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.
Health Canada advises adults over the age of 50 to take a vitamin D supplement of 400 IU each day. Vitamin D is not found naturally in many commonly consumed foods. In Canada, some foods such as milk, soy or rice beverages and margarine have vitamin D added to them. Good food sources of vitamin D include certain kinds of fish, egg yolks and milk. The following table will show you foods that are a source of vitamin D.