1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
SashulF [63]
2 years ago
5

What differences between physical and chemical barriers​

Biology
2 answers:
Step2247 [10]2 years ago
5 0

Answer:

Mechanical barriers — which include the skin , mucous membranes , and fluids such as tears and urine — physically block pathogens from entering the body. Chemical barriers — such as enzymes in sweat , saliva , and semen — kill pathogens on body surfaces.

Vesnalui [34]2 years ago
4 0

Answer:

The immune system comprises both innate and adaptive immune responses. Innate immunity occurs naturally due to genetic factors or physiology. It is not induced by infection or vaccination but is constantly available to reduce the workload for the adaptive immune response. The adaptive immune response expands over time, storing information about past infections and mounting pathogen-specific defenses. Both the innate and adaptive levels of the immune response involve secreted proteins, receptor-mediated signaling, and intricate cell-to-cell communication.

Explanation:

The skin, or epithelial surface, serves as the primary barrier to microbial entry into the body; skin peeling, drying out, and the skin’s acidity all serve to dislodge or kill foreign pathogens.

Orifices such as the eyes and mouth, which are not covered by skin, have other mechanisms by which they prevent entry; tears wash away microbes, while cilia in the nasal passages and respiratory tract push mucus (which traps pathogens) out of the body.

Many chemical barriers also exist once pathogens make it past the outer physical barriers; the acidity of the stomach ensures that few organisms arriving with food survive the digestive system.

Hope this helps!

You might be interested in
Scientists are concerned about the overuse of antibiotics because it could lead to certain diseases becoming ________________ to
kotykmax [81]

Answer:

Resistant

Explanation:

They wouldn't be worried about it being vulnerable to the drugs because that is what they want. For the disease to be affected successfully.

3 0
3 years ago
Read 2 more answers
Which macromolecules were present in the unknown solution?in the milk?
weqwewe [10]

Macromolecules contain large number of atoms. Milk contains both carbohydrates and proteins, because it gave a positive result upon the addition of Benedict’s solution which indicated an orange color. It means that there is a concentration of reducing sugars in milk.

6 0
3 years ago
Sugars are necessary for human cell function. Which of the following are human cells NOT
nirvana33 [79]

creating simple sugars from smaller molecules

Explanation:

The human cell is not capable of creating simple sugars from smaller molecules.

Simple sugars are the smallest unit of carbohydrates and are not created by the body. They are products obtained from food digestion.

  • Simple sugars cannot be hydrolyzed into simpler carbohydrate molecules.

When they combine together, they form polysaccharides which are complex carbohydrates.

These polysaccharides are complex carbohydrates.

learn more:

Carbohydrates brainly.com/question/10744528

#learnwithBrainly

6 0
3 years ago
What are the roles of the dna , the mRNA , the rRNA , and the tRNA in protein synthesis?
RSB [31]

DNA and RNA

Transcription.  During the process of transcription, an enzyme called RNA polymerase binds to DNA at a gene's promoter, then begins unwinding the DNA and making a complementary strand of RNA from the exposed DNA template. Depending on the gene being transcribed, the result can be a molecule of mRNA (messenger RNA), tRNA (transfer RNA), or rRNA (ribosomal RNA). Each type of RNA performs a specific function later in translation.  

rRNA  

Ribosomal RNA (rRNA) along with ribosomal proteins make up ribosomes, the "workbenches" on which polypeptides (proteins) are synthesized. It turns out that it is actually rRNA, and not a protein, in the large subunit of the ribosome that performs the peptidyl transferase function of linking amino acids together via peptide bonds. In eukaryotes, the genes coding for rRNAs are located in the nucleolus of the nucleus. A ribosome has 3 binding sites: an A (aminoacyl) site, a P (peptidyl) site, and an E (exit) site.  

mRNA  

The message carrying the information needed to make a particular polypeptide exists in the mRNA molecule. It binds with a ribosome and the ribosome starts reading it one codon - 3 consecutive mRNA bases - at a time. Each of the possible 64 codons codes for a particular amino acid, or for a release factor (in which case it is a STOP codon). So the order of bases in the mRNA specifies the order in which amino acids are linked together to form a polypeptide.  

tRNA  

A tRNA molecule has 2 main sites. At one end it has an amino-acid attachment site and on the opposite end it has a 3-base anticodon. An enzyme (an aminoacyl-tRNA synthetase) recognizes the type of tRNA and attaches the appropriate amino acid to it, at which point the tRNA is said to be charged. Charged tRNA molecules "bump into" the empty ribosome A site, but only if there is a complementary match between the mRNA codon associated with that site and the anticodon on the tRNA does the charged tRNA dock.


Hopefully, that's enough...

8 0
3 years ago
The magnetic field of Earth was most likely created by (2 points)
kvv77 [185]

Answer:

B

Explanation:

6 0
3 years ago
Other questions:
  • How does transferring energy into a container of magnetic marbles affect the speed by shaking the container gently?
    10·1 answer
  • What is a problem associated with LEED Certified buildings?
    11·1 answer
  • Explain how the structure of an enzyme makes that enzyme specific
    13·1 answer
  • I need help!!! Please!!!!!
    10·1 answer
  • Which structure is often modified to attract pollinators?
    9·1 answer
  • Scientists compare two different plant species. In species A, the leaf color is controlled by two alleles. In species B, leaf co
    12·2 answers
  • Genetics Problems (ABO Blood System) The chart below lists the blood phenotypes of 8 individuals. Use the information in the cha
    11·1 answer
  • The Punnett square above shows a cross between two sweet pea plants in Mendel's greenhouse. Both parents have blue flowers (Bb).
    6·1 answer
  • The cell membrane is a responsible for maintaining ___, a stable internal environment
    8·1 answer
  • Explain how the model of inheritance for the orange fur trait causes
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!