1. (i) The duct which transports urine from the kidney to the urinary bladder.   2. (ii) The endocrine gland which produces emergency hormone.   3. (iii) The sheet of muscle between the thorax and the abdomen of man.   4. (iv) The fluid that is present inside and outside the brain.   5. (v) The opening though which light enters the eyes.   6. (vi) Openings on the stem through which transpiration occurs.   7. (vii) The organ in man concerned with maintaining water balance in the body.   8. (viii) The photosensitive pigment present in the 'rod' cells in the retina.