A neurotransmitter is a chemical substance that is released by a nerve fiber due to the presence of nerve impulses; it transport chemical information from one nerve to the other. A receptor refers to a protein molecule that is found on the cell membranes of every cell, it functions by responding in an appropriate manner to chemical signals that are coming from outside of the cell.
The relationship between the neurotransmitter and the receptor is that the neurotransmitter molecules typically bound with the appropriate receptors and bring about the expected changes in the targeted postsynaptic cell.
Answer:
The nervous system can cause the contraction of all three types of muscle tissue. For example, skeletal muscle contracts to move the skeleton, cardiac muscle is influenced as heart rate increases during exercise, and smooth muscle contracts as the digestive system moves food along the digestive tract.
Answer:
As there is no animation present, let me help you with the concepts generally.
Explanation:
Weathering can be described as the breakdown of large rocks, soils or minerals. For example, physical weathering is a type of weathering in which rocks are broken down without any chemical change being involved.
In Earth Sciences, erosion can be described as the movement of particles on Earth like rocks, soil etc from one part of Earth to another part. For example, rainfall might cause soil erosion.
Deposition can be described as the addition of rocks, soils etc on geographical parts of Earth.
Answer:
Hey there!
The correct answer would be B. Background extinctions are a normal part of stable ecosystems.
Hope this helps :)
