities), one must increase the time under tension (TUT). Specifically, one must focus on doing higher reps (12-15) and low weights as well as doing the reps slowly with a shorter rest period than usual (possibly 30 seconds) in order to maximize and train the slow twitch muscle fibers. Slow twitch fibers are red, oxidative, contain a high content of myoglobin, utilize ATP slowly, produce a low amount of force, and have a high resistance to fatigue.…
Bone – formed from calcium salts deposited around proteins. Calcium salts are rigid, protein fibres provide elasticity and strength Areolar – contains cells called fibroblasts separated by non-living matrix. Collagen fibres for flexibility, elastic fibres for stretching. Found in skin, most internal organs (for expansion), muscles/blood vessels/nerves for protection. Adipose – large fibroblasts to store fat.…
Motor neurons connect to the sarcolemma of a muscle fiber at a folded motor end plate forming a neuromuscular junction.…
Match the following three terms with their definitions: Sarcolemma -plasma membrane of muscle cell Sarcoplasmic reticulum - plasma membrane of muscle cell Cytosol - intracellular fluid around organelles 6. Match the following three terms with their definitions: Terminal cisternae - part of sarcoplasmic reticulum—stores calcium ions T-tubules - part of sarcolemma—carries action potential Triad - T-tubule + 2 terminal cisternae 7. Myofibrils consist of contractile proteins called myofilaments. Name the two types and what they’re composed of: Thin filament composed of protein actin Thick filament composed of protein myosin 8.…
Have Dendrites, Cell Body, Myelin Sheath, Node of Ranvier and Synaptic Knobs. The cell body is located at the top…