User: 

You are given access to make searches on the Internet. The format for making a search is:
1. After the user sends a message, you will decide whether to make a search. If you choose to make a search, you will output a single message, starting with the word <web_search>, followed by ONLY your web search query. After your search query, you must output the token </web_search> to denote the end of the search query. Keep your search query very concise.
2. The system will then append the web search results at the end of the user message, starting with the token <web_search_results>. Take note that the user CANNOT SEE the content after <web_search_results> - YOU should use these results appropriately to improve your response. Additionally, If the web search results are already present in the user's message, then you MUST NOT request another web search.

IMPORTANT! You should choose to search the web ONLY if ANY of the following circumstances are met:
1. User is asking about current events or something that requires real-time information (news, sports scores, 'latest' information, etc.)
2. User is asking about some term you are unfamiliar with (e.g. if it's a little-known term, if it's a person you don't know well, etc.)
3. User is asking about anything that involves numerical facts (e.g. distances between places, population count, sizes, date and time, etc.)
4. User explicitly asks you to search or provide links to references.
If the user's query does NOT require a web search, YOU MUST NEVER run one for no reason. However, you must not refuse to search the web if the user asks you to do so.
If you are highly unsure about whether to make a search (e.g. if the user's query is vague or if you think you are unfamiliar with the query to a certain extent), you may directly ask the user for clarification.

When using web search results, you are encouraged to cite references where appropriate, using inline links in standard markdown format.
You are also allowed to make use of web search results from previous messages, if they are STRONGLY RELEVANT to the current message.

When you are not running a web search, respond completely as per normal - there is NO NEED to mention that you're not searching. 
Remember that you MUST NOT make up any false information.
Assistant: Understood. I will strictly follow these instructions in this conversation.
User: Is the deuodenum coverd in villi?
Assistant: Yes, the duodenum, which is the first part of the small intestine, is covered in villi. These tiny, finger-like projections increase the surface area for absorption of nutrients. The villi are also lined with epithelial cells, which have microvilli that further enhance the absorptive capacity of the duodenum.
User: So I should add small finger like figures in my diagram of the deuodenum?
Assistant: Yes, you should definitely add small finger-like figures to your diagram of the duodenum. These figures represent the villi, which play a crucial role in increasing the surface area for nutrient absorption. Including them will help illustrate the structure and function of the duodenum more accurately.
User: does the jujunum and ileum have the same amount or more villi compared to the duodenum?
Assistant: The jejunum and ileum have more villi compared to the duodenum. While all three parts of the small intestine—duodenum, jejunum, and ileum—are lined with villi to facilitate absorption, the jejunum has the highest density of villi, which decreases slightly in the ileum. This is because the jejunum is primarily responsible for nutrient absorption, while the ileum plays a role in the absorption of certain vitamins and bile salts. Thus, when comparing the three, the jejunum and ileum collectively have a greater amount of villi than the duodenum.
User: Do the micro villi on villi help increase surface area which in turn increases the rate of diffusion which in turn increases the small intestines ability to absorb nutrients?
Assistant: Yes, that's correct! The microvilli, which are tiny projections on the epithelial cells that line the villi, significantly increase the surface area of the intestinal lining. This enlarged surface area enhances the rate of diffusion and facilitates the absorption of nutrients. As a result, the small intestine is highly efficient in absorbing nutrients from digested food. The combination of villi and microvilli creates a brush border that maximizes the absorptive capacity of the small intestine, making it an essential feature for nutritional uptake.
User: what is vascularization?
Assistant: