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131282 Question Paper Unit f214 Communication Homeostasis and Energy

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  Friday 22 June 2012 – Morning A2 GCE BIOLOGY F214 Communication, Homeostasis and Energy INSTRUCTIONS TO CANDIDATES ã Write your name, centre number and candidate number in the boxes above. Please write clearly and in capital letters.ã Use black ink. HB pencil may be used for graphs and diagrams only.ã Answer all  the questions.ã Read each question carefully. Make sure you know what you have to do before starting your answer.ã Write your answer to each question in the space provided. If additional space is required, you should use the lined pages at the end of this booklet. The question number(s) must be clearly shown.ã Do not  write in the bar codes. INFORMATION FOR CANDIDATES ã The number of marks is given in brackets [ ]  at the end of each question or part question.ã The total number of marks for this paper is 60 .ã Where you see this icon you will be awarded marks for the quality of written communication in your answer.ã You may use an electronic calculator.ã You are advised to show all the steps in any calculations.ã This document consists of 16  pages. Any blank pages are indicated. * F 2 1 4 * OCR is an exempt Charity Turn over  © OCR 2012 [A/500/8553]DC (SM/SW) 46182/3 Candidates answer on the Question Paper. OCR supplied materials: None Other materials required: ã Electronic calculatorã Ruler (cm/mm) *F21 04 0 0 611* Duration: 1 hour 15 minutes  2  © OCR 2012 Answer all  the questions. 1 (a) The cells of the body need to communicate with one another.   State the name given to this process of communication. .............................................................................................................................................. [1] (b) Fig. 1.1 is an electron micrograph of the junction between two neurones. Fig. 1.1 (i) State the name given to the gap between the two neurones at this junction. ...................................................................................................................................... [1] (ii) Outline how the first neurone communicates with the second neurone across the gap.   In your answer, you should use appropriate technical terms, spelt correctly.  ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [3]  first neuronesecond neuronegap between thetwo neurones  3 Turn over  © OCR 2012  (iii) Outline the importance of the junctions between neurones in the functioning of the nervous system. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [3]  The nervous system and the hormonal system are involved in the maintenance of core body temperature.  (c) Give the most suitable  word or term that has the same meaning as each of the following descriptions:  (i) animals that are able to regulate and maintain their core body temperature within narrow limits; ...................................................................................................................................... [1] (ii) the increase in the diameter of the lumen of an arteriole to allow more blood to flow through. ...................................................................................................................................... [1] (d) (i) Name a hormone that increases the metabolic rate and so generates heat. ...................................................................................................................................... [1] (ii) Name the part of the brain where the thermoregulatory centre is located. ...................................................................................................................................... [1] [Total: 12]  4  © OCR 2012 2 The kidney is composed of many nephrons. Fig. 2.1 is a diagrammatic representation of a nephron. The numbers represent the relative concentrations of solutes in the tubule and the tissue fluid surrounding the tubule.3 23346 collectingduct 9 3 124746 9 12loop of Henle346 9 12 12distalconvolutedtubuleafferentarteriole LMN efferentarterioleincreasingsoluteconcentration Fig. 2.1 (a) Name  the parts of the nephron labelled L , M  and N . L  ................................................................................................................................................ M  ............................................................................................................................................... N  .......................................................................................................................................... [3]

JUNE 2010

Jul 23, 2017
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