Complement System Pathways and Functions

Complement System Pathways and Functions

Assessment

Interactive Video

Biology, Science

9th - 10th Grade

Practice Problem

Hard

Created by

Patricia Brown

FREE Resource

The video explains the complement system, a series of proteins in the blood that play a crucial role in immune responses. It covers the classical and alternative pathways, detailing how proteins like C1 to C9 interact to destroy pathogens. The classical pathway involves an antigen-antibody complex, while the alternative pathway directly binds to pathogens. Both pathways recruit phagocytes, tag pathogens for destruction, and form a membrane attack complex to eliminate threats. The video concludes with a preview of the next topic on T-cells and adaptive immunity.

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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary role of the complement system in the body?

To digest food

To regulate blood pressure

To assist in immune responses

To transport oxygen

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Where are complement proteins primarily produced?

In the liver

In the kidneys

In the lungs

In the heart

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What triggers the classical pathway of the complement system?

High blood pressure

Presence of water

Antigen-antibody complex

Direct binding to pathogens

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which complement protein is the first to bind in the classical pathway?

C3

C5

C1

C9

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the function of the C3a fragment in the complement system?

To split C5

To form the membrane attack complex

To bind to pathogens

To attract phagocytes

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the final outcome of the membrane attack complex formation?

Pathogen replication

Pathogen destruction

Pathogen mutation

Pathogen dormancy

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does the alternative pathway differ from the classical pathway?

It does not involve complement proteins

It begins with direct binding of C3 to the pathogen

It requires an antigen-antibody complex

It starts with C1

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