Question
Asked Nov 11, 2019
46 views

Can I get clarification on the three lines of defense and the cells that take place in each group? (ex. b cells and t cells, cell-mediated and humoral immunities...etc)

check_circle

Expert Answer

Step 1

The immune system of a human body is the responsible for defending the individual from any harmful agent. The lymphatic system is part of immune system which is composed of lymphatic organs, lymphatic nodes and lymphatic vessels.

Step 2

Immune system is primarily divided into two types, the innate immunity and the adaptive immunity. On one hand when innate immune system acts in a non-specific manner, adaptive immune system on the other hand, acts in antigen specific manner and has memory of each encounter.

Innate immune system comprises two line of defenses.

The first line of defense is the chemical and physical barrier that includes lining the openings of body with layers of cilia, hair, mucus, skin or expelling out the microorganisms using mechanisms like vomiting, defecation or urine. Chemical barriers of body include lining the inner or outer layer of an organ with different chemical components. The components of chemical barriers include hyaluronic acid, sebum, acidity, saliva, gastric juices and lysozyme.

The second line of defense include destroying the pathogens in a non-specific manner that include phagocytic cells, inflammation and fever. The phagocytic cells include ingesting and destroying the microbes. The mechanism of inflammation works by bringing white blood cells at the sit...

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Biology

Immunology

Related Biology Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: Which of the following organelles produces and modifies polysaccharides that will be secreted by a p...

A: Prokaryotes are unicellular organisms that lack membrane bound organelles. They are of two types; ar...

question_answer

Q: What are the two types of fermentation and what are the products of each type of fermentation? Lastl...

A: Fermentation can be defined as a significant way to make ATP without oxygen. This process requires g...

question_answer

Q: The law of segregation of chromosomes arises due to events in _________.   A. Mitosis and meio...

A: According to Mendel’s law of segregation, a diploid organism contains two alleles at each genetic lo...

question_answer

Q: How do actin and myosin interact in a sarcomere to bring about muscle contraction? What roles do ATP...

A: Muscle contraction is the contraction of contractile units of muscle fiber or sarcomere, in response...

question_answer

Q: What is the role of plasmids in the recent occurrence of bacterial resistance to antibiotics

A: Plasmid is a circular piece of DNA with the capability to replicate independently within the host an...

question_answer

Q: What are the primary, secondary, and tertiary structures of DNA and RNA defined as?

A: DNA and RNA are the genetic material present in living organisms. Generally, the DNA appears as the ...

question_answer

Q: What are wo important intermediate molecules of both Glycolysis and Calvin Cycle?

A: Glycolysis is a catabolic process in which hexoses are oxidized to pyruvate molecules. Calvin cycle ...

question_answer

Q: What is alternative splicing of pre-mRNAs?

A: When a single pre- mRNA is spliced in more than one way to produce two or more than two mature mRNAs...

question_answer

Q: Natural selection is dependent on several factors, including the ability a population to survive and...

A: Natural selection:It can be defined as an evolutionary mechanism by which the organisms that are wel...