Cardiorespiratory System. Consists of the heart, blood vessels, and the respiratory system The _____ circulates blood through the body, carrying oxygen, nutrients, and other key substances to the organs and tissues that need them It also carries away waste products so they can be used or expelled. î î î.
There are two main sources of vitamin A, animal sources and plant sources. Known as retinol, animal sources of this essential vitamin contain preformed vitamin A. Vegetable sources contain carotenoids, such as beta-carotene, which is converted to retinol by the body.itamin A that comes from animal sources is well absorbed and used more efficiently by the body then other sources of the vitamin. The two main sources of vitamin A from animal products are beef liver and turkey giblets. Other sources of this fat soluble vitamin include: 1  Chicken liver. 2  Cod liver oil.
You can also contribute to your vitamin A intake by including good sources of beta-carotene in your diet, as this can be converted into vitamin A by the body. The main food sources of beta-carotene are: 1  yellow, red and green (leafy) vegetables, such as spinach, carrots, sweet potatoes and red peppers.itamin A. Vitamin A is also known as retinol and has several important functions. These include: 1  helping your immune system to work as it should against infections. 2  helping vision in dim light. 3  keeping skin and the linings of some parts of the body, such as the nose, healthy.