1. Action potential reaches the axon terminal and depolarizes it.
2. Depolarization opens voltage-gated calcium channels, enabling influx of Ca into the neuron.
3. Calcium binds to specialized proteins on vesicles (containing pre-made acetylcholine) and triggers them to fuse with the neuron membrane at the synapse.
4. Exocytosis of acetylcholine into the synaptic cleft occurs.
5. Acetylcholine diffuses across the synapse and binds to nicotinic receptors on the end plate of the myocyte.
6. Activated nicotinic receptors, themselves ion channels, cause cation influx into the myocyte and generate an end plate potential. This eventually gives rise to the full depolarization within the myocyte that enables contraction.
Answer:
Si, esto es lo que se conoce como circulacion menor.
Explanation:
La sangre cumple un recorrido en el corazon a la cual se la llama circulacion mayor, una vez que se continua su camino hacia los pulmones ahi ya pasa a ser circulacion sanguinea menor.
Estas circulaciones estan sumamente coordinadas y tienen un orden ritmico, con un unico fin, que es oxigenar la sangre que se recolecta de todo el organismo.
Es asi como la sangre que viene con CO2 entra a los pulmones posterior a la eyeccion cardiaca y cumple con el proceso de homeostasis en el alveolo y se oxigena.
The correct answer is C
Hope this helped :)
Answer: a. Excesses are eliminated from the kidneys.
Explanation:
A fat-soluble vitamin can be dissolved in fats and oils. They are absorbed along with fats in the diet from the intestinal lumen using the same mechanisms used for absorption of lipids. Upon absorption, <u>these vitamins enter the lymph vessels</u> before making they go into the bloodstream. In most cases, fat-soluble vitamins must be coupled with a protein in order to be transported through the organism. <u>This means they are solubilized and transported by carrier proteins </u>to exert their actions.
By last, since fat-soluble vitamins can not be dissolved in water,<u> they are not readily excreted. So they can accumulate in fatty tissues</u> to toxic levels if taken in excess.
Answer:
B
Explanation:
An ecosystem can contain many habitat.
