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 speakers
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0:07
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
0:13
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.
0:15
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,
0:18
S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))
I really did mean that.
0:19
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))
D,
0:23
S… Speaker 1 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))
A,
0:23
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,
0:25
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.
0:28
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.
0:31
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.
0:34
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,
0:36
S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))
which obviously represents IgM,
0:38
S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))
or the mother of all antibodies.
0:40
S… Speaker 1 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))
Okay,
0:41
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,
0:42
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,
0:46
S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))
and it's really big.
0:48
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.
0:52
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,
0:53
S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))
ready from the get -go.
0:55
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,
0:58
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.
1:01
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
1:05
S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))
shape of secreted IgM.
1:07
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.
1:12
S… Speaker 1 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))
As I said,
1:14
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.
1:16
S… Speaker 2 (Antibody Classes _ Their Functions in Immunity (Part 1) _ Sketchy Medical _ USMLE Step 1(720P_HD))
It's early to the infection,
1:17
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
1:21
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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