Lymph nodes produce what substance that assists in immunity from disease?

1 answer:

3 0

The lymph nodes produce lymphocytes that assists in immunity from disease. These are one of the many types of white blood cells that is produced in the body. These are being produced by the lymph nodes wherein it protects the body from infection. Lymphocytes are classified into NK cells, T cells and B cells. When the levels of these cells are not in the normal zone, then most likely infection is present. When it is high, it is a sure sign that a viral infection is present. When it is low, the body would become susceptible to infections. So, it is very important that the concentration of these cells in the body is kept on the normal range.

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You examine an epithelial cell (skin cell) and notice the chromosomes are visible however it appears there are two nuclei in the

krek1111 [17]

Answer:

The best explanation if we observe an epithelial cell with chromosomes are visible and two cell nuclei is that the cell has just gone through telophase but not cytokinesis (option b).

Explanation:

A somatic cell, when found in mitosis, exhibits the chromosomes distributed in both poles and the outline of two nuclei in the telophase phase, just before cytokinesis.

In mitotic telophase:

Chromatids, which are chromosomes, are found in the cell poles.
It initiates the formation of the nucleus membrane.
The chromosomes begin to turn into chromatin.
Disappearance of the mitotic spindle, duplication of organelles and cytoplasmic invagination.

The division and differentiation of the nuclei in telophase is called karyokinesis. Later, cytokinesis occurs, where the daughter cells are separated.

The other options are not correct because:

a and d. In the other phases described, S and G1, no chromosome distribution is observed at the poles.

c. A somatic cell does not experience meiosis.

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When an ecosystem loses biodiversity how does it change

shepuryov [24]

Answer:

A decrease in biodiversity causes a decrease in ecosystem stability, because a change to one organism will have a greater impact on the entire ecosystem. With greater biodiversity, the loss of one type of organism could be moderated by the adaptation of other organisms to fill its role.

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Why do you think bright feathers make a male duck a desirable mate?

lesya692 [45]

In competition, males use feather color to warn potential rivals that they occupy a piece of territory.

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Health professional work in nail is called

Hoochie [10]

Answer:

Nail technician

Explanation:

I don't really understand the question but i hope that helped.

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2. When diffusion has reached equilibrium, we say that

madam [21]

Answer:

See Below.

Explanation:

The key word here is net. The net movement has reached zero when a system is in equilibrium but there are still motion's going back and forth due to statistics and just random brownian motion.

Think of it this way, if there are 100 people walking forwards in a crowd but 2 are moving against the crowd, the net movement is still forwards because the bulk of people are going in that direction. However, there are still 2 people moving against.

Same here, if we are talking about a diffusion, let's say in the case of osmosis, if most of the solute is moving across a membrane then we'd say its net direction is that way but that doesn't mean that there aren't processes happening in the other direction. Water molecules in osmosis mostly diffuse, chemically speaking (because you can say this biologically in a different way), from the probability of water molecules colliding with each other and passing the membrane so even if there is a net movement in a certain way their random motion can make them go to the other side just as well. If the fact that motion stops at equilibrium were the case a lot of systems, both chemical and biological, would not exist as we know it.

Think net = bulk NOT total or entire.

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