Match each type of defensive cell with its function or...

Match each type of defensive cell with its function or description. a. lymphocyte b. cytotoxic T cell c. helper T cell d. phagocytic cell e. $B$ cell f. memory cell 1. attacks infected body cells 2. secretes antibodies 3. white blood cell that engulfs cells or molecules 4. general name for B or T cell 5. initiates the secondary immune response 6. cell most commonly attacked by HIV

Match each type of defensive cell with its function or description.
a. lymphocyte
b. cytotoxic T cell
c. helper T cell
d. phagocytic cell
e. $B$ cell
f. memory cell
1. attacks infected body cells
2. secretes antibodies
3. white blood cell that engulfs cells or molecules
4. general name for B or T cell
5. initiates the secondary immune response
6. cell most commonly attacked by HIV

Key Concepts

Lymphocyte

Lymphocytes are a type of white blood cell fundamental to the adaptive immune system. They include both B cells and T cells, which are responsible for recognizing specific antigens and mounting targeted immune responses to pathogens and foreign substances.

Cytotoxic T cell

Cytotoxic T cells are specialized lymphocytes that identify and directly kill infected or cancerous cells. They are integral to cellular immunity because of their ability to destroy cells that harbor intracellular pathogens.

Helper T cell

Helper T cells are crucial coordinators within the immune system. They assist in the activation and regulation of both B cells and cytotoxic T cells, thereby amplifying the overall immune response, and are particularly significant as they are primary targets for certain viruses.

Phagocytic cell

Phagocytic cells, such as macrophages and neutrophils, form part of the innate immune defense. Their main function is to engulf and digest pathogens, dead cells, and foreign particles, serving as a first line of defense and linking to adaptive responses.

B cell

B cells are lymphocytes that primarily contribute to humoral immunity through the production and secretion of antibodies. These antibodies bind to specific antigens, marking pathogens for neutralization or destruction, and help in preventing infections.

Memory cell

Memory cells are long-lived lymphocytes that arise after an initial immune response. They enable a faster and more robust response upon subsequent exposure to the same pathogen, forming the basis of immunological memory and effective secondary immune reactions.

Transcript

00:01 This question asks us to match each type of defensive cell with its function or description.

00:07 So let's just work through this list and make the pairs.

00:11 All right.

00:12 So for number one, we're looking for a cell type that attacks infected body cells.

00:18 So we know that this must be cytotoxic t cells.

00:23 T cells are responsible for cell -mediated immune responses.

00:29 There's helper t cells and cytotoxic t cells.

00:33 So cytotoxic t cells are activated by helper t cells, and the role of the cytotoxic t cell is to kill infected body cells.

00:44 Okay, so let's make that pair.

00:51 Done.

00:53 All right.

00:53 Number two, a cell that secretes antibodies.

00:58 So b cells are the cells that secrete antibodies.

01:01 These cells are responsible for the humoral immune response, which defends primarily against bacteria and viruses present in bodily fluids.

01:13 As their mechanism of response, they secrete antibodies and the secretion is stimulated by helper t cells.

01:24 So we can make that pair.

01:29 Okay, a white blood cell that engulfs cells or molecules.

01:34 So now we're going to be switching gears a little bit talking about innate immunity.

01:40 Innate immunity is a set of defenses that are active immediately upon infection and are the same whether or not the pathogen has been encountered previously...

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