can someone please tell me how sugars, amino acids and lipids enter the systemic blood circulation?

Answer 1

First, they must be digested. Starch, sucrose, and lactose must be digested into glucose, galactose, and fructose. Then they enter the blood circulation through the mouth, stomach, and intestinal tract.

Amino acids enter the blood system at once. But they are components of proteins. So the proteins must be digested first. Then the component amino acids are absorbed.

Lipids are fats, oils, and cholesterol. Fats and oils are esters of glycerol with long-chain fatty acids like stearic, CH3(CH2)16COOH. The triglycerides, as they are called, must be digested to the fatty acids and glycerol. Then those can be absorbed.

Cholesterol is absorbed directly. That's a problem. Humans with a tendency to heart disease absorb too much cholesterol. The cholesterol blocks coronary arteries.

Answer 2

This isn't a very good argument. I came across an article from the early 1960's where a Dr. Carl Sagan claims that 'very soon', we will have created self-replicating molecules in a lab. Well, it's been over 50 years and still no self-replicating molecules. The organic molecules are very, very important, but there needs to be a lot more research before we can say for sure that life started this way. The fact that 50 years have passed since Carl Sagan's statement could be used by creationists as ammunition against abiogenesis. I sometimes wonder what they would do if creationists read the same books that I do. Of course, that would never happen.

Answer 3

sugars or glucose are particles that form starch... they start to break up in the mouth with the enzyme amylase.... amylase breaks starch into maltose (two glucose).........ok so amino acids where once proteins which were broken down by the protease pepsin in the stomach..... then all the food.... lipids maltose and amino acids enter the ileum...(the first part of the small intestine) this has a large surface area increased by the vili which absorb the food into the blood system