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.
Our bodies make vitamin D after we are exposed to sunlight. Natural sources of vitamin D include oily fish, such as salmon, mackerel, sardines and tuna, and fish liver oils, eggs and beef liver.Vitamin D is often added to foods, including milk, yoghurt, fruit juice, margarine, bread, breakfast cereals and pastries.ur bodies make vitamin D after we are exposed to sunlight. Natural sources of vitamin D include oily fish, such as salmon, mackerel, sardines and tuna, and fish liver oils, eggs and beef liver.