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...
Male & Female Diagrams You should be able to?annotate diagrams?of the female and male?reproductive systems?to show the names of the different?structures You should also be able to recall the?fu...
Oestrogen & Progesterone During early development an embryo develops?embryonic?gonads?that will either become?ovaries?in females or?testes?in males The factor that determines whether the embryo...
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...
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...
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 ...
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...
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...
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...
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...
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...
Practical 6: Monitoring Ventilation The volume of air within the lungs of an individual will change depending on their level of activity When at rest, breathing is shallow and slow When exercising,...
