The diagram shows the heart of a bird.



What is the function of the structure labeled Y?

to keep oxygen-rich blood and oxygen-poor blood flowing
to filter waste materials from oxygen-poor blood
to filter waste materials from oxygen-rich blood
to keep oxygen-rich blood and oxygen-poor blood separate

Answer:

In adult organisms the regenerative capacity of certain organs or tissues can be limited, resulting in an important clinical challenge for physicians and scientists [1-3].

Regeneration involves the capacity for renewal or recomposition of tissues, organs or even organisms, after considerable physical injury or damage, resulting from pathologies, tumors, congenital diseases or traumas, for example. As a consequence of tissue regeneration, both the composition and the tissue properties are restored, and the newly formed tissue is highly similar to the original tissue. The regenerative capacity is directly related to the presence of stem cells or progenitor cells, which are capable of proliferation and differentiation [4,5]. Tissues that maintain a high proliferative capacity, such as the hematopoietic system, have regenerative capacity even in adult organisms [6].

Cell proliferation occurs in repair processes in general, accompanied by intense production of extracellular matrix, with large amounts of collagen, resulting in the formation of fibrous tissue to occupy the injured area. Although there is lesion filling, both the composition and the tissue properties are different from the original tissue, and the tissue organization pattern is not restored, leading to an altered performance of its functions [2]. Skin healing processes with the presence of scars are examples of tissue repair [3].

Besides the natural processes of regeneration and repair, it is possible, through medical intervention, to fill lesions with natural or synthetic materials, aiming at the recovery of the compromised area, and conferring certain properties to the tissue, avoiding, for example, exacerbation of the initial lesion or the evolution of degenerative processes [1,7].

The three approaches can be used in tissue engineering, targeting regenerative medicine, as they allow the recovery of compromised areas in different degrees. However, the primary objective is regeneration, recomposition of the original tissue and resumption of the biomechanical and molecular properties, with the normal performance of their functions [1,7-8].

Tissue regeneration involves cell recruitment, growth, proliferation and differentiation, with the latter representing a crucial stage for the success of regeneration, avoiding the formation of fibrous tissue characteristic of the repair [9-12]. Tissues with greater regenerative capacity, such as the skin and liver, intrinsically present cells able to migrate to occupy the affected region, and the same cells maintain the proliferative capacity, enabling occupation of the lesion [3]. In other tissues the regenerative capacity is even more impaired. In the cartilage, for example, the cells remain embedded in the extracellular matrix, and the absence of blood vessels inhibits the presence of other types of component cell in the tissue; even the cell migration and proliferation processes are compromised. In general, regeneration and repair processes do not occur naturally in these cases, requiring surgical intervention to stimulate the subchondral bone marrow, thus enabling the presence of cells capable of tissue repair in the compromised area [13]. Other scientific techniques and methodologies seek alternatives to enable the processes both of repair and of tissue regeneration [9-12,14-16].

Anyhow the final stage of the abovementioned processes, cell differentiation, is critical. An understanding of the mechanisms that lead to the differentiation process in adult organisms allows the proposition of improvements in existing technologies and of alternatives geared towards the optimization of guided tissue regeneration processes, in regenerative medicine.

Answer:

C

Combine B (above) and b (left) so Bb

Answer:

Properties of Life. All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing.

Explanation:

Answer:

similar anatomies and embryo

Explanation:

evidence of evolution include

fossil records

comparative anatomy

Answer: cell wall and lysosomes

Explanation:

Answer:

Your choices are all correct!

Answer:

Your are right the correct anwsers are

Explanation:

hope this helps you :)

Answer:B

Explanation:

Yes - convection explains why the colder and denser waters sink and why the warmer, less dense waters rise.

Answer:

Yes - convection explains why the colder and denser waters sink and why the warmer, less dense waters rise.

Explanation:

took the thingy

Answer:

dicot

Explanation:

because when the plant is cut horizontally, the central becomes dicot

Answer:

Genes

Explanation:

Answer:

meisios is the correct answer

Answer:

I don't know I'm sorry I will tell you another answer asks me to

The type of evidence that scientists use to infer ancestry includes morphological, molecular, and embryological evidence, and the fossil record.

Evolution can be used to describe descendence from a common ancestor of two or more species.

The presence of homo-logous structures is indicative of common ancestry between different species.

These homo-logous structures can be observed during the embryo stage of organisms and the observation of the fossil record.

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Answer:

B is the answer beacuse yeah sorry if wrong

Answer: adaptation would help a sped iss survive

Explanation:

Answer:

D. It produces gametes / sex cells.

Explanation:

Meiosis is a reductions division, so the source of the sex cells will produce the gametes, undergoing meiosis. The gametes will have half the number of chromosomes in a human body (23).

Answer:

think of it this way lol

Explanation:

In asexual reproduction, you are essentially producing clones of the parent.  There is no genetic variation between parent and offspring - think of mitosis.

In sexual reproduction, you have several chances for genetic variation.  The first occurs in meiosis 1, when homologous pairs line up and crossing over occurs.  Then in meiosis 2, different combinations of chromosomes (some from mother, some from father) could end up in the gamete cells.  Finally, when the gametes (egg and sperm/spore) come together in fertilization, that represents a brand new combination of chromosomes, and therefore alleles, than either of the parents had.

Answer:

Chlorophyll's job is to obsorb sunlight into the plant to be able to use the process of photosynthesis! Answer is C

.[tex] \huge \bigstar \mathfrak{ \fcolorbox{lime}{black}{ \red{ Asexual }}} \bigstar[/tex]

. Asexual

Answer:

Explanation:

question 1.

Aerobic Respiration — Takes place in the presence of oxygen.

Anaerobic Respiration –Takes place in the absence of oxygen.

question 2.

alcoholic fermentation and lactic acid fermentation.

question 3.

fluid part of the cytoplasm

Answer:

1) Aerobic Respiration =

Anaerobic Respiration =

2) The two types of anaerobic respiration are :

3) Anaerobic takes place in the cytoplasm of the cell.

Answer:

5) Both

6) Both

7) Animal

8) Both

Answer:

W w X w w

Explanation:

the square would fill with

Ww. ww

Ww. ww

They are divided into two separate kingdoms based on analysis of their

r RNA sequence.

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#SPJ2

Answer:

Bb= HE

bb-HOC

Ss=HE

SS=HOD

ss=HOC

Tt=HE

tt=HOC

TT=HOD

Explanation:

Answer:

A=T T=A G=C C=G

Explanation:

APPLES IN THE TREE

CARS IN THE GARAGE

Answer:

The orange is analogous to the Earth in having a relatively dense centre (mantle/core) and a much less dense skin (crust).

Answer:

A good anology is an oarnge because it has a thin/semi hard "crust" while the inside is much softer and bigger

Answer:

it gives a greater variety of crops