A goiter is an enlargement of the thyroid gland that is associated with abnormal thyroid function. the worldwide incidence of go
iters is about 16%. third-world countries are especially vulnerable to serious health problems related to goiters. what element is deficient in the diet of most of the people who have goiters
A deficiency in the diet of the element Iodine [I] can lead to goiter. This is why in the U.S. we placed more of it in all table salt ("iodized salt").
The process of muscle contraction requires several steps.
The most famous theory on how the contraction and relaxation of muscles take place is the sliding filament theory.
However, this theory has been refined and one important addition to it is the mechanism by which myosin can pull actin and cause shortening of the sarcomere.
For the movement of myosin, it binds and releases actin and forms cross bridges.
Myosin is subdivided into two regions - S1 and S2. The contraction of the S1 region is what constitutes the power stroke.
An important requirement of the power stroke is the hydrolysis of ATP to release an inorganic phosphate which provides energy for the process.
