Which statement about the true: the action of acetylcholine- at the results in a

Question

Which statement about the true: the action of acetylcholine- at the results in an increase of the inward movement of sodium ions at the terminal stimulate the synthesis of the resistors. The re-uptake process results in an increase in the level of transistor in the shells. The closing of a potassium channel is an example of inhibitory chemically-gained channels  Which of the following describes the relationship between stroke volume and arterial blood presser's the preload relationship the after load relationship contractility 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: Closing of the slow sodium/calcium channels The opening of calcium channels The closing of potassium channels The closing of fast sodium channels Professor Minitel's imagination to make it look like his bellowed state of Oregon In skeletal muscle, if calcium is not present, which action cannot happen: the myosin head can cleave ATP into ADP + p the myosin head can reset to its "ready" position the myosin head can bind 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 sarcoplasmic 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 reticulum 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: an increase in vein blood return to the heart causing a stretching of the heart muscle a very large increase in arterial pressure causing as increase in afterload an increase in parasympathetic nerve activity to the heart an injection of barbiturates a decrease in the force of myocardial contraction at a fixed muscle fiber length

Explanation / Answer

Synapse is the junction between neurons. Synapse permits the transmission of chemical or electrical stimulus to pass from one neuron to the other. Synapse consists of presynaptic neuron, synaptic cleft and postsynaptic neuron. At the end of presynaptic neuron is voltage gated calcium channels. When action potential reaches the presynaptic neuron, these voltage gated calcium channels open causing calcium ions to flow into the cell. Calciumions cause fusion of synaptic vesicles with cell membrane and neurotransmitters are released into synaptic cleft by exocytosis.

Neurotransmitters bind to the receptors in postsynaptic membrane causing the channels to open. Reuptake of some of these neurotransmitters into presynaptic neuron takes place decreasing their concentration in synaptic cleft. Acetylcholine esterase enzyme present in the synaptic cleft also acts on these neurotransmitters and decrease their concentration. Opening of sodium channel opening is an example of excitatory and closing of potassium channel is an example of inhibitory chemically gated channel.

So, the answer for this question is option (b) the inward movement of calcium ions at the terminal stimulates the exocytosis of the synaptic vesicles.

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