1. ELECTRIC (ELECTRONIC) SYNAPSES Another type of synapse, the electri terjemahan - 1. ELECTRIC (ELECTRONIC) SYNAPSES Another type of synapse, the electri Bahasa Indonesia Bagaimana mengatakan

1. ELECTRIC (ELECTRONIC) SYNAPSES A

1. ELECTRIC (ELECTRONIC) SYNAPSES
Another type of synapse, the electric (electronic) synapse, is relatively rare in the mam- 64 The Human Nervous System malian nervous system. In these synapses, there is cytoplasmic continuity between two adjacent neurons through 1.5-nm channels. Because of this continuity, ions can flow between cells at these junctions; these lowresistance “gap junctions” result in “electrically coupled” neurons. In these synapses, no transmitter is involved. There is essentially no synaptic delay, because the electrical activity readily spreads from neuron to neuron. Because these synapses cannot be modulated, they are not compatible with most neural functions. However, they are occasionally found where activity must be tightly synchronized, as, for example, in the circuits involved with stereotypic saccadic eye movements (Chap.16), in the junctions (nexus) between smooth muscle cells involved in peristalsis of the gut, and between cardiac muscle fibers (intercalated disks) in synchronizing the heart beat (Fig. 2.3).
Because the current can flow across gap junctions in either direction, it might be difficult to decide which is the presynaptic and which is the postsynaptic side of the junction. They can be either, especially when the electric synapse adjoins two dendrites, two cell bodies, or two axons. Evidence suggests that, at some gap junctions, there is only a unidirectional transport of ions.
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1. ELECTRIC (ELECTRONIC) SYNAPSES Another type of synapse, the electric (electronic) synapse, is relatively rare in the mam- 64 The Human Nervous System malian nervous system. In these synapses, there is cytoplasmic continuity between two adjacent neurons through 1.5-nm channels. Because of this continuity, ions can flow between cells at these junctions; these lowresistance “gap junctions” result in “electrically coupled” neurons. In these synapses, no transmitter is involved. There is essentially no synaptic delay, because the electrical activity readily spreads from neuron to neuron. Because these synapses cannot be modulated, they are not compatible with most neural functions. However, they are occasionally found where activity must be tightly synchronized, as, for example, in the circuits involved with stereotypic saccadic eye movements (Chap.16), in the junctions (nexus) between smooth muscle cells involved in peristalsis of the gut, and between cardiac muscle fibers (intercalated disks) in synchronizing the heart beat (Fig. 2.3). Because the current can flow across gap junctions in either direction, it might be difficult to decide which is the presynaptic and which is the postsynaptic side of the junction. They can be either, especially when the electric synapse adjoins two dendrites, two cell bodies, or two axons. Evidence suggests that, at some gap junctions, there is only a unidirectional transport of ions.
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1. ELECTRIC (ELECTRONIC) sinapsis
Tipe lain dari sinaps, listrik (elektronik) sinaps, relatif jarang terjadi di mam- 64 Sistem Saraf Manusia sistem saraf Mali. Dalam sinapsis ini, ada kontinuitas sitoplasma antara dua neuron yang berdekatan melalui saluran 1.5-nm. Karena kontinuitas ini, ion dapat mengalir antara sel-sel di persimpangan ini; ini lowresistance "gap junction" menghasilkan "elektrik digabungkan" neuron. Dalam sinapsis tersebut, tidak ada pemancar yang terlibat. Ada dasarnya ada penundaan synaptic, karena aktivitas listrik mudah menyebar dari neuron ke neuron. Karena sinapsis ini tidak dapat diatur, mereka tidak kompatibel dengan sebagian besar fungsi saraf. Namun, mereka kadang-kadang ditemukan di mana aktivitas harus erat disinkronisasi, seperti, misalnya, di sirkuit yang terlibat dengan gerakan mata saccadic stereotypic (Chap.16), di persimpangan (perhubungan) antara sel-sel otot polos yang terlibat dalam gerakan peristaltik dari usus, dan antara serat otot jantung (disk diselingi) di sinkronisasi jantung berdetak (Gambar. 2.3).
Karena saat ini dapat mengalir di celah persimpangan di kedua arah, mungkin akan sulit untuk memutuskan yang merupakan presinaptik dan yang sisi postsynaptic dari persimpangan. Mereka dapat berupa, terutama ketika sinaps listrik berbatasan dua dendrit, dua badan sel, atau dua akson. Bukti menunjukkan bahwa, di beberapa persimpangan kesenjangan, hanya ada transportasi searah ion.
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