What is the sequence of defense for fighting off pathogens

2 answers:

8 0

When a pathogen comes in contact with your body, it has to breach the first line of defense to get inside. Your skin and mucus membranes are the main barrier here. Mucus traps the pathogens, and then is forced out of your body when you cough or blow your nose. Your skin also secretes chemicals that have antiviral properties, killing viruses on contact. If the pathogens get through that defense, the next line is non-specific immunity cells that patrol your tissues engulfing pathogens. There are other cells that do this, like macrophages, but the dendritic cells are most important for activating the third line of defense in your body.

Dendritic cells reside in your tissues, waiting for an invader to arrive. When they do find one, they engulf it and digest it. After they do this, they select pieces of the invader called antigens and put them on their surfaces. The dendritic cells migrate back to lymph nodes, key locations in your body filled with immune cells. There, they show the antigens, called antigen presentation, to two types of lymphocytes, T-cells and B-cells, activating them for a full immune response.

dimaraw [331]2 years ago

6 0

A. Tears --> Fever --> Antibodies

Explanation: Google-I mean I know best for yall hehe....I searched it up on google. Oop.

You might be interested in

Two populations of birds stop interbreeding over time because they develop different song patterns. What type of isolation does

kap26 [50]

If two populations of birds stop interbreeding because of a difference in song patterns this would be described as behavioral isolation.

8 0

2 years ago

in a 3-point cross, crossovers that occur during the formation of which gametes can be scored using the phenotype of f2 progeny?

JulsSmile [24]

In gametes generated by F1 tri-hybrids and gametes produced by parents from true-breeding populations.

When non-sister chromatids of homologous chromosomes exchange genetic material during meiosis, novel allelic combinations are created in the daughter cells. The locations of three genes in the genome of an organism are identified using a three-point cross. A homozygous recessive individual is crossed with a person who is heterozygous for three mutations, and the progeny's phenotypes are graded. When F1 progeny are self-pollinated, a 3:1 ratio of F2 progeny are created.

To konw more about homologous chromosomes please click on the link brainly.com/question/27258467

#SPJ4

7 0

3 months ago

Select the correct location on the image.

Andrej [43]

The column of mercury in the barometer is lowest when the barometer is ion location 4. Atmospheric pressure measured by the barometer decreases with an increase in altitude. Atmospheric pressure is caused by the column of air above the ground level at any given point on the earths surface thus an increase in altitude leads to a decrease in this column leading to a decrease in atmospheric pressure.

5 0

2 years ago

Read 2 more answers

Which statement correctly describes the structure of a centriole? A) 3 groups of 9 microtubules B) 4 groups of 6 microtubules C)

amid [387]

The right answer is D) 9 groups of 3 microtubules

Centrioles are the constituents of a so-called centrosome structure: every animal cell has a centrosome, which is made of two centrioles and which together form a functional unit. A centriole consists of nine triplets inclined microtubules, surrounded by a number of proteins.

8 0

2 years ago

When food moves through the esophagus, the muscular contractions are wave-like. nutrients are absorbed in the esophagus. skeleta

sveticcg [70]

The answers are;

The muscular contractions are wave-like

The muscular contractions are entirely involuntary

This action is called peristalsis. It is powered by the expansion and contraction of the smooth muscles present in the esophagus. It is controlled by the sympathetic activity of the autonomic nervous system hence the movements are involuntary.

8 0

2 years ago