1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
VikaD [51]
3 years ago
10

A muscle contraction usually begins when

Biology
1 answer:
shepuryov [24]3 years ago
7 0

Answer:

For a contraction to occur there must first be a stimulation of the muscle in the form of an impulse (action potential) from a motor neuron (nerve that connects to muscle). Note that one motor neuron does not stimulate the entire muscle but only a number of muscle fibres within a muscle.

Explanation:

You might be interested in
PLEASE HELP!!!! WILL BE MARKED AS BRAINLIEST
kondaur [170]
fertilization comes first
it is followed by cleavage which is the rapid cellular division which forms the blastula
then comes gastrulation where the 3 germ layers are formed.
followed by organogenesis which consists first forms the organs and then comes the specialization
Therefore your answer would be B
6 0
3 years ago
The dark areas of the Moon are called the terrae, and they are made of basaltic lava?
sasho [114]
A)TRUE...................................
5 0
3 years ago
Why does June and July have the highest rate of chemical weathering?
34kurt

It has the highest rate of chemical weathering because chemical weathering occurs much faster in hot, humid climates. This makes rain forests a target for <span>chemical weathering, and in hot seasons, the weathering skyrockets.</span>
3 0
3 years ago
Read 2 more answers
small group of 100 people decide to isolate themselves from the world and move to a small and remote deserted island. Out of thi
irina [24]

Answer:

Frequency of p = 0.684

Frequency of p = 0.316

Number of individuals with homozygous dominant (AA) = 47

Number of individuals with heterozygous (Aa)= 43

Number of individuals with homozygous recessive (aa) = 10

Explanation:

Out of 100 people, 10 have albino skin (aa)

So, the frequency of homozygous recessive individuals (q^{2}) is \frac{10}{100} = 0.1

Now, q will be

= \sqrt{q^{2} } = \sqrt{0.1} \\= 0.316

As per Hardy Weinberg's equation -

p + q = 1

Substituting the value of q in above equation, we get -

p + 0.316 = 1p = 1 -0.316\\p = 0.684

Now the frequency of homozygous dominant (AA) will be

p^{2} = 0.684^{2} \\= 0.467

Hence, out of 100 people 0.467 * 100 = 46.7 or 47 people are homozygous dominant (AA)

Like wise out of 100 people 0.1 * 100 = 10 people are homozygous recessive (aa)

As per As per Hardy Weinberg's equation-

p^{2} + q^{2} + 2pq = 1\\

Substituting the values in above equation, we get -

0.467 + 0.316 + 2pq = 1\\2pq = 1 -( 0.467+ 0.1)\\2pq = 0.433

So, out of 100 people 0.433 * 100 = 43.3 or 43 people are heterozygous (Aa)

7 0
3 years ago
In the movie they obtained DNA from different source, what were those sources? What other sources would be preferable? What sour
qaws [65]

Answer:

the answer is when people are doing stuff and they have a baby.

Explanation:

5 0
3 years ago
Other questions:
  • Viperfish hunt by attracting prey to their glowing bellies. This adaptation is most useful for the
    11·2 answers
  • It is estimated that _______________ of human DNA encodes protein. A) about fifty percent B) less than five percent C) more than
    10·2 answers
  • The three major types of rocks are igneous, sedimentary, and _____.
    14·2 answers
  • Which of the following statements regarding secretory protein translocation is NOT true? Hydropathy profiles are used to computa
    5·1 answer
  • Counting the rings on a tree will always tell you the exact number of years it has been alive.
    12·1 answer
  • Select the five cellular organelles that are part of the endomembrane system.
    10·1 answer
  • Manufacturing vaccine proteins in plants, or "biopharming," has several advantages over using chicken eggs for vaccine productio
    9·1 answer
  • Imagine you are at the top of a mountain looking down. As you hike from the highest elevation to the lowest elevation, you find
    12·2 answers
  • Which of the following is a characteristic of eukaryotes but NOT of prokaryotes?
    8·1 answer
  • Environmental catastrophes can cause changes to the Earth’s surface.
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!