DH+digestive+system+notes


 * Energy
 * must consume atoms in order to be made of matter
 * important to eat
 * we're constantly losing cells
 * need to eat, not just to have energy, but to have building blocks
 * have to be careful to not consume too many calories.
 * trans fat is a man made fat, really bad for you
 * saturated fat is an animal fat, bad for you
 * sugar comes from plants, but it's just the sugar molecule.
 * pure sugar is bad
 * fiber in plants is good
 * protein
 * everything cells do is done by protein
 * our DNA codes for protein
 * protein is really important
 * proteins are built out of amino acids
 * 20 different amino acids
 * only able to make 10 as humans
 * other 10 we have to eat
 * essential amino acids
 * don't eat, won't be able to make protein
 * DIE
 * Vegetarians can get protein from
 * eggs
 * milk (dairy)
 * fish
 * nuts
 * beans
 * rice
 * Vitamin A
 * if you don't get enough, you can go blind
 * involved in seeing
 * carrots are a good source of Vitamin A
 * Vitamin C
 * necessary to not get scurvy
 * involved in making a protein called collagen
 * collagen is about 25% of the protein in your body
 * collagen is in connective tissue, fill up the empty spaces in our body
 * Calcium
 * bones
 * Iron
 * for red blood cells
 * anemic if you don't have enough blood cells
 * role of digestive system
 * begins at mouth
 * a tube that's about 20 feet long (digestive track)
 * understanding the digestive system is understanding where things are absorbed and discharge
 * mouth
 * mechanical digestion (not small enough to be absorbed by cells)
 * sugar can be digested through mouth


 * Stomach
 * churn the food and make a sloshy solution
 * not enough to make the chunks go away
 * protein can be digested in stomach
 * small intestine
 * where the chemical digestion occurs
 * absorption occurs in small intestine
 * small intestine has the surface of a tennis court
 * Large intestine
 * food you don't want is left in the large intestine
 * there are friendly bacteria eat the stuff
 * water is absorbed
 * diarrhea can kill small children