which of the following are protective barriers that are part of the body's immune system​

Answers

Answer 1
The skin, mucous membranes, and endothelia throughout the body serve as physical barriers that prevent microbes from reaching potential sites of infection. Tight cell junctions in these tissues prevent microbes from passing through.

Related Questions

3. Look at the image below, from the Gizmo. What must be true about this runner's graph?

Answers

Answer:

The graph of the runner must include the point (3.25, 25). [Students may also respond that the graph has a positive, or uphill, slope at that point. This is because the runner is facing forward in the image, so he must be running from left-to-right.]

About how much energy’s lost when an organism consumes another organism from a different trophic level?

Answers

Answer:

10 percent of energy is transferred to the next level of organisms so that would lead me to believe that 90 percent of the energy is lost.

In the periodic table, periods are_____rows.

Answers

Answer:

It's a row of chemical elements

Answer:

The rows on the periodic table are called periods. All the elements in a period have valence electrons in the same shell. The number of valence electrons increases from left to right in the period. When the shell is full, a new row is started and the process repeats.

Explanation:

Hope this helps! :)

5. Explain why a washing machine would be considered technology.

Answers

Answer:

It's technology because it does a certain service for you with less time wasted if you did it by hand.

Explanation:

What are the parts of an atom and the charges associated with each part?

Answers

Protons- these have a positive charge
Electrons-negative charge
Neutrons- neutral charge

What is the relationship between temperature and abundance life

Answers

Answer:

As average temperatures at the Earth's surface rise, more evaporation occurs, which, in turn, increases overall precipitation. Therefore, a warming climate is expected to increase precipitation in many areas.

The alignment causes a solar eclipse.

Answers

Answer:

Whats the question?

Explanation:

Answer:

the moon moves just far enough to cast a shadow to cause an eclipse.

Which is a nonrenewable resource

Answers

Answer:

coal,fossil fuels,nuclear energy i think

Answer:

Coal

Explanation:

Coal is a mineral found in caves so it cannot be made. That is why it is nonrenewable.

E.Coli is a type of prokaryotic bacterium that is present in contaminated food. Which describes where the genetic material is found


A.cytoplasm
B.Cell membrane
C.Ribosome
D.Nucleus

Answers

Answer:

Cytoplasm

Explanation:

In prokaryotes DNA is located directly within the cellular cytoplasm

In the E.coli, that is, a prokaryotic bacterium, the genetic material is found in the cytoplasm.

The genetic material in E.coli:

E.coli is a prokaryotic bacterium, and in all the prokaryotic cells, genetic information is carried on a single circular strand of DNA, which is either present in direct contact with the cytoplasm or is attached to the cell membrane.

In the prokaryotes, no enclosing membrane organelle is present, therefore, no nucleus is found. They comprises a concentration of DNA called nucleoid, which is not encircled by a nuclear membrane. Apart from this, no unique proteins are found attached with the molecule of DNA.

Thus, the correct answer is option A, that is, cytoplasm.

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PLS HELP ME ANSWER THIS AS FAST AS POSSIBLE!!!!!

Answers

Answer:

1st

Explanation:

1st answer im pretty sure, cuz cells are pretty simple, and in the end its the organism which makes up all of it

Which type of microscope allows you to look at 3D objects? *

compound
stereoscope
magnifying
simple

Answers

Answer:

Stereoscope

Explanation:

Stereo Microscopes enable 3D viewing of specimens visible to the naked eye.

Why is the polarity of water molecules and hydrogen bonding essential to adhesion and cohesion?

Answers

Cohesion and surface tension keep the hydrogen bonds of water molecules intact and support the item floating on the top. ... This is because the water molecules are attracted to the charged glass walls of the capillary more than they are to each other and therefore adhere to it.

Some properties like Polarity makes water a good solvent, cohesion helps in stick water molecule to itself while adhesion helps it to stick with other surfaces. Water have surface tension due to hydrogen bonding.

What are the difference between adhesion and cohesion ?

when two similar molecule come closer adhesion occur where as in cohesion two similar molecules face the force of attraction.

Adhesion is the force of attraction observed between the water molecules and xylem vessels while Cohesion is unrestrained among water molecules.

Capillary action and meniscus are the effects of adhesion while  Surface tension, meniscus and capillary action are the effects of cohesion.

The major forces responsible for adhesion are electrostatic or mechanical forces while Cohesion is the result of hydrogen bonding and Van der Waals forces.

A strong adhesion can lead to spread of liquid all over the surface while  cohesion forms water droplets.

