[請益] neuromuscular junction
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.
我找了課本 也沒說為什麼
當訊息在神經細胞從軸突傳達至突觸時 鈣離子的channel會打開始使鈣離子進入突觸
而造成神經傳導物如Acetylcholine釋放至肌肉細胞
肌肉細胞上acetylcholine receptor便會接收兩個acetylcholine而產生一action
potential造成formation
troponin可偵測鈣離子的濃度 troponin會與鈣離子結合 使tropomysin向前推動
myosin binding site便會與myosin head結合 因此myosin與actin便會連結在一起。
當ATP水解時會使myosin形態改變 牽動actin造成肌肉收縮
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◆ From: 115.43.218.92
※ 編輯: NCKUM 來自: 115.43.218.92 (09/21 23:13)
※ NCKUM:轉錄至看板 Medicine 09/22 22:11
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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.
但我不大知道怎解釋
※ 編輯: NCKUM 來自: 115.43.218.92 (09/23 12:55)
※ NCKUM:轉錄至看板 Biology 09/23 23:45
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