Muscle contraction

and the gastrocnemius. A dissection for both labs were performed to isolate the nerve and to isolate the gastrocnemius. Both experiments used LabChart to perform various stimulations on the sciatic nerve and the gastrocnemius muscle to observe the level of intensity, contraction, and voltage threshold caused by different stimulation pulses. Introduction When a neuron produces an action potential it could be due to chemical…

expose the gastrocnemius muscle. The gastrocnemius muscle was first separated from the tibiofibula bone, but left attached to the knee and the Achilles tendon. A 15 cm long piece of strong thread was tied tightly around the Achilles tendon of the heel of the frog for later attachment of the muscle to the force transducer equipment. The Achilles tendon below the tied string was then severed and the tibiofibula and femur bones were cut away and removed. The gastrocnemius muscle was kept moist in…

1. Skeletal muscle used ATP to contract. Then, ATP is broken down into ADP and P, which release energy. 2. A) The sarcoplasmic reticulum is the organelle that stores calcium in muscles cells. B) In order for calcium to be released from this organelle some events must occur. First, an action potential needs to reach the synaptic terminal. Then acetylcholine needs to be released into the sarcoplasm. After that, ACH molecules will land on receptors that are on the motor end plate. Then, an action…

his 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 response towards various situations. For instance, the first experiment demonstrated spatial summation through the form of muscle recruitment. The cause of this reaction was due to the…

Figure 1 Myosin and actin work together to generate motion within skeletal muscles, however, a vital means of communication, uniting motor neurons and muscles, must be present prior to movement. Tropomyosin and troponin maintain control over the contractions produced by myosin and actin and provide an essential outlet for dictating instructions. Tropomyosin, a two-stranded, alpha-helical coil protein, is positioned laterally along actin filaments and is responsible for “blocking” myosin heads…

Effects of Carbohydrate Ingestion Pre- Grip Strength Exercise on Muscle Endurance In the world of fitness, nutritional supplements are ingested with intent to maximize the results of strength exercise. In achieving favorable adaptations to exercise, sufficient nutrient consumption is critical. Also important is the timing of nutrient consumption, as greater benefits are observed when ingestion takes place in a time frame close to the exercise (Laurenson & Dubé, 2014). Previous literature…

Muscle Cramps As a recent victim of severe muscle cramps, I decided to take up the matter as the topic of my extra credit project. Muscle cramps are muscle spasms elongated for indefinite periods of time. Muscles contract involuntarily and forcibly, resulting in mild to intense pain that can last anywhere from seconds to over fifteen minutes. Muscle cramps can appear distorted or feel firmer than its normal, relaxed state. Muscle cramps have the ability to affect any skeletal muscle, whether…

The muscle fibers in the presence of ATP contracted 0.07cm and 3.3% change. Under the microscope, figure 1 shows the striated fiber by clearly indicating the bands and lines of the striation. In addition, solution B, with ATP plus Salt (KCl, MgCl2) contracted the muscle fiber by 0.24cm and 9.2% change. Finally, solution C, containing only salt (KCl, MgCl2) also contracted the muscle fiber by 0.13cm and 6.1% change. Figure 2 shows the effect after adding salt and shows the striations of the fiber…

Concentric contraction is when the muscle gets shorter when you flex your arms for example when you lift a weight/dumbbell towards your body that is a concentric contraction. These are the most common types of occurs in your body as it occurs in most day to day activities. Another example of this is the quadriceps when you do a squat movement when you get down to the bottom is the concentric contraction. Eccentric contraction is where the muscle lengthens when muscle moves so this is the…

stiffening of the muscles several hours after death. The calcium that is released from the sarcolemma has locked onto the myosin heads allowing it the cross bridge to connect indefinitely. The ATP that unlocks the head from the actin is no longer available after three to five hours after death. Eventually, as the muscles will degrade after 48 hours after death the actin and myosin. 2. Length-tension relationship states the amount of the tension generated by the contraction of the muscle…