INTRODUCTION This assignment is about the study of the effect of agonist and different concentration on guinea pig ileum and it will consist of method, graph results and discussion. Drug is defined as a chemical that has both biological and pharmacological effects on human. Its branch is pharmacology which can be divided into two branches namely pharmacodynamics and pharmaco kinetics. (C. Stephen and W. Robin (2010)) Pharmaco dynamic is about what drug does to the body and pharmaco kinetics is the study of what the body does to the drug. Drugs may produce certain effects on the cardiac muscles example ephedrine may increase heartbeat, stimulation of nerve ending in the nervous system is caused by amphetarine drug which produces changes in …show more content…
In this experiment, a programmed guinea pig ileum was used because it stimulates effects of various drugs on guinea pig ileum and has similar digestive system as humans so it will be better to study the effects of drugs on guinea pig ileum. Aim: The Aim is to obtain dose response data for agonist and calculate for ED50 and PA2 values. Secondly, to observe the effects of agonists and three different concentration of an antagonists in guinea pig ileum. Method: The organ bath file was opened and we examined tissue type and Agonist and Antagonists of different drugs which were available. Guinea pig ileum was selected as tissue type and Acetyl choline as agonists. Then different amount of acetylcholine were added to the organ bath which produced different results and finally, a log – dose response curve for acetyl- choline was constructed with the X axis corresponding to drug dose (Drug concentration) and the Y axis corresponding to response (gms). Then we calculated for (ED50) and (ECR) with the help of the graph. RESULTS FOR ACETYLCHOLINE AND NON …show more content…
Ach Control Conc. Ach Atropine 1 x 10-8 M Conc. Ach Atropine 1 x 10-7 M Conc. Ach Atropine 1 x 10-6 M 3.33×10-9 0 6.67×10-8 0 6.66×10-7 0 6.67×10-6 0 9.99×10-9 12 6.66×10-7 8 7.67×10-6 5 7.55×10-5 10 1.66×10-8 18 3.32×10-6 32 6.90×10-6 10 8.52×10-5 21 2.66×10-8 26 1.64×10-5 51 7.0×10-6 20 3.39×10-5 33 3.32×10-8 33 1.96×10-4 52 8.0×10-6 57 1.28×10-3 50 4.31×10-8 37 3 .28×10-4 55 9.09×10-6 55 6.69×10-3 52 6.29×10-8 39 2.60×10-3 56 5.25×10-5 59 9.50×10-3 58 5.31×10-7 60 3.23×10-3 57 1.20×10-5 60 5.02×10-4 58 -l0g A1= 10-8=8 -log A2= 10-7=7 -LOG A3= 10-6=6 -log A4= 10-10=10 (ECR) For Drug1 = ED 50 (A1)/Control = 3/3=1 E.CR For Drug 2= ED 50 (A2)/ control = 6/3=2 E C R for drug 3 = ED50 (A3) = 9/3=3 Log (ECR1-1) =1 Log (ECR2-1) =2 Log (ECR3-1)
The US FDA conducted a scientific analysis using a computational model to determine the compound in
Beta-2 agonists are used as short acting (reliever) and long acting (maintenance) beta agonists. This means
At intermediate doses, dopamine acts on β1 receptor by releasing noradrenaline from nerve terminal and cause inotropic effect and possibly little chronatropic effect. Increase force of cardiac contraction will increase oxygen consumption and able to reduce coronary vascular resistance. At high dose, dopamine stimulates α1 receptor and cause general
Congestive heart failure is a serious condition associated with reduced cardiac оutput, hyperthrоphy of the myоcardium, and stimulatiоn of the sympathetic NS. This results in down regulation of the beta AR number and cAMP in response to the оverstimulatiоn. Agonists of those receptors increase the cAMP levels, inverse agonists reduce those levels. However, it has been shown in vivo that inverse agonists such as metoprolol and bispolol cause improvement in mortality rates in mice models, xamoterol – an agonist used increased the mortality, while carvedolol – a neutral antagonist, did not have any effect (Greasley and Clapham, 2006).
Introduction: Myelomeningocele , commonly known as Spina Bifida, is a birth defect in which the spinal cord does not develop properly due to incomplete closure of the neural tube at 28 days of gestation. The overlying bones and skin are incompletely formed and the underdeveloped area of the spinal cord is exposed on the surface of the back. It is the most common multicomplex birth defect affecting the central nervous system that results in permanent disability . With advances in treatment modalities, technologies and scientific breakthroughs, persons with spina bifida in the US are living well into adulthood. Myelomeningocele management includes life -long comprehensive neurologic, urologic, musculoskeletal , skin and habiliation management.
