(1) ca2+ enters axon terminal. (2) ligand-gated ion channels open in postsynaptic membrane. (3) neurotransmitter binds to postsynaptic receptor. (4) action potential reaches axon terminal of presynaptic neuron. (5) neurotransmitter released by exocytosis.

These are the events occurring at synapse for the transmission of nerve impulse across the synapse from one neuron to another. The order of events is as follows: 4 - 1 - 5 - 3 - 2.

Explanation:

The correct order of events during the transmission of nerve impulse from one neuron to another is as follows:

4) Action potential reaches axon terminal of presynaptic neuron.

1)  Ca2+ enters axon terminal.

5) Neurotransmitter released by exocytosis.

3) Neurotransmitter binds to postsynaptic receptor.

2) Ligand-gated ion channels open in postsynaptic membrane.

- The transmission across the synapse can be either electrical or chemical. Here is this case we are talking about chemical transmission.

- When the action potential reaches the axon terminal, the voltage gated calcium channels open and there is influx of calcium from the synapse.

- This causes the fusion of synaptic vesicles with the membrane and exocytosis of neurotransmitter.

- These neurotransmitters bind to the receptors on post synaptic membrane and cause opening or closing of voltage gated channels.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.