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Mosquito repellent is sprayed on one arm and the other one is not sprayed. the number of mosquito bites is counted after 2 hours. what is the dependent variable and independent variable?

Answers

Answer:

who will answer this

Explanation:

what does selective permeability mean?

Answers

Selective permeability is a property of cellular membranes that only allows certain molecules to enter or exit the cell.


4. What would you use to measure the distance from your house to the
school? *
meters
centimeters
mimeters
kilometers

Answers

Answer:

kilometers

Explanation:

a kilometer equals 1,000 meters

c) Assume that the concentration of the solute molecules varies over time on both sides of the membrane and that the solute molecules continue to pass through the membrane even when the concentration gradient is the reverse of the gradient shown. Describe the environment in and around the cell, as shown in the diagram, and the mechanism of transport of the solute molecules. (3 points)

Answers

Answer:

Does the movement of molecules stop when the concentration of a solute is equal on both sides of a membrane?

The concentration of solute molecules on both sides of the membrane will vary over time, and the solute molecules will continue to pass through the membrane even when the concentration gradient is reversed.

The environment in and around the cell is constantly. The diagram shows a cell with a higher concentration of solute molecules on the inside than on the outside. This means that there is a concentration gradient, and the solute molecules will tend to move from the inside of the cell to the outside. This process is called diffusion.

The solute molecules can also move through the membrane by other mechanisms, such as facilitated diffusion and active transport. Facilitated diffusion is a process that uses proteins in the membrane to help the solute molecules move across the membrane. Active transport is a process that requires energy to move the solute molecules across the membrane.

The concentration of solute molecules on both sides of the membrane will continue to change over time. As the solute molecules move from the inside of the cell to the outside, the concentration of solute molecules on the inside of the cell will decrease. This will create a new concentration gradient, and the solute molecules will continue to move from the inside of the cell to the outside.

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please help me I dont have much time left ​

Answers

Answer:

Tissues are groups of similar cells that have a common function

An organ system is a group of organs that work together to do a job.

Explanation:

:)))

Answer:

tissues

Explanation:

The formula CaCI2 represents the compund___​

Answers

CaCl2 is Calcium Chloride

Draw and label a simple explanation model that shows where wood for building homes comes from.

Answers

Answer:

Forest.

Explanation:

Wood comes from forest which is used for building homes. The big source of wood are the forest present on hilly areas where woody plants such as pines are grown and cut down when they acquire a specific length and width. These woody plants are used to build houses and furniture etc. Wood has 20% higher strength to weight ratio than structural steel so that's why it is for building houses.

what causes a population to reach is carrying capacity

Answers

Answer:

Good well fare taxes and pricing

Explanation: not only that but benefits with health and cost for homes and the environment

Yeah exactly what that boy or girl said^^

Which two characteristics are used to classify stars on the Hertzsprung-Russell diagram?

size and density
density and composition
composition and temperature
temperature and absolute brightness

Answers

Answer:

Temperature and absolute brightness

Explanation:

The X-Axis of the diagram is heat, and it actually goes down in heat.

The Y-Axis is for brightness, and it works like a regular axis, meaning as it goes up, the number or unit of some sort, in this case luminosity, goes up.

Two characteristics are used to classify stars on the Hertzsprung-Russell diagram are temperature and absolute brightness

What is the  Hertzsprung-Russell diagram?

The Hertzsprung-Russel diagram or HR diagram is a graphical tool using a scatter plot used by astronomers to classify stars according to their:

luminositycolor temperaturespectral type

Here, The HR diagram plots as either

the temperature of the stars versus  the luminosity  OR the color of stars versus absolute magnitude.

Therefore two characteristics used to classify stars on the Hertzsprung-Russell diagram are temperature and absolute brightness(Luminosity)

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Leigh investigates the color of shells deposited on a beach as she walks along the coastline. She wants to know whether this variation in color is due to chance or if it is significant. Data was collected over a minimum 20 cm long region at four sites along the beach coast. Shells were categorized into four different shades, 1 being the lightest and 4 being the darkest. What is the mean number of shells collected?

Answers

Answer:

the data is QUANTITAVE because it includes data that are NUMBERS a CHI-SQUARE will be used ...

Explanation:

right on edge for ap bio

Answer:

slide 4 is 4.79

Explanation:

correct on ap bio edge 2021

An organic molecule will always contain
carbon
carbon and hydrogen
OO, H. and C
hydrogen

Answers

Answer:

carbon atoms

Explanation:

all organic molecules have carbon.

