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.
Vitamin D from foods. Only a few foods contain enough vitamin D to make eating them solely for this reason worthwhile. Food manufacturers are fortifying many foods with extra vitamin D. The richest food sources of vitamin D include the following: Cod liver oil. Salmon. Mushrooms. Mackerel. Tuna fish. Milk. Orange juice.