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3 years ago

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:

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when an intestinal cell ingests substances inside very small vesicles that can only be seen with an electron microscope, this is

crimeas [40]

An intestinal cell ingests substances inside very small vesicles that can only be seen with an electron microscope, this is - pinocytosis.

Pinocytosis s a process by which the cell ingests substances that are able to dissolve along with fluids by folding the cell membrane and creates small vesicles around it.

It ingests pathogens, nutrients, and essential cell fluid into the cell.
Also called cell drinking as ingest all substances dissolve in the fluid.
It is a mode of endocytosis, a process that moves molecules, substances into the cells through vesicles.
Intestinal cells use pinocytosis to ingest substances inside very small vesicles

Thus, the correct process is - pinocytosis.

Learn more about endocytosis:

brainly.com/question/14537096

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