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When a hormone opposes the action of another hormone it is called?
an antagonistic hormone
What chemical is released by platelets that cause vessels to construct?
Platelets release a chemical called serotonin, which plays a key role in vasoconstriction. When platelets aggregate at the site of a blood vessel injury, serotonin acts to narrow the blood vessels, reducing blood flow and helping to minimize blood loss. Additionally, thromboxane A2, another substance released by activated platelets, also contributes to vasoconstriction and promotes further platelet aggregation.
What is A2 size in cm?
A2 size is typically 42.0 x 59.4 cm.
Is dissolved aspirin reversible?
No. Aspirin prevents the synthesis of Thromboxane A2 which induces platelet aggregation (formation of a clot) and platelet release reaction. Aspirin inhibits this platelet aggregation for the life of the platelets, which is between 7-10 days. The cool thing with aspirin is that it thins your blood, the bad thing is that it thins your blood and if you want to stop taking aspirin (for any reason, even before surgery) you have a 3x increase of stroke or heart attack for 8-10 days because of its rebound effect. Aspirin is a light-weight compared to Heparin or Coumadin, but Heparin is easily reversed with Protamine-sulfate solution 1% and Coumadin with Vitamin K - something to think about. Maybe one day a drug will be created to reactivate Thromboxane A2 synthesis, but not yet. Trust your PA-C's.
What is the motion that opposes the motion of an object through liquid?
Viscosity opposes the motion of an object through liquid.
Where are the chiral centers for thromboxane A2?
3
What chemical constricts blood vessels until clotting occurs?
antidepressants and smoking
What are the potent platelet aggregates that attract more platelets to an injury site?
Adenosine diphosphate (ADP), Serotonin, and thromboxane A2
How aspirin causes increased prothrombin time?
It decreases synthesis of thromboxane A2 and prostaglandins to increase bleeding time. It does not affect PT or PTT. Prothrombin time unaffected!
What is a prostaglandin hormone made from?
They are synthesized in the cell from the essential fatty acids (EFAs). An intermediate arachidonic acid is created from diacylglycerol via phospholipase-A2, then brought to either the cyclooxygenase pathway or the lipoxygenase pathway to form either prostaglandin and thromboxane or leukotriene respectively. The cyclooxygenase pathway produces thromboxane, prostacyclin and prostaglandin D, E and F. Alternatively, the lipoxygenase enzyme pathway is active in leukocytes and in macrophages and synthesizes leukotrienes. Dr.Fabianski Benjamin
When a hormone opposes the action of another hormone it is called?
an antagonistic hormone
What is function thromboxan in blood?
Thromboxane is a potent platelet agregator
Which hormone is secreted in the pancreas and oppose the action of insulin?
The hormone secreted in the pancreas that opposes the action of insulin is glucagon. Thanks
Structure activity relationship of antiplatelet drugs?
More correctly it is called antiplatelet aggregation drugs (also called antithrombotic drugs) that include aspirin, clopidogrel, abciximab (monoclonal antibodies) and GPII/ IIIA receptors antagonists etc. Each drug has its own way and mechanism of action. It depends upon chemical structure of drug and site of action. Aspirin blocks aggregation by inhibiting cycloxygenase that produce thromboxane A2 that causes platelet aggregation. Clopidogrel acts as antagonist to P2Y2 receptors present on platelets required for their aggregation. You can check for further details. Umar Mujahid Pharm.D u.mujahid@yahoo.com
What is the answer to a squared plus -5a squared - a squared - a?
a2 + -5a2 - a2 - a = a2 - 5a2 - a2 - a = a2 - 6a2 - a = -5a2 - a
Congressman Smith opposes military action because he is weak and cowardly. Which logical fallacy does this example contain?
Ad hominem
What is antagonistic muscles?
A antagonist muscle is a muscle that opposes the action of another muscle. The Triceps Brachii is the antagonist of the Biceps Brachii.
