The sliding filament theory is the term for the process that describes how a thin filament slides across a thick filament to generate a muscle contraction. A series of steps take place so that the muscle can generate the tension required to contract.
A nerve impulse triggers the release of a chemical that causes calcium to be released from the endoplasmic reticulum. The calcium then binds with troponin. This molecule is now able to able to connect to actin. Energy from adenosine triphosphate, or ATP, permits the tropinin/calcium/actin molecule to pull the actin filaments so that the thin filament glides across the thick filament and causes the muscle to contract. The length of the contraction depends on how much ATP and calcium are present.Learn More
It is unclear how the term "Charlie horse" came to be a nickname for leg cramps. Its first use may have been part of baseball jargon.Full Answer >
According to Pearson Higher Education, the alanine cycle, or glucose-alanine cycle, is a process by which muscles can cycle the by-products of glucose breakdown to the liver to be turned back into glucose or flushed out of the body. This metabolic cycle occurs in the muscles, and it aids muscle cells that are using energy during periods of high activity, but do not have enough oxygen to complete aerobic respiration.Full Answer >
The process of throwing a shot put involves many muscles in the body starting at the bottom with the leg muscles, including the quadriceps, hamstrings and glutes. Other muscles such as the abs, pectorals, deltoids and triceps also play important roles in throwing a shot put, so full-body fitness is very important in order to do well at this sport.Full Answer >
"Horse breaking," a term sometimes thought to be inappropriate for the process, involves developing a cooperative relationship with a horse in preparation for the animal to accept commands from a human rider. The first step begins when the horse is a foal and is made to feel comfortable around humans. This is followed by the young horse learning to understand commands, walk in a circle at varying speeds at the end of a rope and ultimately accepting and responding to a rider.Full Answer >