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Umnica [9.8K]
3 years ago
13

Why is it possible to catch a cold many times?

Health
2 answers:
babymother [125]3 years ago
6 0
The answer is A since there are a lot of different strains of cold viruses that cause the same symptoms
dimulka [17.4K]3 years ago
5 0

Answer: A, they separate divide and mutate repeatedly.

Please brainliest...

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Norepinephrine is released from ________ nerves, causing heart rate to ________.
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Norepinephrine is released from sympathetic nerves, causing the heart rate to increase to higher values.

<h3>What is Norepinephrine?</h3>

Norepinephrine is a neurotransmitter (i.e., a chemical messenger) which is well known for sending information to the brain in order to increase alertness during some particular situation and also serve to constrict blood vessels.

In conclusion, norepinephrine is released from sympathetic nerves, causing the heart rate to increase to higher values.

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