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.
Surprisingly few foods contain vitamin D -- unless it's added to the food. That's because your body is built to get vitamin D through your skin (from sunlight) rather than through your mouth (by food).But once your body has enough, it doesn't matter whether you got it through your skin or through your stomach.There are three vitamin D super foods: 1  Salmon (especially wil d-caught).hat's because your body is built to get vitamin D through your skin (from sunlight) rather than through your mouth (by food). But once your body has enough, it doesn't matter whether you got it through your skin or through your stomach. There are three vitamin D super foods: