• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Homeostasis & Control of BGL.

Extracts from this document...


Homeostasis & Control of BGL Homeostasis Source - www.bbc.co.uk/schools/gcsebitesize/biology/humans/homeostasisrev1.shtml All the cells in our bodies are surrounded by a liquid called tissue fluid which has exactly the right conditions in which cells can work. Tissue fluid has the right temperature, the right amount of glucose and the right amounts of water and salt. Homeostasis is an important process that maintains these conditions at the right level. Source - http://pespmc1.vub.ac.be/ASC/HOMEOSTASIS.html A process of interaction which balances various influences and effects so that a stable state or a stable behaviour is maintained. Often that stable state or that stable behaviour is essential to assume structural stability of a SYSTEM. E.g., the size of the pupil of the human eye is negatively correlated with the intensity of light entering the retina thus keeping the amount of light within the limits of optimal processing of visual information. Too much light will destroy the light sensitive cones of the retina. The blood sugar content and many other chemical quantities are similarly balanced within the human body. In families, homeostasis may become pathological when family members no longer prefer that state yet cannot escape it as a consequence of the way they interact with one another (e.g., double bind). Source - http://pespmc1.vub.ac.be/HOMEOSTA.html Homeostasis is one of the most remarkable and most typical properties of highly complex open systems. ...read more.


The kidneys, lungs, liver & skin all help to keep the blood composition the same (homeostasis). Control of BGL The endocrine system plays an important part in maintaining the composition of the body fluids A rise in blood sugar after a meal stimulates the pancreas to produce insulin. The insulin causes the liver to remove the extra glucose from the blood & store it as glycogen. This helps to keep the concentration of blood sugar within narrow limits The brain monitors the concentration of the blood passing through it. If the concentration is too high, the pituitary gland releases ADH (antidiuretic hormone). When this reaches the kidneys (the target organs) it causes them to reabsorb more water from the blood passing through them. If the blood is too dilute, production of ADH is suppressed & less water is absorbed in the kidneys. Thus ADH helps to maintain the amount of water in the blood at a fairly constant level. Some of the endocrine glands are themselves controlled by hormones. EG. Pituitary hormones such as LH affect the endocrine functions of the ovaries. In some cases, the output of hormones is regulated by a process of negative feedback. The feedback between the pituitary and the ovaries produces fluctuations which cause the menstrual cycle. When the level of oestrogen in the blood rises, it affects the pituitary gland, suppressing it production of FSH (follicle-stimulating hormone). ...read more.


Source - www.paralumun.com Glucagon is in fact a hormone that is made naturally in the pancreas. It releases stores of glucose from the liver causing blood glucose levels to rise. Insulin, made naturally in the pancreas, lowers blood glucose as it helps the muscles to use glucose as energy. It is these two hormones that keep the blood glucose level stable in people without diabetes Insulin is a protein hormone and is the main factor in controlling a persons blood glucose level. It is produced by the islet cells of the pancreas when food is eaten or if the blood glucose level is high. In between meals the islet cells produce low levels of insulin to maintain the balance between the amount of sugar the liver produces and the use of sugar by the muscles, brain,etc. When food is eaten and the levels of insulin rise it stops the liver releasing sugar into the bloodstream and helps the liver to take up sugar to store as glycogen. Insulin also helps the muscle and fat cells to use glucose. The effects of insulin on the liver and other tissues tend to lower the blood glucose level. Insulin works to help a muscle cell use glucose by creating an opening to allow the glucose to pass into the cell. Insulin also activates proteins (enzymes) in the cell which help the cell either to store glucose as glycogen or use it for energy. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Exchange, Transport & Reproduction section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Exchange, Transport & Reproduction essays

  1. Marked by a teacher

    Human Reproductive System

    4 star(s)

    synthesis and secretion. The ovaries are covered with germinal epithelium underneath which is a connective tissue called tunica albuginea. The outer region of the ovary is called the cortex and the inner region is called the medulla. The cortex consists of ovarian follicles and stroma cells in between.

  2. Marked by a teacher

    The Effect Of Temperature On The Permeability Of The Cell Membrane

    3 star(s)

    This resulted in a tilt in the diffusion gradient, which caused an increase of anthocyanin leakage. The glycolipids, glycoproteins and membrane proteins stop functioning at higher temperature and these all give structural advantages to the membrane so their loss would weaken the membrane structure significantly.

  1. Marked by a teacher

    What is Type 1 diabetes

    3 star(s)

    Very small children normally don't need an injection at night, but will need one as they grow older. Older children have short-acting insulin before every main meal and long-acting insulin at night. Insulin is typically given in insulin pens with very fine needles.

  2. Rate of Respiration

    and I will use 2 controls per each experiment (test tubes containing separate mixtures of substrate and yeast). However in my plan I stated I will conduct 15 experiments per substrate however this will be too time consuming therefore I will pool my data.

  1. The Endocrine System

    The endocrine glands appear unique in that the hormones they produce do not pass through tubes or ducts. The hormones are secreted directly into the internal environment, where they are transmitted via the bloodstream or by diffusion and act at distant points in the body.

  2. The Skeletal and Muscular System

    Smooth Muscle Smooth Muscle Smooth muscle comprises a large number of small individual cells. They are spindle shaped, narrow at the ends and wide in the middle. Each cell has a nucleus in the middle. There are no striations in the sarcoplasm and there are no dark or light bands present.

  1. Regulation and Control Homeostasis.

    * Iron from red blood cells is either stored in the liver or used in the formation of new blood cells by the bone marrow. Detoxification: * The liver renders harmless or removes toxic materials absorbed by the intestines. * Kupffer cells ingest foreign organisms or material, while toxic chemicals (e.g.

  2. Evolution and Biodiversity - Edexcel GCE Biology Revision Notes

    - Seeds are screened suing x-ray, to ensure they contain fully developed embryos. * Advantages of seedbanks includes: - Cheaper to store seeds than fully grown plants - Large number of seed can be stored as they required less space.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work