Which of the following best describes the difference in the...

Which of the following best describes the difference in the way B cells and T cells deal with invaders? a. B cells provide permanent immunity; T cells provide temporary immunity. b. $\mathrm{B}$ cells send out antibodies that bind to invaders; T cells directly engage the invaders. c. T cells handle the primary immune response; $B$ cells handle the secondary immune response. d. $\mathrm{B}$ cells are always ready "off the rack" to respond to an invader; T cells must be primed.

Transcript

00:01 This question is asking us to identify the roles of b cells and t cells and to choose the answer choice that best describes these rules.

00:10 So i have the answer choices written down here at the bottom, and we'll start with a quick review of what b cells and t cells are.

00:20 So b cells are responsible for the humoral immune response, which is the defense against primarily bacteria and virus.

00:30 Present and body fluids.

00:33 B cells are the cells that will secrete antibodies into the blood and lymph, and these antibodies will mark invaders by binding to them, and the resulting antigen antibody complexes are easily recognized for destruction and disposal by phagocytes.

00:49 Okay, so keyword here is going to be antibodies.

00:59 All right.

01:00 Now for the other part of this question, the t cells.

01:03 So the t cells are responsible for the cell -mediated immune response, which defends against infections inside body cells.

01:13 There's two types of t -cells.

01:15 There's helper t -cells and cytotoxic t -cells.

01:25 So helper t -cells trigger both the humoral and cell -mediated immune responses.

01:34 So they themselves do not carry out these responses, and instead, signals from help -er -tri -medied immune responses.

01:40 Per t cells initiate the production of antibodies as well as activate cytotoxic t cells.

01:48 These cytotoxic t cells are then the ones that will go and directly interface with infected body cells and destroy them.

01:58 So we'll put kill infected cells, body cells.

02:09 Okay, so let's take a look through these answer choices.

02:13 And see which one is the best fit.

02:18 So option a, permanent immunity and temporary immunity.

02:26 This doesn't really describe what b cells and t cells do.

02:31 B cells and t cells work together as part of the adaptive immune response.

02:37 They're not working independently.

02:41 So in that sense, breaking this question up like that doesn't really make sense because whenever you're having b cells, secreting antibodies, you know that helper t cells were participating in that.

02:52 So that alone kind of clues you off that this is maybe not the best choice.

02:59 They might be trying to talk about active and passive immunity, which is just describing how you acquire antibodies.

03:08 So active immunity, you make them yourself, passive immunity, you acquire them some other way.

03:14 And so passive immunity would be temporary...

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