When Loewi triggered a nerve that affected a frog's heart rate, he was able to remove fluid from the region surrounding the heart, transfer it to another frog's heart, and subsequently affect that frog's heart rate as well.
<h3>What are Neurotransmitters?
</h3>
Neurotransmitters, which are organic compounds, play a major role in the language that neurons use to communicate with one another and with their final targets. Following electrical stimulation, these substances are produced and act on their particular receptors to start a response that can be as simple as a muscle contraction or as extremely complex as starting a chain reaction that eventually changes how the organism behaves. Neurotransmitters can have multiple functions; depending on where they act, they can be neuromodulators or, in some cases, neurohormones.
To know more about "Neurotransmitters", visit: brainly.com/question/26387085
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Answer:
b) The Nile River fertilized the soil along its banks.
Answer:
C. Critical
Explanation:
A non-directional hypothesis talks about how an independent variable has an effect on the dependent variable. The direction of the effect isn’t a definite one.
This form of hypothesis would entail the use of a critical test to ascertain its authenticity due to the effect not being a definite one. This means extra tests and caution are employed in this case.
This is why critical tests is the right choice.
