Renal Replacement Therapy (RRT) Overview. Overview of RRT. Renal replacement therapy (RRT) is required when the kidneys are functioning at less than 10â15 percent. Dialysis. People with advanced chronic renal failure (CRF), kidney failure, who have progressed to end-stage renal disease (ESRD) usually require dialysis.
Rod cells are far more numerous than cone cell. Cones cells are far fewer than rod cells. Usually located around the periphery of retina. Usually located in the centre of retina. All rod cells are alike, and do not give colour vision. Cones are of three types: blue, green and red, and give colour vision.
Pollen cones are much smaller than their woody seed cone counterparts; they are usually produced in clusters at the tips of the lower branches of a tree. Mount a small amount of conifer pollen in a drop of water on a slide, and examine it with the aid of your compound microscope.. Understand the differences between male (pollen) and female (seed) pine cones. 4. Know the locations and functions of a pine micropyle, integument, pollen chamber, and nucellus. 5. Know the function of the bladders or wings on pine pollen grains.