1. Materia: Biology Senior 3
Profesora: Ma. Magdalena Ravagnan
Contenido nodal: Nutrition and transport in humans
SEGUNDO TRIMESTRE
Fecha de presentación: Tuesday February 19th
A- Human nutrition
1) (a) Fibre in the human diet contains a lot of cellulose that humans cannot digest.
(i) State two advantages to humans of including fibre in the diet.
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(b) Micronutrients are components of the diet that are only needed in very small quantities.
Name two micronutrients that are essential for the healthy development of bones and teeth.
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2 ………………………………………………..[2]
2) Complete the following table:

2. 3) Fig. 3.1 shows a section through a villus in the small intestine. The blood capillaries are not shown.
(a) (i) On Fig. 3.1, draw a capillary inside the villus and link it with the appropriate blood vessels. Draw an arrow to show
the direction of blood flow in the capillary.
(ii) Name the first organ to which blood flows from the small intestine.
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(b) The cells of the surface layer of the villus are involved in absorption.
State two features of these cells that improve absorption.
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(c) (i) Name structure Y. .................................................................................................

3. 4) Fig. 8.1 shows a diagram of a section through the heart.
(a) On Fig. 8.1:
(i) label an atrium; [1]
(ii) label the pulmonary vein; [1]
(iii) shade in the chambers that contain deoxygenated blood. [1]
(b) Name the blood vessel that delivers blood to the muscles of the heart.
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(c) State two preventive actions a person could take to reduce the chance of a heart
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