Skeletal Muscle Contraction Case Study

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1) What is the role of calcium ions during contraction of a skeletal muscle?
Calcium is an important element for live. Calcium is found in the bones of animals and humans. In muscle contraction is produce as a result of Calcium ions , Ca2+, It comes from rapid release from the cisternae of the sarcoplasmic reticulum which cause a chemical reaction between ATP and the myofilaments. Another important function of Calcium ions occurs during the state of resting muscle. During the state of resting muscle, calcium Ion is “maintaining the relative impermeability of the cell membranes. If the calcium concentration falls, the potential difference across the membrane also falls so that muscles may spontaneously contract without activation by acetylcholine” This spontaneous contraction can cause spams. The presence of Calcium ion in skeletal muscle is also important to stimulus glycogen breakdown.
The low levels of calcium can also be the cause of muscle cramps. Muscle cramps are painful involuntary contraction that can take place in various muscles. (Dictionary of Biology, 2005).

2) The phrase all-or-none response describes a neuron-generated action potential. Explain what …show more content…

Many scientific have concluded that neurotransmitter have an important role in the production of hormones. Some researchers have found that patient with anorexia nervosa also have abnormal levels of certain neurotransmitter. Lower levels of the neurotransmitter serotonin are connected to bulimia, depression and food disorders; lower levels of nor epinephrine was found on anorexic patients. It is possible that abnormal levels of the nor epinephrine neurotransmitter could cause weight loss on anorexic patients. These are some examples that support the scientific researches. (Encyclopedia of Obesity and Eating disorders,

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