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(单词翻译:双击或拖选)
Apatites- a family of calcium1 phosphate salts which are found in hard tissues like bone, teeth and shells.
Apoptosis - death of a cell which is programmed by a set of specific genes2. Apoptosis of chondrocytes allows osteoblasts to attach to their calcified3 matrix, and the epithelial cells forming webs between the fingers to die.
Articular - one of the bones which together with the quadrate bones and the dentary, made/make up a reptile's jaw4. In mammals the quadrate bone is incorporated into the middle ear as the malleus.
Artificial mouth - a laboratory device for keeping bacteria growing in a controlled environment It allows for observing bacteria and their growth under different experimental conditions.
Ascorbic acid - or Vitamin C is a dietary requirement for the proper formation of collagen. Deficiency causes scurvy5.
ATP - adenosine triphosphate - ATP is a convenient packet of energy used by both animals and plant cells. The energy in ATP is stored in its three negatively charged phosphate groups which are held close together, in spite of their repulsion for each other. This energy, multiplied many hundreds of thousand of times, for each cell is able to move our muscles, transport molecules7 across membranes8 and power all the cells other energy requirements. Once the energy has been used the ATP molecule6 now only has two phosphate groups. It needs energy now from either aerobic9 or anaerobic10 respiration11 to charge it up again, a process known as phosphorylation. Large stores of ATP are not kept as it is highly reactive. The long term storage of energy in animals is in carbon rich molecules, such as glycogen or fatty acids. In plants energy is stored as starch12.
Attachment13, see epithelial-attachment
Autocrine; cell messengers which are produced by the cell itself and regulate the expression of genes .
Autonomic nervous system - controls routine body functions such as gut14 activity, respiration, blood pressure and heart rate. There are two main divisions the sympathetic nervous system and the parasympathetic system.
Axon - the extension of a nerve cell, as a thin tube which may be as long a metre or a few short microns in length. The axon, like the cell body is able to depolarise and carry impulses along its length. The impulses from one axon to another nerve cell are transmitted at a synapse15. Axons may be myelinated or unmeyelinated, and they may vary in diameter. Thicker, myelinated axons transmit impulses faster than thins unmeyelinated axons.
1 calcium | |
n.钙(化学符号Ca) | |
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2 genes | |
n.基因( gene的名词复数 ) | |
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3 calcified | |
v.(使)钙化,(使)硬化( calcify的过去式和过去分词 ) | |
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4 jaw | |
n.颚,颌,说教,流言蜚语;v.喋喋不休,教训 | |
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5 scurvy | |
adj.下流的,卑鄙的,无礼的;n.坏血病 | |
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6 molecule | |
n.分子,克分子 | |
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7 molecules | |
分子( molecule的名词复数 ) | |
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8 membranes | |
n.(动物或植物体内的)薄膜( membrane的名词复数 );隔膜;(可起防水、防风等作用的)膜状物 | |
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9 aerobic | |
adj.需氧的,增氧健身法的,有氧的 | |
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10 anaerobic | |
adj.厌氧的 | |
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11 respiration | |
n.呼吸作用;一次呼吸;植物光合作用 | |
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12 starch | |
n.淀粉;vt.给...上浆 | |
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13 attachment | |
n.附属物,附件;依恋;依附 | |
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14 gut | |
n.[pl.]胆量;内脏;adj.本能的;vt.取出内脏 | |
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15 synapse | |
n.突触 | |
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