The digestive tract is the tube that extends from the mouth to the anus, and it consists of the (1) mouth, (2) pharynx, (3) esophagus, (4) stomach, (5) small intestine, and (6) large intestine. The accessory organs include the (1) teeth, (2) tongue, (3) salivary glands, (4) liver, (5) gallbladder, and (6) pancreas.ccessory organs The accessory organs include the â (1) teeth, â (2) tongue, â (3) salivary glands, â (4) liver, â (5) gallbladder, and â (6) pancreas. Figure 26.1Illustration showing the design and structures of the digestive system.
Nutrients such as omega-3 fatty acids, lutein, zinc, and vitamins C and E might help ward off age-related vision problems such as macular degeneration and cataracts, studies show. Regularly eating these foods can help lead to good eye health 1  : Green, leafy vegetables such as spinach, kale, and collards. 2  Salmon, tuna, and other oily fish. 3  Eggs, nuts, beans, and other non-meat protein sources. 4  Oranges and other citrus fruits or juices.
Sweet potatoes and carrots are excellent sources of provitamin A carotenoids that are good for your eyes. 1  Vitamin A from animal-derived foods is called retinol. This pre-formed vitamin A can be used directly by the body.