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.
Very few foods have vitamin D in them. Foods with a higher amount of vitamin D include fish, liver, and egg yolk. Excellent sources of vitamin D are foods and beverages that have vitamin D added to them.Cow milk always has added vitamin D. Orange juice, margarine, and soy beverage usually have it added. For other foods, check the label.xcellent sources of vitamin D are foods and beverages that have vitamin D added to them. Cow milk always has added vitamin D. Orange juice, margarine, and soy beverage usually have it added. For other foods, check the label.