When magma reaches the surface of the earth, it is called​

plz help

Answers

Answer:

Lava

Explanation:

Answer:

it is called lava

Explanation:

What best describes the scientific process?

Answers

Answer:

B.

Explanation:

The scientific method follows a series of six steps in which it includes the one from observation to reaching a conclusion.

The statement that best describes the scientific process is that it is a way to answer scientific questions.

What is the scientific process?

The scientific process is a method of discovering knowledge about the natural world in the following manner:

making falsifiable predictions (hypotheses). testing them empiricallydeveloping theories that match known data from repeatable physical experimentation.

The scientific process involves the following steps:

Asking a questionDoing background researchConstructing a hypothesis. ...Testing of the hypothesis by doing an experimentAnalyzing the data and drawing a conclusion

The aim of the scientific process is to answer a scientific question or proffer solution to a problem.

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If you have an experiment in which there are 4 different groups, and the same variable is manipulated in all of them, is there a control group?

Answers

Answer:No

Explanation:I believe it is no due to the fact that the variable is being manipulated in all groups and in order to be a control groups the variable must remain the same or must not be manipulated.

hope this helps :)

When does the first quarter phase of the moon occur?
Select one:
a. three weeks after the new moon phase
b. one week after the full moon phase
c. two weeks after the third quarter phase
d. two weeks after the new moon phase

Answers

Answer:

l think

b. one week after the full moon phase

I don’t understand stand help me

Answers

Answer:

With what ive read I’m assuming its A

Explanation:

Which of the following leads to genetic variation in gene pools?
A. gene flow C. mass extinctions
B. isolation D. punctuated equilibrium

Answers

Answer:

b

Explanation:

Different chemical elements will create a different scattering of absorption lines in the spectrum of visible light. We understand the interaction of an atom with light and because of this we can predict where the lines should be and verify this in a lab this process is called

Answers

Answer:

Hydrogen emits and absorbs light at specific wavelengths, therefore if you're looking at a distant cloud that produces a certain spectrum

Explanation:

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Susan is buying three different colors of tiles for her kitchen floor. She is buying 107 red tiles, and three times as many navy blue tiles as beige tiles. If susan buys 435 tilea all together, how many tiles of each color does susan buy? identify and explain one effect of one intellectual innovation.HELP PLEASE A person who organizes productive resources to make goods and services is a(n).consumerentrepreneurO investor 9+ p =12 rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr Choose the word that best completes the phrase.Gloria no es una estudiante muy buena.estudia.O MuyO SiempreNuncaMucho i think its 3 or 1 i dont know Which of these relations are functions? "In order to be walked on, you have to be lying down." Brian WeirExplain what the quotation is saying in your own words. Includeexamples to support your explanation.ORState whether you agree or disagree with the quotation. Includespecific reasons as evidence to support your opinion. I dont understand this as you read, underline the uses of conceptual models. If the revenue function for a particular commodity is R(p) = 53p2 + 64p, what is the (linear) demand function q(p)? The Black Codes were: Can someone please help me? ... The crown upon your brows may flourish long,And that your arm may in your God be strong!O may your sceptre num'rous nations sway,And all with love and readiness obey!But how shall we the British king reward!Rule thou in peace, and our lord!Midst the remembrance of thy favours past,The meanest peasants most admire the last...- "To the Kings Most Excellent Majesty,"Phillis WheatleyHow does Wheatley's use of couplets relate linesto one another?o It creates pairs of lines.O It creates separate lines.o It creates pairs of stanzas.DONE Victoria is going to use a computer at an internet cafe. The cafe charges an initial fee to use the computer and then an additional price per minute of usage. It is known that the total charge to use a computer for 5 minutes would be $6 and that the additional rate per minute of use is $0.60. Write an equation for C,C, in terms of t,t, representing the total cost of using a computer for tt minutes at the internet cafe. how would you feel if you were samuel anointing saul as king? Diego says the constant of proportionality is 550 Andrew say is the constant of proportionality is 9 1/6 do you agree with either of them explain your reason solve for x, UV and TV HURRY PLS HELP ASAPWhich substances compose the backbone of DNA?sugars and lipidsphosphates and amino acidssugars and phosphateslipids and proteins How many Ethers were in existence at launch and why? 1. 21 million because they wanted to have more units than Bitcoin 2. 72 million because they couldn't make any less 3. 72 million because they needed to raise cash for its development 4. 21 million because they needed some to use on the testnet