47 Which system is involved in the following circumstances? a) a broken radius b) blood extraction c) pneumonia d) deafness e) muscle contraction 48 Identify the life process in each case: a) Formation of a new person. b) Detection of light through the photoreceptive cells in the eye. c) Elimination of toxic substances through the urine. d) Transport of nutrients from the digestive system to the tissues. e) Detecting a noise. 49 Can a human being be considered a simple grouping of cells? Explain. 50 Write a short text using these terms: human being, multicellular, eukaryotic cell, cellular differentiation, tissues, organs and life processes. 46 This is a photo of skin seen through a microscope. Look for information and answer the questions. a) How many types of tissue make up the skin? b) Which glands are there in the skin? Which type are they? What do they secrete? c) What function do the nerve endings in the skin have? d) The cells of the epidermis are very close together. How does this help the body? e) Which function do you think the blood vessels in the dermis perform? Plan a museum exhibition on the human body Prepare the different areas of your exhibition. – Place signs along the route to ensure the order of the visit goes from the smallest level of organisation to the largest. – Make sure there is enough space to see everything clearly. – Post clear information about each element in the exhibition. Arrange with your school a date and time for the exhibition. Come up with an attractive title and make invitations with the relevant information. Give them to your family and friends. If your school agrees, you can ask for a symbolic entrance fee. With the money you collect, you can make a donation to a cancer research society, buy toys for children in hospital, or support any other cause you feel can improve the lives of the people around you. 1 W E L L D O N E ! Epidermis Dermis CHALLENGE 33
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