transport in humans paper 2
TRANSCRIPT
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8/3/2019 Transport in Humans Paper 2
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BEACONHOUSE SCHOOL SYSTEM (JOHAR TOWN CAMPUS BOYS BRANCH) 1
Beaconhouse School SystemJohar Town Campus
Boys Branch
Topic:Transport in Humans Marks Assessment
Question no 1Fig. 1.1 shows a section through the human heart. The structure labelled E is the pacemaker ofthe heart.
1 (a) (i) Use label lines and letters to identify the aorta, vena cava, pulmonary vein and rightventricle on Fig. 1.1.
A aortaP pulmonary veinR right ventricleV vena cava [4]
(ii) What type of tissue is found at D?
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(iii) Explain the importance of the pacemaker to the functioning of the heart.
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Name: _____________________ Date: _________________
20
GRADE: Percentage:
Fig. 1.1
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BEACONHOUSE SCHOOL SYSTEM (JOHAR TOWN CAMPUS BOYS BRANCH) 2
(iv) Name the part of the heart labelled C and state its function.
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(v) Name structure B.
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(vi) Where else in the body are structures of this type found?
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Fig. 1.2 shows a surface view of the heart of someone who has just suffered a heart attack.
(b) (i) State what is blocking the coronary artery.
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(ii) Explain why some of the tissue has died.
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(iii) Explain how the death of this tissue would affect the functioning of the heart.
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Fig. 1.2
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BEACONHOUSE SCHOOL SYSTEM (JOHAR TOWN CAMPUS BOYS BRANCH) 3
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(c) There are many factors that are known to increase the likelihood of having a heart attack.These factors are known as risk factors.Name fourrisk factors that can contribute towards a heart attack.
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4. ................................................................................................................................................... [4]
[Total: 20]
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BEACONHOUSE SCHOOL SYSTEM (JOHAR TOWN CAMPUS BOYS BRANCH) 4
Topic: Transport System in HumansMARK SCHEME
Question no 1:
1 (a) (i) correctly labelledA aorta ;P pulmonary vein ;R right ventricle ;V vena cava ; [ [4](label line to end on wall or lumen, reject if left ventricle labelled)
(ii) muscle / cardiac muscle; [1]
(iii) sends electrical impulses through the heart wall;which makes the heart /muscle contract regularly; [2](stimulates (heart) muscle to contract = 1 mark)
(iv) atrio-ventricular / mitral /bicuspid valve;prevents backflow of blood / prevents blood flowing into atrium; [2](accept left or right a-v valve)
(v) aortic valve / semilunar valve / pocket valve; [1]
(vi) in the veins; [1](accept in the lymphatic vessels, ignore at the base of pulmonary artery)
(b) (i) blood clot / thrombus; [1](accept plug of cholesterol / fat)
(ii) heart muscle cells deprived of blood / oxygen / glucose;cells die as they lack of energy; AW [2]
(iii) reduced contraction of (left) ventricle;pumping action of the heart less efficient / ceases; [2]
(c) inherited disposition;AW (high) blood pressure;(high) levels of stress;lack of exercise;high level of animal / saturated fats in the diet;high levels of blood cholesterol;smoking; [max 4]
[Total: 20]