Muscle contraction

within the body so that any small forces can be used to help the bigger forces which are needed. The muscle and bones come together to make a lever, this helps to turn a pivot joint also known as mechanic advantage. There are 4 areas of a lever such as the bone on our bones turn to lever arms, the joints turn to pivots, the muscles stimulate effort to move the force or load and the body parts give muscles strength to move what needs lifted. 1st class levers are very uncommon within the human…

Muscular Dystrophy is a disease which leads to muscle weakness and loss of strength. This disease begins at an early age and symptoms appear during the early stages of childhood and it progressively destroys and deteriorates the muscles. Among the many types of Muscular Dystrophy, the most common and severe form is Duchenne Muscular Dystrophy (DMD). Duchenne Muscular Dystrophy is an inherited disorder and unlike other forms of Muscular Dystrophy, it is the one that develops and worsens quickly…

skeletal muscles in the body. The cause of Myasthenia Gravis is a flaw in the transmission of the nerve impulses to the muscles in the body. When normal communication between nerves and muscles are distributed at the neuromuscular junction, Myasthenia Gravis occurs. In normal humans, when an impulse travels down a nerve, the nerve then releases a neurotransmitter known as Acetylcholine, which then binds to Acetylcholine receptors and are then activated and are then able to create a muscle…

Skeletal Muscle: Skeletal muscle makes up approximately 40 percent of a humans total body weight, and contains 50-75 percent of all body proteins, accounting for 30-50 percent of whole body protein turnover (Frontera and Ochala 2015). It contributes significantly to multiple bodily functions both mechanically and metabolically. In terms of our study its main function is to convert chemical energy into mechanical energy allowing individuals to generate force and power, and produce repetitive…

al 2016). In a single unit smooth muscle cell, gap junctions are used to send signals between the cells (Hill et. al 2016). However, in multiunit smooth muscles, the muscle cells function as independent units because there are few, if any, gap junctions (Hill et. al 2016). This would be used to describe a large artery or vein (Hill et. al 2016). Like skeletal muscles, smooth muscles use the contractile proteins actin (thin filament) and myosin (thick filament);…

Myasthenia gravis is a chronic autoimmune disease that targets the neuromuscular junction resulting in impaired impulse transmission and skeletal muscle weakness. The muscular weakness may exacerbate during periods of activity while improving after periods of rest, occurring with various severities. Muscles that control the eyes, eyelids, facial expression, swallowing, and talking can also be affected. Symptoms are presented as drooping of the eyelids, called ptosis, blurred or double vision,…

conduction velocity of action potentials. Muscle are either directly joined to the bone or connected by tendons, which by definition are resilient bundles of collagen fibers. Motor nerves innervate the fibers of the skeletal muscles, which is controlled voluntarily. The action potential in a muscle fiber allows for an increase in the influx of calcium causing what we know as a twitch. A twitch is a contraction of the muscle due to only one action potential generated. Muscle nerves govern…

lower the dumbbells back down, is the eccentric motion, . as i pause while the the dumbbels are at the top, is the isometric contraction. 2- Alternate Hammer Curl - as I curl the weight toward my shoulders, is the concentric motion. as I lower the weight back down, is the eccentric,motion. As the weight is held at the top of the hammer curl, is the isometric contraction. 3- Barbell Front Raise - as I raise the barbell straight in front of me, is the concentric motion. The second phase, as I…

assesses the muscles and the motor neurons that control them. The motor neurons that control the muscles transmit electrical signals that cause the muscles to contract. A thin needle with an electrode on the end will be place through the skin into the muscle. The electrode picks up the electrical signal from the muscle. The patient will be asked to use the muscle by contracting a muscle or by bending the arm. EMG measures the electrical activity of muscle during rest, minor contraction and…

The anatomy is quite complex but as for functionality, facial nerve is involved in the movements of muscles related to facial expression and laryngeal muscles. While testing, the patients are asked to give facial expressions. Cranial nerve VIII is a sensory nerve is responsible for hearing and senses of equilibrium. Although this more relates to speech and hearing but the testing…