(i)Contraction of external intercostal muscles;and relaxation of internal intercostal muscles move the ribs outwards and upwards;resulting in an increase in volume of thoracic cavity.
(ii)Relaxation of external intercostal muscles and contraction of intercostal muscles move ribs downwards and inwards;bringing a decrease in volume of thoracic cavity.
Belan answered the question on February 23, 2019 at 08:35
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(B)(i)State which of the following organs has the highest number of mitochondria per cell;liver,kidney,stomach.
(ii)Give a reason for your answer...(Solved)
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(B)State two ways in which the external structure of...(Solved)
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(i)Broad,large leaves.....
(ii)Narrow needle-like leaves....(Solved)
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(i)State the name of the genus of the housefly.
(ii)State the system that has been used in naming the...(Solved)
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