William McKim in chapters 1, 2, 3, 5 and 14 looks at some basic pharmacology, research design and the behavioral analysis of drug effects, tolerance withdrawal, sensitization and conditioning of drug effects, dependence addiction and the self administration of drugs as well as antidepressants and mood stabilizers. A drug in its most basic form is defined as “a substance that alters the physiology of the body” (p. 1) and is comprised of a chemical name, a generic name and trade name. The chemical name is used by chemists to identify what the molecules of a drug looks like while the generic name is a shorter version of the chemical name. The trade name on the other hand, is the property of the company that sells the drug. The effect of a drug
After 90 seconds a second washout occurs. At 180 seconds the length of the guinea pig ileum is reset to 2cm (note. The aforementioned steps are called the 3 minute cycle). Another dose of acetylcholine is added which follows the 3 minute cycle, however the concentration is increased by 1 x 10⁻⁸ M . This is repeated until the maximum response of acetylcholine
Dosage Ratio X Conversion Factor Ratio X Ordered Dosage Ratio IV Flow Rate mL/h = (Total mL)/(Total
Loperamide is a potent Mu-opioid receptor agonist [13, 15] that acts on the myenteric plexus of the gut wall. It inhibits acetylcholine release from the myenteric plexus and inhibits the peristalsis. It also increases the tone of anal sphincter. Loperamide also inhibits the secretions directly by interacting with calmodulin, this may be responsible for the anti diarrheal action. [16] Activating the Mu receptor prolongs the orocecal and colonic transit times by disrupting the gut’s electrical activity, increasing gut capacity, and delaying the passage of fluids through the small intestine, it has no direct effect on absorption [17] and when used to manage patients with ileostomy diarrhea investigators have obtained significant reduction in faecal loss, improvement in electrolytes and fluid balance have with loperamide therapy.
Tolerance is caused due to the ability of brain to adapt to or compensate for the presence of a chemical. The development of tolerance after being repeatedly exposed to a particular drug can be explained through two possible biological processes. One of the processes involves a decline in the concentration of the particular drug at the effector site due to changes in the distribution, excretion, absorption and metabolism of the drug. The second process involves changes in the sensitivity towards a drug due to adaptive changes which diminish the earlier effects of a drug. The nervous system has the ability to adapt and as a result, reduces the earlier effects of a drug through the use of two methods.
METHODS Animals The present experiments were approved by the Animal Care and Use Committee of our university (No. IZ 27 - 117, 139). The studies were conducted in male C57/ BL6j mice (21–27 g). The mice were housed in a controlled light (lighted from 8:00 to 20:00) and temperature (23–25°C) environment. Food and water were freely available. Drugs Morphine hydrochloride (Takeda Pharmaceutical, Tokyo, Japan) was dissolved in physiological saline.
Later, 5ml of 1 x 10-6 M of mepyramine was added into the reservoir containing 1000ml of Krebs-Henssleit solution to produce a FBC of 5.0 x 10-9M. It was equilibrated with tissue for 10 minutes by flushing into the organ bath. After that, the steps above were repeated to test tissue response using 5ml of 1 x 10-5M and 1 x 10-4M of mepyramine. The experiment was repeated by replacing mepyramine with SIPBSDrug A as the antagonist. Lastly, concentration-response curve with Hill-Langmuir equation and Schild Plot were plotted using Bio-Graph. KB and pA2 values for mepyramine and SIPBSDrug A were calculated based on Schild plots and Gaddum
CONSTIPATION DURING PREGNANCY: A condition in which there is difficulty in emptying bowel for less than 3 times a week associated with dry and hardened stool. About 50% of pregnant women suffer from constipation during any their pregnancy period predominantly in 1st and 3rd trimesters.
Antagonists of ion channels are substances that bind into the pores of these channels and block their activity. Since the flow of ions through the channels is blocked, the changes in the electrochemical gradient surrounding the membrane cause changes in transmission of signals. This can alter the transmission of nerve impulses as well as bring about other effects in the body like muscle contractions, heart rate, etc. Examples of channel blockers include Calcium channel blockers, Potassium channel blockers, Chloride channel blockers and Sodium channel
It is likely the result of a multifactorial aetiology, and any single standard theory will be imprecise.1 However, two main theories regarding the pathophysiology of rectal