The binding of ligands to many G-proteins linked receptors leads to shortlived increase in the concentration of certain extracellular signaling molecules called first messenger decrease in the concentration of certain extracellular signaling molecules called first messenger increase in the concentration of certain intracellular signaling molecules called second messenger decrease in the concentration of certain intracellular signaling molecules called second messenger TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is a hormone whose action requires a cell surface receptor? Growth factors Progesterone Adrenaline Nitric oxide TRUE ANSWER : ? YOUR ANSWER : ?
The signaling molecules called steroid hormones bind to cell surface receptors to trigger chemical cascades are made in one location of the body but have their effects some distance away are hydrophilic and so cannot penetrate the plasma membrane never enter the blood of humans TRUE ANSWER : ? YOUR ANSWER : ?
In paracrine signaling, the signaling molecules affects only None of these both (a) and (b) target cells close to the cell from which it was secreted target cells distant from its site of synthesis in cells of an endocrine organ TRUE ANSWER : ? YOUR ANSWER : ?
In vasodilation, proper nerve signals sent to blood vessels cause All of these the release of nitric oxide from endothelial cells reduced blood pressure relaxation of smooth muscle cells TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following comes under the category of cell surface receptor? Ion-channel linked receptors G protein linked receptors Enzyme linked receptors All of these TRUE ANSWER : ? YOUR ANSWER : ?
Small charged molecules, often biogenic amines function as neurotransmitters none of these both (a) and (b) hormones TRUE ANSWER : ? YOUR ANSWER : ?
Nitroglycerin has long been administered to human patients suffering from chronic chest pain (angina). This medication works because it is broken down into hormones that affect the heart breaks down into nitric oxide, which increases blood flow to the heart mimics the action of signal receptors interferes with chemical cascades that trigger contraction of heart muscle TRUE ANSWER : ? YOUR ANSWER : ?
cAMP and cGMP are derived from GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively ATP and GTP by the actions of guanylate cyclase and adenylate cyclase respectively ATP and GTP by the actions of adenylate cyclase and guanylate cyclase respectively None of these TRUE ANSWER : ? YOUR ANSWER : ?
If a disease of the blood vessels caused the endothelial cells of the vessel to die, what effect would that have on the cellular activities associated with vasodilation? All of these Nitric oxide would no longer be produced Smooth muscle cells could not be made to relax It would be more difficult to increase blood flow and reduce blood pressure TRUE ANSWER : ? YOUR ANSWER : ?