42. What is the substance that stimulates the production of red bloodcells? Which is the organ that secretes it? Under what conditions does this secretion increase?
Gap-fill exercise
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!