Human Biology. MCQ Unit 2. 1.Which of these events produces the normal sounds of heart beat heard through a stethoscope?. Contraction of the atria Contraction of the ventricles Closing of the heart valves Opening of the heart valves.
5.The concentration of urea in plasma is 0.2 g/100cm the pancreas?3, and in urine it is 1.26 g/100cm3.By how many times has the urea been concentrated by the activity of the kidney?
What would be the volume of CO2 breathed out during the first two minutes after the race?
- trick question….