(a)[1]
State the meaning of a single circulation.
(b)[1]
State the letter of the blood vessel in Fig. 4.1 in which the blood pressure is greatest.
(c)[2]
State two features that gas exchange surfaces have.
Biology 0610 · IGCSE · Circulatory systems
Circulatory systems — practice question
Fig. 4.1 illustrates a section of a fish's circulatory system. The arrows indicate the direction in which the blood moves.