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romanna [79]
2 years ago
10

In angiosperms, a zygote and endosperm form as a result of

Biology
1 answer:
maks197457 [2]2 years ago
4 0
The answer of the first question is double fertilization !!! I don't get the second question so.... comment if you have that question !!!
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Which hormone does the sympathetic nervous system release to increase heart rate.
sertanlavr [38]

The sympathetic nervous system releases hormones known as catecholamines which increase the heart rate.

<h3>What is a heart rate? </h3>

it is the number of contractions of the heart per minute.

<h3>What are catecholamines?</h3>

These are the neurotransmitters that have a catechol and a side chain that is an amine.

<h3>Which catecholamines are released by the sympathetic nervous system?</h3>

Epinephrine and norepinephrine are the catecholamines that are released by the sympathetic nervous system to increase the heart rate.

<h3>Where are these hormones released?</h3>

These hormones are released in the blood.

<h3>How does this hormone increase the heart rate?</h3>
  • "These hormones are released at the neuromuscular junction of the cardiac nerves."
  • "They shorten the repolarization period."
  • This speeds up the rate of depolarization and contraction and thus the heart rate is increased.

To learn more about sympathetic nervous system, hormones and heart rate here,

brainly.com/question/1155838

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2 years ago
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Wewaii [24]
A. and B. Hope this helped
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A bag of sand and a bag of feathers can have the same density if they have different:
Black_prince [1.1K]
Volumes.

If you put equivalent volumes in a bag, where both weigh the same, the density might get equal.


Hope it helped,

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He transfer of pollen from the male reproductive structure to the female reproductive structure is called
yarga [219]
The answer is pollenation 
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Gravitational pull comes from the core. How rotated u are won't matter, but how far u are from the core will matter.
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