O-LevelBiologyTransport in Humans5090/21 · May/June 2017 · Q311 Marks

Fig. 3.1 shows an organ, X, and its associated blood vessels P, Q and R. Organ X is involved in the following processes: • the metabolism of amino acids, • the breakdown of chemical substances, including alcohol. [Figure 3.1]

(a)Name organ X and each of its associated blood vessels. organ X blood vessel P blood vessel Q blood vessel R[4]
(b)Compare the structure of the blood vessels P and R in Fig. 3.1.[3]
(c)(i)Oestrogen is an example of a type of chemical substance, produced by a gland, that alters the activity of one or more specific target organs before being destroyed by organ X. Name this type of chemical substance.[1]
(c)(ii)With reference to oestrogen, complete Table 3.1. Table 3.1 gland where produced target organ effect on target organ[3]

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Mark scheme

Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.

[4] 3(a) (X) liver; (P) hepatic vein ; (Q) hepatic portal vein ; (R) hepatic artery ;
[3] 3(b) (P / vein has) wide(r) + lumen AW ; thin(ner) wall; less AW + muscle / elastic (tissue); valves;
[1] 3(c)(i) hormone;
[3] 3(c)(ii) ovary; uterus; repairs / thickens (uterus) lining ;

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