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
SOVA2 [1]
3 years ago
13

What is the earliest stage of prenatal development at which a rudimentary heart beat can be identified?

Biology
2 answers:
MatroZZZ [7]3 years ago
3 0

Answer:

From the fifth week of pregnancy, its possible to identify the heart beat.

Explanation:

     In the third week of pregnancy the heart of the fetus begins to form. For this process, two tubes come together and give rise to five structures: two bulbs, a ventricle, an atrium, and a venous sinus. All this gives rise to the heart tube that, in the fifth week, divides into cavities. This is about the eighth week when the heart is ready.

   The heartbeat is noticeable by ultrasound. From the fifth week, on transvaginal ultrasound, depending on the sensitivity of the device, it is possible to hear the heart of the baby. In most such exams you can only hear the baby's heart from 6 and a half weeks.

   

Elina [12.6K]3 years ago
3 0

Answer:

The germinal stage which begins at conception and last for 2 whole weeks. The embryonic is the second stage and lasts for 6 whole weeks. The last stage is the fetal stage and last two months.

Explanation:

You might be interested in
True or false: The heart myocardium is nourished primarily through the diffusion of nutrients from the blood in the heart chambe
lesya692 [45]

It is false that the heart myocardium is nourished primarily through the diffusion of nutrients from the blood in the heart chambers.

<h3>Heart Myocardium?</h3>

Heart Myocardium is also called Cardiac muscle is a specialized type of muscle tissue that cover the heart. The cardiac muscle ontracts and relaxes nvoluntarily and it help to keep the heart pumping blood to the body.

Therefore, It is false that the heart myocardium is nourished primarily through the diffusion of nutrients from the blood in the heart chambers because it is nourished by blood flow through the coronary arteries.

Learn more about Myocardium from the link below.

brainly.com/question/1373449

4 0
2 years ago
7. How did scientists determine the age of the ocean floor?
lara31 [8.8K]

Answer:

a. By Calculating magnetic reversals.

Explanation:

They determine the age of the ocean floor by examining magnetic fields in the planet Earth.

6 0
2 years ago
Read 2 more answers
It's 3 questions this time.
Vinvika [58]

Answer: 3.  in the icecaps. 2. temperature. 1.  the second one

Explanation:

6 0
3 years ago
- Explain why the concept of evolution is a Scientific Theory.
Anni [7]

Answer:

The theory of evolution basically serves to explain the biological evolution of living beings. The theory of evolution basically serves to explain the biological evolution of living beings. This results in the appearance of new species different from the previous ones.

6 0
3 years ago
Read 2 more answers
Increased force output of the synergists for hip extension to compensate for the weakened gluteus maximus is an example of which
olga_2 [115]

Answer:

b. Synergistic dominance

Explanation:

The stabilizing muscles will always be <u>synergistic</u>, since only from the synergies (hence the term synergist) that arise from joint work is efficient and controlled movement possible. However, not all synergists will be stabilizers. Stabilizer will be one that, thanks to the geometric arrangement of its fibers, will have the ability to maintain alignment in the joint and stable the axis of rotation.

In the case of knee extension, we would have as stabilizers all the antagonists who, because the flexion axis is virtual and not physical, must maintain the stability of said axis. If the axle were physical, such as the wheel in a horse carriage, or on a skateboard through the bearings, the antagonistic muscles would not be necessary for this purpose, because the fixed axis would maintain the position. Since the joints of living beings do not have a fixed physical axis, it is the muscles themselves, specifically the antagonists, who must be responsible for maintaining the stability of the joint creating a virtual axis on which rotation occurs.

3 0
3 years ago
Other questions:
  • The _____ is the area near the center of the retina where there are no rods and no cones.
    12·2 answers
  • Can anyone help me with this?
    11·1 answer
  • This graph shows that bird ranges in the winter have been shifting northward over several decades
    5·2 answers
  • Requirements for ______ increase by 50% during pregnancy. rev: 03_07_2017_qc_cs-81797
    11·1 answer
  • What are the two requirements for something to be matter
    15·2 answers
  • People with type _______ diabetes have an autoimmune disease.
    12·1 answer
  • Human red blood cells contain 0.9% sodium chloride as a component of their cytoplasm. What would happen if an IV solution contai
    15·1 answer
  • When a plant is not strong enough to support its own weight what is most likely the problem
    15·1 answer
  • Ways of transmission of coronavirus from infected person to others?
    7·1 answer
  • Why is the greenhouse effect on Earth not as drastic as on Venus? (1 point)
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!