Assessing the Risks of Oestrogen Pollution NOS: Assessing risks and benefits of scientific research: the risks to human male fertility were not adequately assessed before steroids related to proges...
The Placenta & the Exchange of Materials Mammals can be split into different categories on the basis of their?mechanism for foetal nourishment Placental?mammals, such as humans Monotremes, or e...
Role of hCG in Early Pregnancy Shortly after the developing embryo implants into the endometrium it begins secretion of the hormone?human chorionic gonadotropin?(hCG) hCG is secreted during the fir...
Implantation of the Blastocyst Following human fertilisation, the newly?fertilised ovum divides by mitosis?to form?two diploid nuclei?(i.e. each nucleus contains two sets of chromosomes) and the cy...
Preventing Polyspermy Fertilisation is the?fusion?of?one sperm cell?and?one ovum; this fusion of two haploid nuclei gives rise to a diploid zygote During sexual reproduction,?many sperm are release...
Similarities Between Oogenesis & Spermatogenesis Sexual reproduction?involves?fertilisation; the?fusion of sex cells, or?gametes, from two parents Gametes are?specialised,?haploid?cells The fus...
Drawing the Human Kidney The following elements should be included in a drawing of the human kidney The kidney should be?roughly oval in shape?with an?inward curve on the side?where it is?connected...
Treatment of Kidney Failure Kidney failure?can occur in one or both kidneys for a variety of reasons, such as Physical damage from an injury High blood pressure Diabetes Overuse of certain drugs (e...
Types of Nitrogenous Waste Nitrogenous waste?comes from the?breakdown of excess dietary amino acids?and?nucleic acids The waste is first converted into?ammonia; some organisms excrete it in this fo...
ADH Living organisms can maintain a?safe balance of water and solutes?in their bodies by?osmoregulation Osmoregulation?is an example of homeostasis The kidneys play an important role in osmoregulat...
Conserving Water & the Loop of Henlé Animals that live in dry environments such as deserts depend on their ability to?conserve water?for survival Such animals often have?very long loops of Henl...
Ultrastructure of the Glomerulus and Bowman's Capsule Introduction to kidney structure Humans have?two kidneys, which remove waste products from the blood and maintain the blood's balance of water ...
