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.
Foods with Vitamin D3. Foods that contain vitamin D3 are few and far between. Natural foods that contain the highest amounts of vitamin D3 are foods most Americans do not like to eat like fish, fish liver, fish oil, and egg yolks.We can get vitamin D3 from sun exposure, but most of us are âstuckâ indoors behind desks most of the day.he preferred form of vitamin D is vitamin D3, or cholecalciferol. This is the more potent form of vitamin D that the human body makes with exposure to sunlight. Our bodies need vitamin D3 for a variety of functions.