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PtichkaEL [24]
3 years ago
9

Doris’s heart suddenly races as a speeding car nearly collides with hers on the highway. which neurotransmitter is playing a rol

e in this response?
Biology
1 answer:
Radda [10]3 years ago
8 0
Is the <span>Norepinephrine, or noradrenaline. This is a neurotransmitter but it can also be called of stress hormone. This is the neurotransmitter responsible for the "flight or fight response". When we are faced with anything that's dangerous or scary, as it was with Doris, our body responds working faster because of this neurotransmitter: heart rate inscreases, as happened with Doris, breathing rate increases, pupils dilate, blood flow to skeleton muscles increases, and others...</span>
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Kara has 21 collectible buttons to sell. She sells the small buttons for $3 and the large buttons for $4, and earns a total of $
Andre45 [30]

Answer: x+y=21, 3x+4y=68

Explanation:

Here x represents the number of small button and y represents the number of large button,

And, According to the question,

Total number of button = 21

Thus,  x + y = 21

Also, She sells the small buttons for $3 and the large buttons for $4, and earns a total of $68

That is,   3x + 4y = 68

Thus, the system of equations that can be used  to calculate the number of large and small buttons sold are,

x + y = 21,  3x + 4y = 68

First Option is correct.


7 0
3 years ago
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AleksAgata [21]

Answer:

2

Explanation:

if sodium bonds with chlorine ionic bond formed

7 0
3 years ago
Freshwater fish are _____ with respect to osmoregulation.
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Based on my research, freshwater fish are a type of fish that has a higher concentration of salt than it's internal environment. With respect to osmoregulation, to fight this circumstance the freshwater fish has a kidney that makes the water to pass quickly.
8 0
3 years ago
The xylem is made from ________. the xylem is made from ________. elongated living cells intercellular spaces between cells tubu
lys-0071 [83]
The xylem is made from dead, hollow cells.
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Tracheids and vessel elements are the main components of xylem witch have a function to transport water. Those are elongated dead cells at maturity (without protoplast) with a thick, strengthened cellulose cell wall and a hollow lumen. Even though they are dead they still maintain a function, because are being protected by surrounding living cells.</span>
5 0
3 years ago
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There are more _______ vertebrae than any of the other types of vertebrae listed below.
Mars2501 [29]

Answer:

A. thoracic

Explanation:

It has 12 vertebrae

8 0
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