bab.sistem saraf - neurotransmiter - biologi sma kelas materi pembahsan

In this video, the focus is on understanding neurotransmitters and their role in the nervous system, particularly in the transmission of impulses between neurons through synapses. The discussion begins with a recap of synapses, specifically chemical synapses that contain vesicles filled with neurotransmitters. Neurotransmitters are defined as chemical compounds responsible for transmitting information from the presynaptic neuron to the postsynaptic neuron. The video categorizes neurotransmitters into two types based on their effects: excitatory and inhibitory. Excitatory neurotransmitters, such as acetylcholine and histamine, lead to depolarization of the postsynaptic membrane, increasing the likelihood of impulse transmission. In contrast, inhibitory neurotransmitters, like GABA and serotonin, cause hyperpolarization, making it less likely for impulses to be generated. The video concludes by encouraging viewers to ask questions and engage with future content on the topic.