Osmoregulation The control of the?water potential?of body fluids is known as?osmoregulation Osmoregulation is a key part of?homeostasis Specialised?sensory neurones, known as?osmoreceptors, ...
Ultrafiltration The nephron is the?functional unit?of the kidney – the nephrons are responsible for the?formation of urine The process of urine formation in the kidneys occurs in?two stages:...
Structure of the Kidney and the Nephron Humans have?two?kidneys The kidneys are responsible for carrying out two very important functions: As an?osmoregulatory organ?-?they regulate the wate...
Required Practical: Producing a Dilution Series and Calibration Curve An alternative version of Benedict’s solution can be used to carry out a?quantitative?test on an unknown?urine sample?to...
The Causes of Diabetes There are over 3 million people suffering from diabetes in the UK Diabetes is a condition in which the homeostatic control of blood glucose has failed or deteriorated ...
The Role of the Liver in the Conversion Between Glycogen & Glucose The liver plays a vital role in the conversion between glycogen and glucose The conversion between these molecules help...
The Role of Adrenaline A hormone called?adrenaline?can affect blood glucose concentration When it is secreted it?increases the concentration of blood glucose It does this by binding to?diffe...
The Action of Glucagon If the concentration of glucose in the blood?decreases?below a certain level, cells may not have enough glucose for?respiration?and may not be able to function normall...
The Action of Insulin If the concentration of glucose in the blood?decreases?below a certain level, cells may not have enough glucose for?respiration?and may not be able to function normally...
Negative Feedback The majority of homeostatic control mechanisms in organisms use?negative feedback?to maintain?homeostatic balance?(ie. to keep certain physiological factors, such as blood ...
Investigating Muscle Fatigue Prolonged or sustained exercise requires the?repeated contraction?of muscles Over time this can cause muscles to?fatigue?so they are no longer able to contract a...
Slow & Fast Skeletal Muscle Fibres There are two types of muscle fibres found in muscles Fast?fibres Slow?fibres Human muscles are made up of both types of muscle fibres Some musc...
