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Biology · Oct / Nov 2021 · Paper 41 · Question 5

0610

As printed in the paper

The question as text

The circulatory system is comprised of the heart, blood vessels and the blood.

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Show the answer and mark scheme

  • 5(a)[4]

    any four from:

    valves in, heart / (main) veins ;

    correct sequence, of open / closing, of valves ;

    prevention of backflow / description ;

    semi-lunar valves ;

    atrioventricular valves ;

    heart, pumping / contracting ;

    AVP ;

  • 5(b)[6]

    one mark per row:

    type of

    letter on function

    blood vessel

    Fig. 5.1 regulates blood flow by

    arteriole

    P

    constricting and dilating

    / artery

    N collects blood from a network

    venule

    K of the narrowest blood vessels

    withstands the highest blood

    artery

    N pressure

    allows the transfer of

    substances to and from tissue

    capillary

    J fluid

    transports blood towards the

    vein

    M heart

    / venule

    K redirects blood under the

    shunt vessel

    L surface of the skin

  • 5(c)[2]

    renal artery ;

    coronary artery ;

  • 5(d)[4]

    any four from:

    stent ;

    (small) mesh / gauze, tube inserted in artery ;

    opens / supports, (narrow / weak) artery ;

    (balloon) angioplasty / dilatation ;

    (tube / catheter with) balloon inserted into artery ;

    inflate balloon to widen artery ;

    by-pass ;

    (another / shunt) blood vessel, joined to / grafted to / replaces, artery ;

    AVP ; e.g. aspirin / warfarin / ref to treatment of clots

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