作者NCKUM (成功大学医学研究所)
看板Cognitive
标题[请益] neuromuscular junction
时间Wed Sep 21 23:01:40 2011
The neuromuscular junction is very efficient, very faithful
(an action potential always generates a contraction), and it can fully control the innervated skeletal muscle (one skeletal muscle only
follows the “order” from one motor neuron). Explain how these
characteristics are achieved.
我找了课本 也没说为什麽
当讯息在神经细胞从轴突传达至突触时 钙离子的channel会打开始使钙离子进入突触
而造成神经传导物如Acetylcholine释放至肌肉细胞
肌肉细胞上acetylcholine receptor便会接收两个acetylcholine而产生一action
potential造成formation
troponin可侦测钙离子的浓度 troponin会与钙离子结合 使tropomysin向前推动
myosin binding site便会与myosin head结合 因此myosin与actin便会连结在一起。
当ATP水解时会使myosin形态改变 牵动actin造成肌肉收缩
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◆ From: 115.43.218.92
※ 编辑: NCKUM 来自: 115.43.218.92 (09/21 23:13)
※ NCKUM:转录至看板 Medicine 09/22 22:11
1F：推 mulkcs:你的问题主要是什麽呢?我感觉是one skeletal muscle follow 09/23 09:11
2F：推 mulkcs:one motor neuron 这句。 09/23 09:12
The neuromuscular junction is very efficient (it takes a very
short time to pass the signal from the motor neuron to the muscle), very
faithful (an action potential always generates a contraction), and it can
fully control the innervated skeletal muscle (one skeletal muscle only
follows the “order” from one motor neuron). Explain how these
characteristics are achieved.
但我不大知道怎解释
※ 编辑: NCKUM 来自: 115.43.218.92 (09/23 12:55)
※ NCKUM:转录至看板 Biology 09/23 23:45
3F：推 teamophoenix:我不确定我讲得对不对~~不过在muscle上应该不会讲 09/25 01:21
4F：→ teamophoenix:action potential 因为肌肉上不会有threshold，只有 09/25 01:22
5F：→ teamophoenix:神经上会讲action potential，motor neuron可以产生 09/25 01:25
6F：→ teamophoenix:的电讯号是all or none，所以每个action potential 09/25 01:27
7F：→ teamophoenix:都是一个相同大小的讯号，而鸡肉因为不是all or none 09/25 01:27
8F：→ teamophoenix:的action potential 且可以随着motor neuron刺激平率 09/25 01:28
9F：→ teamophoenix:增加而summation。我只是想跟你讲说不会用action 09/25 01:29
10F：→ teamophoenix:potential 这个词 09/25 01:30
11F：→ NCKUM:XD不是我出的题.. 09/25 15:13