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【正文】 the term is also used for the length r of this segment, ., the mon distance of all points on the curve from the center. Similarly, the circumference of a circle is either the curve itself or its length of arc. A line segment whose two ends lie on the circumference is a chord。 the use of huge canvases。 in glands, smooth muscle, and the heart they are ‘muscarinic’。 見(jiàn)《大學(xué)語(yǔ)文》 P178 作業(yè) 4 一、填空題 曲波，梁斌，楊 沫 白先勇 《干校六記》 《長(zhǎng)恨歌》 古希臘羅馬 但丁，《神曲》 《懺悔錄》，《愛(ài)彌兒》 《悲慘世界》，《九三年》 《紅與黑》 《歐也妮 見(jiàn)《大學(xué)語(yǔ)文》 P50— 51 作業(yè) 2 一、填空題 明，卓吾，“童心” 竟凌，鐘潭 二、名詞解釋 梧桐派 見(jiàn)《大學(xué)語(yǔ)文》 P85 三、 解釋語(yǔ)段中加點(diǎn)的詞 見(jiàn)《大學(xué)語(yǔ)文》 P91（注釋?zhuān)? 見(jiàn)《大學(xué)語(yǔ)文》 P103（注釋?zhuān)? 四、 簡(jiǎn)答題 。 見(jiàn)《大學(xué)語(yǔ)文》 P57 五、分析題 《史記 見(jiàn)《大學(xué)語(yǔ)文》 P152 簡(jiǎn)述沈從文《老伴》的主要內(nèi)容。 見(jiàn)《大學(xué)語(yǔ)文》 P215— 216 請(qǐng)您刪除一下內(nèi)容， O(∩ _∩ )O謝謝?。?！ 2021年中央電大期末復(fù)習(xí)考試小抄大全，電大期末考試必備小抄，電大考試必過(guò)小抄Acetylcholine is a neurotransmitter released from nerve endings (terminals) in both the peripheral and the central nervous systems. It is synthesized within the nerve terminal from choline, taken up from the tissue fluid into the nerve ending by a specialized transport mechanism. The enzyme necessary for this synthesis is formed in the nerve cell body and passes down the axon to its end, carried in the axoplasmic flow, the slow movement of intracellular substance (cytoplasm). Acetylcholine is stored in the nerve terminal, sequestered in small vesicles awaiting release. When a nerve action potential reaches and invades the nerve terminal, a shower of acetylcholine vesicles is released into the junction (synapse) between the nerve terminal and the ‘effector’ cell which the nerve activates. This may be another nerve cell or a muscle or gland cell. Thus electrical signals are converted to chemical signals, allowing messages to be passed between nerve cells or between nerve cells and nonnerve cells. This process is termed ‘chemical neurotransmission’ and was first demonstrated, for nerves to the heart, by the German pharmacologist Loewi in 1921. Chemical transmission involving acetylcholine is known as ‘cholinergic’. Acetylcholine acts as a transmitter between motor nerves and the fibres of skeletal muscle at all neuromuscular junctions. At this type of synapse, the nerve terminal is closely apposed to the cell membrane of a muscle fibre at the socalled motor end plate. On release, acetylcholine acts almost instantly, to cause a sequence of chemical and physical events (starting with depolarization of the motor endplate) which cause contraction of the muscle fibre. This is exactly what is required for voluntary muscles in which a rapid response to a mand is required. The action of acetylcholine is terminated rapidly, in around 10 milliseconds。s turbulent yet elegant abstract paintings, which were created by spattering paint on huge canvases placed on the floor, brought abstract expressionism before a hostile public. Willem de Kooning39。 technically, the slope m of a straight line is the (trigonometric) tangent of the angle it makes with the xaxis. If the line is parallel to the xaxis, its slope is zero. Two or more lines with equal slopes are parallel to one another. In general, the slope of the line
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