11. Transport in humans
A section of Biology, 5090
Listing 10 of 276 questions
shows a vertical section through a human heart viewed from the front. Two chambers, X and Y, are labelled. X Y Use , and your knowledge of the circulatory system, to complete Table 2.1. Table 2.1 chamber name of chamber name of blood vessel carrying blood from chamber X Y shows how the mean blood pressure changes as blood flows through different types of blood vessel after leaving the heart. mean blood pressure / arbitrary units arteries capillaries type of blood vessel veins diameter of blood vessel / arbitrary units arteries capillaries type of blood vessel veins Draw a line on to show how the diameters of the vessels that blood flows through vary. Use the line you have drawn on , and your biological knowledge, to explain why the mean blood pressure is higher in an artery than in a vein. shows blood returning to the heart at low pressure through a vein in a leg. direction of blood flow back to heart D E Name part D in . Explain how this part enables blood to return to the heart. name of part D function Suggest how the parts labelled E in help blood to return to the heart.
5090_w15_qp_21
THEORY
2015
Paper 2, Variant 1
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shows a section through a heart connected to what is described as an LV Assist Device. tube N tube M LV Assist Device wire to power source Use to suggest why the device is called an LV Assist Device. Name the type of tissue through which tube M passes. Name the blood vessel into which tube N is inserted. Draw arrows on to show the direction of blood flow in the blood vessels that carry blood into the heart. the direction of blood flow through the LV Assist Device. Name the valve that is bypassed by blood flowing through the LV Assist Device. Sometimes the pulmonary circulation requires artificial assistance. Suggest and describe where, under these circumstances, an Assist Device would be fitted.
5090_w16_qp_22
THEORY
2016
Paper 2, Variant 2
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Fig. 1 and Fig. 2 show transverse sections of two types of blood vessel. Fig. 1 Fig. 2 Name the type of blood vessel shown in: Fig. 1 Fig. 2 Describe the differences in the structures shown in Fig. 1 and Fig. 2 that helped you to identify these blood vessels. The diagram below is of a simplified, incomplete longitudinal section from the type of blood vessel shown in Fig. 2. The direction of blood flow is shown. direction of blood flow Complete the diagram by drawing one set of valves. Describe the function of these valves.
5090_w18_qp_22
THEORY
2018
Paper 2, Variant 2
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Questions Discovered
276