CAIE A-Level Biology AS 8.1.4 Blood Vessel Recognition Questions

Identify blood vessels from structural features and functions using evidence from each question and mark scheme.

Exam points

Identify and distinguish blood vessels from their structural features and functions.

[Maximum number: 2]

Smooth muscle is a tissue composed of smooth muscle cells. The cells contain cytoplasm packed with proteins that are involved in contraction and relaxation.

Fig. 1.2 is a photomicrograph of smooth muscle tissue in the wall of the intestines. A capillary is visible in addition to smooth muscle cells.

Fig. 1.2

Outline the features that help to identify the blood vessel in Fig. 1.2 as a capillary.

any two from:

wall, of one layer/is one cell thick ;

I capillary is one cell thick

A thin wall / endothelial cells are a single layer

A endothelium is, a single layer (of cells) / one cell thick

idea that red blood cells transported in single file ;

idea that red blood cells diameter (approximately), as large / same, as capillary (lumen) ;

A if diameter (e.g. $7 \mu \mathrm{~m}$ ) stated as being similar to capillary size

idea of diameter of capillary narrower than smooth muscle cell ;

AVP ;
e.g. no muscle and elastic layer

muscle fibres / elastic fibres / collagen, not present ref. to different shapes of red blood cell / red blood cell showing flexibility, to pass through (narrow) capillary

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CAIE A-Level Biology AS 8.1.4 Blood Vessel Recognition Questions question 1