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.
There are a few foods that are rich in vitamin D. The Important dietary sources of vitamin D are fortified foods as well as vitamin supplements. Some of the biggest sources are dairy products, breakfast cereals and fatty fish (salmon and tuna). This is an oil soluble vitamin which contributes to important functions in the body.