Cambridge AssessmentCANDIDATENAMECENTRECANDIDATENUMBERNUMBERBIOLOGY0610/42Paper 4 Theory(Extended)February/March 20231 hour 15 minutesYou must answer on the question paper.No additional materials are needed.INSTRUCTIONSAnswer all questions.Use a black or dark blue pen.You may use an HB pencil for any diagrams or graphs.Write your name,centre number and candidate number in the boxes at the top of the page.Write your answer to each question in the space provided.Do not use an erasable pen or correction fluid.Do not write on any bar codes.You may use a calculator.You should show all your working and use appropriate units.INFORMATION.The total mark for this paper is 80.The number of marks for each question or part question is shown in brackets ]This document has 20 pages.Any blank pages are indicated.DC(EFJG)311941/4©UCLES2023[Turn over21 (a)Fig.1.1 is a simplified diagram of the circulatory system in humans.Bother organsFig.1.1State the letter from Fig.1.1 that represents the blood vessel that contains blood with thehighest concentration of oxygen.(ii)State the letter from Fig.1.1 that represents the hepatic portal vein.(iii)State all the letters from Fig.1.1 that represent arteries.©UCLES20230610/42/FM233(iv)Explain the importance of the part labelled Y in Fig.1.1.(v)State the evidence from Fig.1.1 that the diagram shows a double circulation system.©UCLES20230610/42/FM23