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joja [24]
1 year ago
10

__________identify antigens and then multiply and trigger the production of other kinds of immune cells.

Biology
1 answer:
solong [7]1 year ago
5 0

<u>Helper t-cells</u> identify antigens and then multiply and trigger the production of other kinds of immune cells.

<h3>What are helper T-cells?</h3>

Helper T-cells are one of the main types of immune cells. They detect infections and activate other immune cells to fight the infection.

Your thymus develops helper T-cells. The thymus is a small gland in the front of your chest. The other types of T-cells include:

  • Cytotoxic T-cells, which fight infections.
  • Regulatory T-cells, which regulate or suppress other immune cells when needed.
  • NKT-cells, which can enhance immunity in general.

<h3>What are the subtypes of helper T-cells?</h3>

When helper T-cells detect an infection, they form into one of two subtypes:

  1. TH1 helper cells release a molecule that activates a type of cell called a macrophage. Macrophages are specialized cells that help eliminate foreign substances from your body. TH1 cells also activate cytotoxic T-cells.
  2. TH2 helper cells release molecules that activate B-cells. B-cells create antibodies. They also release cells that cause coughing, sneezing or diarrhea to help your body get rid of foreign substances. This group of T-cells helps generate allergy antibodies.

Learn more about helper T-cells

brainly.com/question/14902979

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a volcano made from particles and globs of lava thrown from a single opening in the crust is a _______ volcano. dome fault-block
babymother [125]
<span>Cinder cone or spatter cone !</span>
8 0
2 years ago
Cells must be alive to use energy and do work dose passive transport occur in a cell that is dead? Why or why not?
Orlov [11]

Answer:

<h3>Yes, Passive transport can occur in dead cells.</h3>

Explanation:

For passive transport to occur, a concentration gradient has to be formed across a permeable or semi-permeable membrane. If the cell membrane of the dead cell, which is a semipermeable membrane, is intact and a concentration gradient has formed on both sides, passive transport can occur.

A concentration gradient is the difference in the concentration of solute molecules  across the membrane. Passive transport will allow solute molecules to travel from the higher concentration of the solute to the lower concentration across a membrane till equilibrium is reached, that is, both the sides of the membrane has equal concentration of the solute.

The transport of the solvent can occur as well, from higher concentration to lower concentration.  

6 0
3 years ago
The organisms that harness non-biological energy and convert it to biologically relevant/useful energy are called __ 1 __ _. The
mamaluj [8]

Answer:

The organisms that harness non-biological energy and convert it to biologically relevant/useful energy are called __<u>autotrophos or producers</u>_. The organisms that consume these are called _<u>herbivores</u>_ (it should end in -ores) which occur at the __<u>second</u>_ trophic level. The number of trophic levels that any ecological system will primarily dependent on the _<u>consumer</u>_ organisms.

Explanation:

 In the trophic web occurs energy transference through organisms occupying different levels in the chain. Each level feeds on the preceding one and becomes food for the next one. The first link is occupied by autotroph organisms, which are the producer. The following links are the consumers: herbivores are primary consumers and feed on producers. Carnivores are secondary consumers and feed on herbivores, and so on. The last links are the decomposers, microorganisms that act on dead animals degrading organic matter.  

Every link has an effect on the superior links and the immediately anterior link, meaning that whenever one of the links changes, the other ones will be affected.  

Autotrophs or producers synthesize inorganic substances, such as light, and turn them into organic matter according to their own needs. These organisms are photoautotrophs, such as plants, or chemoautotrophs. They occur at the first trophic level.

Heterotrophs are those incapable of producing their own organic matter, so they feed on producers, depending on them to get proteins and energy. In the trophic chain, heterotrophic organisms occupy the first, second, or third consumer level, after producers. These animals can be herbivorous, carnivorous,  omnivorous, hematophagous, ichthyophagous, and etcetera. All of them depend on autotrophic organisms.

In the particular case of herbivores, they occur at the second throphic level feeding on producers and being eaten by carnivores.

In general, most trophic chains are composed of 4 or 5 levels, depending on the number of consumers present, and the energy transference between levels.

8 0
2 years ago
PLEASE HELP You must design a valid experiment to show that there are microorganisms in the air. What would be your dependent va
Komok [63]
You can carry out a test , 
1- take a sample of the air in a test tube 
2-add limewater to the test tube 
3- result : if it turns milky/cloudy it has microorganisms 
4- reason: because every microorganism respires , and so it produces Carbon dioxide . 
and limewater is the test to show the presence of Carbon dioxide . 


6 0
3 years ago
The arrow is pointing to the?
seropon [69]
Hair follicles is the hair coming out of the subcutaneous layer
3 0
2 years ago
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