Biology 9700/23 — May/June 2017
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Nucleic Acids and Protein Synthesis · Biological Molecules · Transport in Mammals · Cell Structure · Enzymes · Infectious Diseases · +4 more
Mammals have a closed double circulation system.
Explain what is meant by a closed double circulation.
Table 1.1 shows some structures in the mammalian circulatory system.
Complete Table 1.1 to show the sequence of structures through which blood flows, starting with the pulmonary vein.
Use the numbers 2 to 5 to indicate the correct sequence.
Table 1.1
| structure | sequence of blood flow |
|---|---|
| left ventricle | |
| vena cava | |
| pulmonary vein | 1 |
| aorta | |
| right atrium |
Explain why arteries have thicker walls than veins.
Smoking causes carbon monoxide and nicotine to enter the blood.
Describe the short-term effects of each of these substances on the cardiovascular system.
carbon monoxide
nicotine
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