Which is NOT true of memory cells? (a) They are part of a secondary response. (b) They are part

Which is NOT true of memory cells? (a) They are part of a...

Key Concepts

Natural Killer Cells

Natural killer (NK) cells are a component of the innate immune system and function by directly targeting virally infected cells and tumor cells. They are distinct from adaptive immune cells like memory cells, as they do not possess antigen-specific receptors nor contribute to immunological memory.

Immunoglobulin Isotypes

Immunoglobulin isotypes, such as IgM and IgG, are classes of antibodies produced by B cells. Memory B cells are typically associated with the production of IgG antibodies upon antigen re-exposure, which are more effective in providing long-term immunity compared to the initial IgM response.

Memory Cells

Memory cells are long-lived lymphocytes that form after an initial immune response and reside in the body to provide a rapid and robust response upon re-exposure to the same antigen. They are a fundamental component of the adaptive immune system, responsible for immunological memory.

Secondary Immune Response

The secondary immune response is the enhanced reaction of the immune system upon encountering an antigen for the second time, characterized by a faster and stronger response due to the presence of memory cells that were generated during the primary response.

Anamnestic Response

The anamnestic response refers to the rapid and augmented immune response triggered by the reactivation of memory cells during a secondary exposure to an antigen. This enhanced response is a hallmark of adaptive immunity and is the basis for the effectiveness of vaccines.

Transcript

00:01 Okay, in order to answer this question, we have to talk about memory b cells.

00:08 Okay, first, memory b cells are a type of b lymphocytes that form part of the adaptive immune system.

00:24 Okay, these cells are going to develop within the germinal centers of the secondary lymphoid organs.

00:30 And these memory cells are going to circulate in a quiescent state, okay? in quiescent state, and usually, sometimes for decades.

00:51 And what is the function of this memory cells? well, let's suppose it's a pathogen.

00:56 Okay, and this is the primary infection or the first time you're infected by this pathogen.

01:01 So after you get infected by this pathogen, there is going to be production or activation of the pathogen.

01:06 Your immune system where there are going to be some cells that are going to kill or destroy these bacterial cells.

01:16 For example, this is a bacterium.

01:19 So some cells are going to be specialized to kill infected cells and also bacterial cells.

01:25 But there are some other cells that are going to be called memory cells, for example, memory b cells and the function of them is to recognize or to remember this infection for subsequent or for future infections by the same by the same pathogen okay so what is the function of memory cells so when they are produced after primary infection they are going to be circulating in the blood and when there is a secondary or a subsequent infection by the same pathogen this memory b cells are going to say okay i remember or i know this pathogen from past infection.

02:08 So i know what we did to kill it.

02:12 So we're going to do the same...

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