Cardiac muscle (heart muscle). This type of muscle is found solely in the walls of the heart. It has similarities with skeletal muscles in that it is striated and with smooth muscles in that its contractions are not under conscious control. However this type of muscle is highly specialised.t has similarities with skeletal muscles in that it is striated and with smooth muscles in that its contractions are not under conscious control. However this type of muscle is highly specialised.
There are few natural sources of vitamin D. For that reason, most of the vitamin D in your diet comes from fortified foods, such as dairy products and alternatives, breakfast cereals, juices and margarine.
Five Foods Rich in Vitamin D. Vitamin D is a fat soluble vitamin that plays a vital role in the human body. It has many functions, and a lack of vitamin D can lead to serious health problems.Bone growth is severely impaired from vitamin D deficiency.Vitamin D promotes calcium absorption in the body, which leads to strong bones.hile there are not many natural foods rich in vitamin D, the following 5 have high concentrations of the vitamin. 1. Milk. Milk is an excellent source of vitamin D, as nearly all milk in this country is fortified with the vitamin. Fortification began decades ago when rickets became a significant health problem.