IB DP Chemistry: HL復(fù)習(xí)筆記1.1.2 Equations
Balancing Equations A?symbol?equation is a shorthand way of describing a chemical reaction using?chemical symbols?to show the number and type of each atom in the reactants and products A?word?equat...
IB DP Chemistry: HL復(fù)習(xí)筆記1.1.1 Elements, Compounds & Mixtures
Elements & Compounds Elements are substances made from one kind of atom Compounds are made from two or more elements?chemically combined Elements take part in chemical reactions in which new su...
IB DP Biology: HL復(fù)習(xí)筆記11.4.7 Skills: Annotating Sexual Reproduction Diagrams
Annotating the Seminiferous Tubule and Ovary Annotating the Seminiferous Tubule The testes contain many small tubes, or?tubules, known as?seminiferous tubules The production of sperm, or?spermatoge...
IB DP Biology: HL復(fù)習(xí)筆記11.4.6 Oestrogen Pollution
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...
IB DP Biology: HL復(fù)習(xí)筆記11.4.5 The Placenta
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...
IB DP Biology: HL復(fù)習(xí)筆記11.4.4 Hormones in Pregnancy
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...
IB DP Biology: HL復(fù)習(xí)筆記11.4.3 Pregnancy
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...
IB DP Biology: HL復(fù)習(xí)筆記11.4.2 Fertilisation
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...
IB DP Biology: HL復(fù)習(xí)筆記11.4.1 Oogenesis & Spermatogenesis
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...
