Answer:
b. 3,2,4,5,1
Explanation:
3. The action potential induces an electrochemical process that causes release of the acetylcholine.
2. Release of acetycholine into synaptic cleft is down an electrochemical gradient, i.e through diffusion and not requiring energy input.
4. Acetylcholine then binds and activates ligand-gated ion channels of the muscle fiber to open up.
5. Sodium ions will flow into the muscle generation an action potential that will culminate into contractions.
1. The enzyme acetylcholinesterase will breakdown any acetycholine not needed in the synaptic cleft.
A small cell, as it has a greater surface area to volume ratio therefore it more easily diffuses nutrients through the membrane and they get to the cell more efficiently.
Chemoautotrophs
Scientists believe CHEMOAUTOTROPHS were the first types of cells able to make their own food.
Chemoautotrophs are organisms that use inorganic energy sources for food, then it creates it own organic compound using ATP. The are primary producers in hostile environments like sea vents where they usually live.
D)Oxygen diffuses from alveolar sacs to blood in capillaries
