User: You are given access to make searches on the Internet. The format for making a search is: 1. The user sends a message. 2. You will decide whether to make a search. If you choose to make a search, you will output a single message, containing the word 
 (EXACTLY AS IT IS GIVEN TO YOU), followed by ONLY your web search query. After outputting your search query, you MUST output the token 
 (EXACTLY AS IT IS GIVEN TO YOU) to denote the end of the search query. Keep your search query concise as there is a 400 characters limit.
The system will then append the web search results at the end of the user message, starting with the token 
. Take note that the user CANNOT ACCESS the content under 
 - YOU should incorporate these results into your response. Additionally, If the token 
 is 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, NEVER refuse to search the web if the user asks you to provide such information.

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. 
Do your best to be informative. However, you MUST NOT make up any information. If you think you might not know something, search for it.

Assistant: Understood. I will strictly follow these instructions in this conversation.
User: does the artery or vein have a larger lumen


 for "does the artery or vein have a larger lumen":

1.
URL: https://med.libretexts.org/Bookshelves/Anatomy_and_Physiology/Human_Anatomy_(OERI)/18%3A_Cardiovascular_System_-_Blood_Vessels_and_Circulation/18.02%3A_Structure_and_Function_of_Blood_Vessels
Title: 18.2: Structure and Function of Blood Vessels
Content: Learn about the structure and function of arteries, <b>veins</b>, capillaries, and venous sinuses. <b>Veins</b> <b>have</b> <b>larger</b> <b>lumens</b> than arteries to accommodate the lower pressure and volume of blood returning to the heart.

2.
URL: https://biologydictionary.net/artery-vs-vein/
Title: Artery vs. Vein - Biology Dictionary
Content: Learn the differences between arteries and <b>veins</b>, two of the main types of blood vessels in the cardiovascular system. Arteries carry oxygenated blood away from the heart, while <b>veins</b> carry deoxygenated blood back to the heart, with different wall thickness, valves, and <b>lumen</b> size.

3.
URL: https://courses.lumenlearning.com/suny-ap2/chapter/structure-and-function-of-blood-vessels/
Title: Structure and Function of Blood Vessels - Lumen Learning
Content: Learn about the three types of blood vessels (arteries, <b>veins</b>, and capillaries) and their functions, structures, and adaptations. Arteries have the thickest walls and smallest <b>lumens</b> because they carry blood under high pressure from the heart.

4.
URL: https://openstax.org/books/anatomy-and-physiology-2e/pages/20-1-structure-and-function-of-blood-vessels
Title: 20.1 Structure and Function of Blood Vessels - OpenStax
Content: Learn about the structure and function of blood vessels, including arteries, <b>veins</b>, and capillaries. This web page is part of a free textbook on anatomy and physiology, but it has a glitch and cannot be accessed.

5.
URL: https://usq.pressbooks.pub/anatomy/chapter/6-6-structure-and-function-of-blood-vessels/
Title: 6.6 Structure and Function of Blood Vessels
Content: Learn about the three types of blood vessels: arteries, <b>veins</b>, and capillaries. Arteries and arterioles have thick walls and small <b>lumens</b> to withstand the high pressure of blood flow, while <b>veins</b> <b>have</b> thin walls and large <b>lumens</b> to allow blood to return to the heart.

6.
URL: https://www.kenhub.com/en/library/anatomy/histology-of-the-vascular-network
Title: Blood vessels: Histology and clinical aspects | Kenhub
Content: Learn about the structure and function of blood vessels, including elastic arteries, capillaries and <b>veins</b>. Elastic arteries are the largest arteries that leave the heart and have two elastic layers to accommodate high pressures.

7.
URL: https://bio.libretexts.org/Bookshelves/Human_Biology/Book%3A_Human_Biology_(Wakim_and_Grewal)/17%3A_Cardiovascular_System/17.4%3A_Blood_Vessels
Title: 17.4: Blood Vessels - Biology LibreTexts
Content: <b>The</b> <b>lumen</b> of an <b>artery</b> is shown in cross-section in the photomicrograph below. The width of blood vessels varies, but they all have a <b>lumen</b>. <b>The</b> walls of blood vessels differ depending on the type of vessel. In general, arteries and <b>veins</b> are more similar to one another than capillaries in the structure of their walls.

