Biology 9700/23 — May/June 2022
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Cell Structure · Cell Membranes and Transport · Transport in Mammals · The Mitotic Cell Cycle · Nucleic Acids and Protein Synthesis · Gas Exchange · +5 more
The trachea of the gas exchange system branches into two airways, each of which enters a lung.
Name the airways that branch from the trachea to enter the lungs.
The lower part of the trachea receives blood from arteries that branch from the aorta. Different arteries carry blood from the heart to the alveoli of the lungs.
State the differences between the arteries supplying the lower part of the trachea and the arteries that supply blood to the alveoli of the lungs.
Fig. 1.1 is a photomicrograph of a section through part of the trachea.
In Fig. 1.1, one of the tissues in the trachea is labelled T.
Describe the structural features of tissue T visible in Fig. 1.1.
Identify structure X in Fig. 1.1 and outline the features that helped your identification.
structure X = ______
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