CB官方推薦不同年級AP報考科目！
按往年慣例，通常9月份開始，不同考區(qū)就開始陸續(xù)報名。科目選擇會讓不少學(xué)生糾結(jié)，好在CollegeBoard給出了“官方標(biāo)準(zhǔn)”，列舉了不同年級熱門報考科目。目前AP開設(shè)了22個門類，37個學(xué)科的AP課程。AP課程共有38門學(xué)科...
IB DP Biology: HL復(fù)習(xí)筆記6.6.4 Reproduction: Sex Determination in Males
SRY Gene In?sexual reproduction?in?humans, a sperm from a male fuses with, or fertilises, an egg from a female to form a?zygote, which then develops into an?embryo To begin with the embryo develops...
IB DP Biology: HL復(fù)習(xí)筆記6.6.3 Reproduction: Background
William Harvey & Sexual Reproduction in Deer William Harvey (1578 - 1657) was an English?physician?who contributed greatly to our understanding of?anatomy?and?physiology He is mainly remembered...
IB DP Biology: HL復(fù)習(xí)筆記6.6.2 Hormones Continued
Leptin Leptin?is a?hormone?that is secreted by fat storage cells known as?adipose cells The concentration of leptin in the blood is controlled by the?amount of adipose tissue?in the body As we eat ...
IB DP Biology: HL復(fù)習(xí)筆記6.6.1 Hormones
Insulin & Glucagon The pancreas is an organ found in the abdomen of mammals It functions as both an?endocrine gland?and an?exocrine gland Endocrine glands secrete hormones?directly?into the blo...
IB DP Biology: HL復(fù)習(xí)筆記6.5.4 Skill: Neurones & Synapses
Analysis of Oscilloscope Traces It is possible to?measure membrane potentials?in neurones by placing electrodes on each side of the membrane A membrane potential is the?difference in charge?between...
IB DP Biology: HL復(fù)習(xí)筆記6.5.3 Synapses
Synapses Where two neurones meet, they do not actually come into?physical contact?with each other Instead, a very small gap, known as the?synaptic cleft, separates them The ends of the two neurones...
IB DP Biology: HL復(fù)習(xí)筆記6.5.2 Nerve Impulses
Resting Potential Neurones?transmit information in the form of?impulses, which travel extremely quickly along the neurone from one end to the other Note that an impulse is?not?an electrical current...
IB DP Biology: HL復(fù)習(xí)筆記6.5.1 Neurones: Function & Structure
Function & Structure of Neurones The nervous system The human nervous system consists of: Central nervous system?(CNS) – the?brain?and?spinal cord Peripheral nervous system?(PNS) – all of the?n...