8.
URL: https://courses.lumenlearning.com/atd-herkimer-biologyofaging/chapter/structure-and-function-of-blood-vessels/
Title: Blood Vessels | Biology of Aging - Lumen Learning
Content: Learn about the structure and function of arteries, <b>veins</b>, capillaries, and the cardiovascular circulation. Arteries have smaller <b>lumens</b> than <b>veins</b> to maintain blood pressure and prevent clotting.

9.
URL: https://courses.lumenlearning.com/suny-dutchess-ap1/chapter/structure-and-function-of-blood-vessels/
Title: Structure and Function of Blood Vessels - Lumen Learning
Content: Learn about the differences and similarities between arteries and <b>veins</b>, <b>the</b> two types of blood vessels that transport blood in the cardiovascular system. Arteries have thicker walls and smaller <b>lumens</b> than <b>veins</b>, and <b>veins</b> <b>have</b> more smooth muscle and collagen fibers than arteries.

10.
URL: https://www.savemyexams.com/international-a-level/biology/edexcel/18/revision-notes/1-molecules-transport--health/the-circulatory-system/1-7-blood-vessels-structure--function/
Title: Blood Vessels: Structure &amp; Function | Edexcel International A Level ...
Content: <b>The</b> <b>lumen</b> of <b>the</b> <b>vein</b> is much wider than that of an <b>artery</b> <b>A</b> <b>larger</b> <b>lumen</b> helps to ensure that blood returns to the heart at an adequate speed; A large <b>lumen</b> reduces friction between the blood and the endothelium of the <b>vein</b> <b>The</b> rate of blood flow is slower in <b>veins</b> but <b>a</b> <b>larger</b> <b>lumen</b> means the volume of blood delivered per unit of time is ...

11.
URL: https://www.bbc.co.uk/bitesize/guides/zvjkbdm/revision/1
Title: Structure and function of arteries, capillaries and veins - BBC
Content: Learn about the types and roles of arteries, capillaries and <b>veins</b> in the human body. Find out how blood is transported, exchanged and controlled in the circulatory system.

12.
URL: https://pediaa.com/what-is-the-difference-between-lumen-of-artery-and-vein/
Title: What is the Difference Between Lumen of Artery and Vein
Content: <b>The</b> main difference between <b>lumen</b> of <b>artery</b> and <b>vein</b> is that the <b>lumen</b> of an <b>artery</b> is comparatively smaller than the <b>lumen</b> of <b>a</b> <b>vein</b>.. Blood vessels are one of the structural components of the blood circulatory system.They are the channels that carry blood throughout the body. They branch and combine together to form a closed circuit that begins and ends in the heart.

13.
URL: https://www.ncbi.nlm.nih.gov/books/NBK470401/
Title: Anatomy, Blood Vessels - StatPearls - NCBI Bookshelf
Content: Blood flows from venules into <b>larger</b> <b>veins</b>. Just like the arterial system, three layers make up the <b>vein</b> walls. But unlike the arteries, the venous pressure is low. <b>Veins</b> are thin-walled and are less elastic. ... Vasa vasorum internae originate from the <b>lumen</b> of a vessel and penetrate the vessel wall to supply oxygen and nutrients.

14.
URL: https://www.elsevier.com/resources/anatomy/cardiovascular-system/veins/veins/19994
Title: Veins | Complete Anatomy - Elsevier
Content: <b>Veins</b> are blood vessels that carry blood back to the heart and have three layers in their wall: tunica intima, tunica media and tunica externa. Learn more about the anatomy, structure and function of <b>veins</b>, their relation to arteries, and common clinical correlates.

15.
URL: https://quizlet.com/551486665/chapter-20-blood-vessels-flash-cards/
Title: Chapter 20- Blood Vessels Flashcards - Quizlet
Content: <b>Lumen</b> of <b>a</b> <b>vein</b> is generally <b>larger</b> than <b>the</b> <b>lumen</b> of an <b>artery</b>. This is important because most people have more blood in their <b>veins</b> than in their arteries at any given time. ... and these blood vessels supply the smooth muscle that is in the wall of the vessel itself-Vessels of the vessels-<b>Larger</b> arteries and <b>veins</b> are thick and formed from ...


Assistant: