Answer:
8,324,608
Explanation:
i saw that no one commented so i seached it and found the answer: 8,324,608
The answer is B. Have a nice day :)
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).
The answer is Pharyngeal Phase and Esophageal Phase stages of swallowing. In the pharyngeal phase, the bolus of food is pushed against the epiglottis, which closes the respiratory tract. The upper oesophageal sphincter relaxes and the bolus moves into the esophagus. In the oesophageal phase, the oesophageal sphincter closes when the bolus moves down and peristalsis action takes over to move the food down the oesophagus.
B. a new material is created
