Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD)

Jun 23, 2026 09:33 · 1:38 · English · Whisper Turbo · 2 & Kefluniañ

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

And so that's what we're going to talk about today,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

how you use antibodies and switch them up to deal with all

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

the various different types of pathogens that come your way.

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

And when I said switching things up,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

I really did mean that.

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

Your body makes five different classes of antibodies,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

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S… Speaker 1 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

M, G,

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S… Speaker 1 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

and E,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

which we like to remember with the simple mnemonic damage.

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

Do some damage will help you remember those five classes.

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

And so we're going to talk about each of those in this lesson.

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

Let's start with this M -shaped gate,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

which obviously represents IgM,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

or the mother of all antibodies.

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S… Speaker 1 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

Okay,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

it's not really the mother of all antibodies,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

but it is the first antibody produced by activated naive B cells,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

and it's really big.

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

It's also key in getting out there and fighting early on in an infectious process.

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

It's right there at the gate,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

ready from the get -go.

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

And IgM is a little special because it has a unique shape,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

and we've symbolized that with these falling snowflakes.

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

They represent the snowflakey pentameric or hexameric

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

shape of secreted IgM.

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S… Speaker 1 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

That said,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

IgM can also be seen as a monomer when it's working as a B -cell receptor.

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S… Speaker 1 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

As I said,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

IgM is also the first antibody produced.

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

It's early to the infection,

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

and so we'll have the sun rising here in the background to remind you that IgM is part of

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S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))

the early response to infection.

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