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,...
Cancer NOS: Obtain evidence for theories: epidemiological studies have contributed to our understanding of the causes of lung cancer Theories?are developed based on?evidence?collected through obser...
Inspiration & Expiration Breathing in The breathing-in, or?inspiration, process causes the?volume of the chest to increase?and the?air pressure to decrease?until it is?lower than the atmospheri...
