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Cancer usually begins in the bronchi or bronchioles. Components of cigarette smoke contribute to the devel¬opment of cancerous tumours. Study the four diagrams below, which show the development and progression of lung cancer. Listen to the video about the effects of smoking in our lungs using the link below. https://www.youtube.com/watch?v=69R0E_Rg_mQ

Cancer usually begins in the bronchi or bronchioles. Components of cigarette smoke contribute to the devel¬opment of cancerous tumours. Study the four diagrams below, which show the development and progression of lung cancer. Listen to the video about the effects of smoking in our lungs using the link below. https://www.youtube.com/watch?v=69R0E_Rg_mQ

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Cancer usually begins in the bronchi or bronchioles. Components of cigarette smoke contribute to the devel¬opment of cancerous tumours. Study the four diagrams below, which show the development and progression of lung cancer. Listen to the video about the effects of smoking in our lungs using the link below. https://www.youtube.com/watch?v=69R0E_Rg_mQ
5 While the cancerous tumour is still walled in by the basal membrane in diagram C, the tumour breaks through the membrane in diagram D. At this stage, the tumour may spread to other parts of the body. Cancer cells often use lymph vessels as pathways to other parts of the body, where they continue to divide. e) Why does this characteristic make cancer especially dangerous? Case-Study Application Questions. 1 Based on the information that you gained in the case study, explain why smokers are often plagued by a cough. 2 Why is the slowing of the cilia lining the bronchi especially dangerous? 3 Survey different smokers and find out how many cigarettes they smoke in one day. Most cigarettes contain about 15 mg of tar, but it should be noted that only 75% of the tar is absorbed. Calculate the amount of tar taken in each day. Show your calculations. 4. Nicotine, one of the components of cigarettes, slows cilia" lining the respiratory tract, causes blood vessels to constrict, and increases heart rate. Another component of cigarette smoke is carbon monoxide. As you have read, carbon monoxide competes with oxygen for binding sites on the hemoglobin molecule found in red blood cells. Analyse the data presented, and describe the potential dangers associated with smoking. 100 ]' ( C &
Transcribed Image Text:5 While the cancerous tumour is still walled in by the basal membrane in diagram C, the tumour breaks through the membrane in diagram D. At this stage, the tumour may spread to other parts of the body. Cancer cells often use lymph vessels as pathways to other parts of the body, where they continue to divide. e) Why does this characteristic make cancer especially dangerous? Case-Study Application Questions. 1 Based on the information that you gained in the case study, explain why smokers are often plagued by a cough. 2 Why is the slowing of the cilia lining the bronchi especially dangerous? 3 Survey different smokers and find out how many cigarettes they smoke in one day. Most cigarettes contain about 15 mg of tar, but it should be noted that only 75% of the tar is absorbed. Calculate the amount of tar taken in each day. Show your calculations. 4. Nicotine, one of the components of cigarettes, slows cilia" lining the respiratory tract, causes blood vessels to constrict, and increases heart rate. Another component of cigarette smoke is carbon monoxide. As you have read, carbon monoxide competes with oxygen for binding sites on the hemoglobin molecule found in red blood cells. Analyse the data presented, and describe the potential dangers associated with smoking. 100 ]' ( C &
cancer cens mucus (a) normal (b) cancer develops tumour narrow bronchioles (c) cancer advances (d) tumour spreads 1. Cigarette smoke travels through the bronchi and irritates the cells. Goblet cells produce mucus, which is designed to trap foreign particles. Compare the mucous layers in diagrams A and B. a) How has cigarette smoke affect the mucous layer? 2 Ciliated cells line the bronchi. Cilia sweep away the debris trapped by the mucus. Unfortunately, the tar found in cigarette smoke slows the action of the cilía. The sludge-like tar becomes trapped in the mucus. b) Why does the build-up of tar in the bronchi limit air flow? 3 Diagram B shows the beginning of a cancerous tumour. c) In what area does the tumour begin to develop? 4 Diagram C shows how the tumour begins to grow. d) Why has the mucous layer in diagram C decreased in size? cilia basal goblet cells cells thin mucous layer
Transcribed Image Text:cancer cens mucus (a) normal (b) cancer develops tumour narrow bronchioles (c) cancer advances (d) tumour spreads 1. Cigarette smoke travels through the bronchi and irritates the cells. Goblet cells produce mucus, which is designed to trap foreign particles. Compare the mucous layers in diagrams A and B. a) How has cigarette smoke affect the mucous layer? 2 Ciliated cells line the bronchi. Cilia sweep away the debris trapped by the mucus. Unfortunately, the tar found in cigarette smoke slows the action of the cilía. The sludge-like tar becomes trapped in the mucus. b) Why does the build-up of tar in the bronchi limit air flow? 3 Diagram B shows the beginning of a cancerous tumour. c) In what area does the tumour begin to develop? 4 Diagram C shows how the tumour begins to grow. d) Why has the mucous layer in diagram C decreased in size? cilia basal goblet cells cells thin mucous layer
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