Muscle contraction

Muscle contraction is made possible when an action potential is propagated from a motor neuron to a muscle fiber. This occurs at the neuromuscular junction, where the neuron innervates the muscle fiber. One nerve can innervate thousands of muscle fibers, allowing for an entire muscle to contract. At each neuromuscular junction, muscle tissue (an excitable tissue) is able to receive an electrical signal from the motor neuron and propagate it further. As the electrical signal reaches the terminal end of the motor neuron, it passes into a region of the nerve called the motor end plate. This is a pocket formed around the end of a motor neuron by the sarcolemma, or the cell membrane of a muscle cell. Each motor end plate is mitochondria-dense because a lot of energy is needed for the release and re-uptake of the neurotransmitter acetylcholine. Once acetylcholine crosses the…

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 laboratory. The experiments aimed to showcase the physiological cause and effect of skeletal muscle response towards various settings. For instance, the first experiment demonstrated spatial summation through the form of muscle recruitment. The cause of this…

II.I How it is use? Muscle contraction requires the use of ATP molecules. Indeed, muscle cells are composed of contractile elements: sarcomeres. Muscle contraction is due to the slippage of myosin fibers on the actin fibers. For this, the head of the myosin binds to the troponin site of the actin filament. Then, an ATP molecule will bind to myosin to separate actin and myosin and thus allow its attachment to the neighboring troponin site due to hydrolysis of ATP in ADP + Pi. This creates a…

weaknesses in both upper and lower extremities. He finds it difficult to lift heavy objects off a shelf. When sitting on the floor he has to hold onto objects such as a chair to pull himself up. On examination, there is significant wasting of muscles in the shoulders, upper arms, and hips. There is significant weakness on muscle testing (i.e., the patient is unable to exert a normal force with muscle contraction). On tapping the knee tendon there is a contraction of the quadriceps muscle in the…

The use of neurons and muscle is utmost for any animal’s survival. The experiment studies the principles of muscle contractions and nerve conductions, and the characteristics of muscle twitches and AP. The nerve and muscle work in conjunction and allow organisms to be motile. Thus looking at the properties and understanding the process has immense influence on science and the world in general. Through the experiment it was determined that an increase in stimulation amplitude in both muscle and…

“A muscle is a tissue composed of cells or fibres, the contraction of which produces movement in the body.” (Dictionary) There are three different types of muscle; voluntary skeletal muscle, involuntary smooth muscle and cardiac muscle. Muscles have many different functions within the body. One function of muscle is movement. It is the only tissue in the body which is able to contract and therefore can move more than other body parts. Another function is the maintenance of posture. The muscles…

Muscle contraction is a process leading to the shortening and or development of tension in muscle tissue. Tension is developed in muscle tissue when muscles contract. That tension may or may not lead to movement. To contract means to shorten; however, this is not always the case in a muscle contraction. The tension may cause muscle to remain the same, elongate, or condense. When muscles decrease in length (e.x. lifting weights) it is called a concentric contraction. When muscles increase in…

When you lift a heavy weight (be it yourself or a barbell), your muscles contract. That contraction begins when your nervous system sends a signal to your muscle fibers. When a movement is performed over and over again, and the muscle fibers repeatedly receive an identical signal, a more efficient neuromuscular motor pattern develops. The process by which neurons become more efficient is called myelination. Through regular practice of a movement, a fatty white substance forms a sheath around…

The three types of muscle contraction that will be discussed in this report are isotonic, isometric and isokinetic contraction. Isometric contraction is also known as static contraction and provides the most benefits to immobilized individuals who are currently in rehab due largely to the fact that it involves the strengthening of the muscle with apply force to the joint. Isometric contraction involves the muscle generating force however there is no change in the angle of the joint. As a result…

When bones and muscles connect a joint is formed. At this point both are joined together by the help of tendons, which is a connective tissue. When we have to move a joint the muscle receives an electrical signal from brain. It causes movement to occur, because this causes the contraction in it. This contraction pulls on the corresponding bone at its insertion point. Stationary bone is called the point of origin for the skeletal muscle, while the one which moves is known as the point of…