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cAMPcGMPreceptor-channelsIP3DAGQuestion 540 / 1pointWhen calcium becomes available inside a cell, it comes from _______.extracellular fluid onlyintracellular storage only
extracellular fluid and intracellular storageit is always available as a major cytosol cationnone of the aboveQuestion 550 / 1pointNorepinephrine (NE) and epinephrine both bind to alpha receptors and elicit the same response. NE is therefore _____ of epinephrine.an agonistan antagonista competitoran agonist and competitoran antagonist and competitorQuestion 560 / 1pointWhich of the following gases is a vasodilator?O2HeNON2H2Question 570 / 1pointIbuprofen is a nonsteroidal anti-inflammatory drug (NSAID) that prevents inflammation by inhibiting ___________.
calmodulinlipoxygenasecyclooxygenase (COX)hydrogen sulfide (H2S)nitric oxide (NO)Question 580 / 1pointThe diameter of a blood vessel is controlled by varying the rate of a single output signal. This observation is best described by which of Walter Cannon's postulates used to explain control of homeostasis?The nervous system has a role in preserving the "fitness" of the internal environment.Some systems of the body are under tonic control.Some systems of the body are under antagonistic control.One chemical signal can have different effects in different tissues.None of the above are correct.Question 591 / 1pointWhich of the following represents the correct order of the steps in a reflex control pathway?stimulus → input signal → integrating center → sensor → output signal → target → responsestimulus → sensor → input signal → integrating center → output signal → target → responsestimulus → sensor → input signal → output signal → target → integrating center
→ responseQuestion 601 / 1pointWhich of the following is more characteristic of the nervous system than the endocrine system?very rapid responseuses both chemical and electrical signalsvery specificduration of action is very shortall of the above are more characteristic of the nervous systemQuestion 610 / 1 pointAn enzyme that catalyzes the breakdown of glycogen into glucose monomers might be named __________. glucosehexokinasesucraseglycogenasename cannot be predictedQuestion 620 / 1pointWhat is the final acceptor of electrons at the end of the electron transport chain?NADHATPFADH2oxygen
waterQuestion 630 / 1pointWhen a molecule is transported via facilitated diffusion _____.transport increases linearly with the concentration gradientan input of energy is requiredthere is a transport maximum because transport proteins are requiredthere is no transport maximumit moves directly through the phospholipid bilayerQuestion 641 / 1pointWhich of the following statements about the Na+/K+pump is FALSE?It transports Na+out of the cell and K+into the cell.