11The life span of a human red blood cell is about:A120 daysB1 yearC30 daysD10 daysView AnswerDiscussWorkspaceReportSaveMedium
12Exchange of gases in the lungs takes place in the:ATracheaBAlveoliCBronchiDLarynxView AnswerDiscussWorkspaceReportSaveEasy
13Which organ purifies the blood by removing urea?AHeartBLungsCKidneyDLiverView AnswerDiscussWorkspaceReportSaveEasy
14The pigment that carries oxygen in red blood cells is:AKeratinBHaemoglobinCMelaninDChlorophyllView AnswerDiscussWorkspaceReportSaveEasy
15Which is the longest bone in the human body?AFemurBHumerusCFibulaDTibiaView AnswerDiscussWorkspaceReportSaveEasy