The correct order is:
- Action potential arrives at the axon terminal.
- Calcium ions enter the axon terminal.
- Synaptic vesicles fuse to membrane of axon terminal.
- Acetylcholine is released into the synaptic cleft.
- Acetylcholine binds to its receptors on the junctional folds.
- Junctional folds become depolarized.
- Action potential is initiated on the sarcolemma.
Action potential travels through the membrane of the presynaptic cell causing the channels permeable to calcium ions to open. Ca2+ flow through the presynaptic membrane and increase the Ca concentration in the cell which will activate proteins attached to vesicles that contain a neurotransmitter (e.g. acetylcholine). Vesicles fuse with the membrane of the presynaptic cell, thereby release their contents into the synaptic cleft-space between the membranes of the pre- and postsynaptic cells. Neurotransmitter binds to its receptors on the postsynaptic membrane and its binding causes depolarization of the target cell (muscle cell).
Answer:
X: Producers undergo photosynthesis
Y: Decomposers return carbon to the soil and release
waste.
I think the correct answer from the choices listed above is option A. Tuber is considered as a modified stem. These type of stems carry out special functions that are important for the plant to survive. Tubers serves as a food reserve and bearing buds wherein new plants can grow.
I don't see the choices, but I can help explain them to you! :) A Tropical Dry Forest has extremely high temperatures year round and doesn't get as much rain as a tropical rain forest. There tends to be more dry times of the year than wet, but when it rains, it rains a lot. On the other hand though, a Tropical Rain Forest has very humid and a really wet and soggy climate year round. It's extremely rare for this forest not to rain. I hope this cleared some things up for you! Hope this helped! :)