Biology Study guides, Class notes & Summaries

countercurrent heat exchanger - In ectotherms, a circulatory adaptation that is an arrangement of blood vessels that warm or cool the blood

rough ER - A network of interconnected membranous sacs in a eukaryotic cell's cytoplasm; covered with ribosomes that make membrane proteins and secretory proteins

AS BIOLOGY Paper 2

AS BIOLOGY Paper 1

AS BIOLOGY Paper 1

Which of the following occurs in the placenta? A) Eroding blood vessels in the endometrium bathe chorionic villi in pools of maternal blood. B) Fetal blood and maternal blood mix. C) All substances in maternal blood that may be harmful to the fetus are prevented from moving across the walls of the villi. D) The amnion and the chorion grow into the endometrium. E) Hormones are absorbed to prevent them from influencing the developing fetus.

Which of the following occurs in the placenta? A) Eroding blood vessels in the endometrium bathe chorionic villi in pools of maternal blood. B) Fetal blood and maternal blood mix. C) All substances in maternal blood that may be harmful to the fetus are prevented from moving across the walls of the villi. D) The amnion and the chorion grow into the endometrium. E) Hormones are absorbed to prevent them from influencing the developing fetus.

HBI013 FOUNDATION HUMAN BIOLOGY 1 Week 8 Lab 7: Mendelian Genetics

biology 1 week 8 BI206: Introductory Biology III Week 8 Lab Responses: The Human Hygiene Hypothesis