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(a) W - Spinal column/ vertebral column/ cervical vertebrae
Y - Sternum
Z - Intercostal muscles.
b)The external intercoastal muscles contract while the internal intercostal muscles relax. This movement pulls the ribs upwards and outwards. The diaphragm muscles contracts hence flattens. the thoracic volume increases while the pressure reduces, leading to atmospheric air rushing into the lungs through the nose and trachea hence inflating the lungs
johnmulu answered the question on May 3, 2017 at 13:18
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The diagram below shows gaseous exchange tissues
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(ii) From the body cells
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Date posted: May 3, 2017. Answers (1)
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Date posted: May 3, 2017. Answers (1)
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Date posted: May 3, 2017. Answers (1)
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Date posted: May 3, 2017. Answers (1)
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b) Name the muscles found in the following organs (i) Stomach ...(ii) Bone ...(Solved)
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Date posted: May 3, 2017. Answers (1)
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a) Name the part labeled P and Q.
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Date posted: May 3, 2017. Answers (1)
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Date posted: May 3, 2017. Answers (1)
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b) Name an organism which has single circulatory system
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Date posted: May 3, 2017. Answers (1)
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Date posted: May 3, 2017. Answers (1)