Which statement about the synapse is true: the action of acetylcholine-esterase
ID: 86618 • Letter: W
Question
Which statement about the synapse is true: the action of acetylcholine-esterase at the results in an increases in the amount of transmitter substance the inward movement of sodium ions at the terminal stimulate the of the synaptic the re-uptake process results in an increase in the level transmitter substance in the synaptic cleft the closing of potassium channel is an example of an excitatory chemically-gated channel the opening of sodium channels is an example of inhibitory chemically-gated channels Which of the following describes the relationship between stroke volume and blood pressure the preload relationship the afterload relationship cardiac contract capillary filtration and reabsorption increased venous filling causing increased stroke volume The small repolarization near the start of the cardiac muscle action potential is caused by: a. closing of the slow sodium/calcium channels the opening of calcium channels the closing of potassium channels the closing of fast sodium channels Professor Muntzel's imagination to make it look like his beloved state of Oregon In skeletal muscle, if calcium is not present, which action cannot happen: a. the myosin head can cleave ATP into ADP + P b. the myosin head can reset to its "ready" position the myosin head can with ATP the myosin head can bind with the binding site on actin the myosin head can detach from actin Which statement about skeletal muscle contraction is false: action potentials in the T-tubules stimulate the opening of calcium channels on the sareoplasmic reticulum calcium ATPase pumps function to pump calcium out of the sarcoplasmic reticulum an action potential is generated along the sarcolemma calcium ATPase pumps are found on the sarcolemma and on the membrane of the sarcoplasmic retieulus calcium levels in the sarcoplasmic reticulum are high, but calcium levels are low in the cytoplasm Which of the following would cause an increase in stroke volume: a. an increase in vein blood return to the heart causing a stretching of the heart muscle b. a very large increase in arterial pressure causing an increase in afterload c. an increase in parasympathetic nerve activity to the heart d. an injection of barbiturates e. a decrease in the force of myocardial contraction at a fixed muscle fiber lengthExplanation / Answer
49. a. The action of acetylcholine esterase at the cleft results in an increase in amount of transmitter substance.
Acetylcholine esterase catalyses the breakdown 9f acetylcholine at the synaptic cleft.
50. e. Increased venous filling causing increased stroke volume.
Increased venous filling raises cardiac output, thus raises stroke volume.
51. a. closing of slow sodium/ calcium channels.
52. d. The myosin head can bind with active site on actin.
The active site on actin is exposed as calcium binds troponin and the myosin head forms a cross bridge with actin. Moreover it allows the troponin to change shape and expose the actin-myosin binding site.
53. b. Calcium ATPase function to pump calcium out of the sarcoplasmic reticulum.
Instead it pumps calcium into the membrane of sarcoplasmic reticulum.
54. a. An increase in vein blood return to the heart causing a stretching of the heart muscle.
Return of venous blood thereby increases cardiac output. Thus raises sytoke volume too.
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