The movement of either eye into an up/right, up/left, down/right, down/left, up, down, right, or left position of gaze involves the linked and associated contractions and relaxations of multiple eye muscles, of the same eye and of the opposite eye, at the same time.ith the left eye looking to the right, if the IO muscle also were to contract, the front of this eye would move upward as well. Both eyes then would be looking up and to the right. This yoked or conjugate movement of these two muscles, right SR and left IO, is depicted in the first (top/left) image of the chart above.
Phytatesâwhich are present in whole-grain breads, cereals, legumes, and other foodsâbind zinc and inhibit its absorption [ 2, 12, 13 ]. Thus, the bioavailability of zinc from grains and plant foods is lower than that from animal foods, although many grain-and plant-based foods are still good sources of zinc [ 2 ].
Metallothionines in the intestinal cells are capable of adjusting the absorption of zinc by 15-40%. Thus control of cellular zinc homeostasis is maintained by zinc proteins and zinc binding metallothioneines. Zinc is needed for over 300 enzymes in the body and makes up part of 3000 different proteins in the body. Muscles (60%) and bones (30%) contain 90% of the bodyâs zinc. High concentrations of zinc are found in the prostate gland and semen and the choroid of the eye.