Lesson 6: adaptive immunity

What feature of adaptive immunity allows for a faster

stronger response on re-exposure?

Which cells are responsible for humoral immunity?

B cells (plasma cells secrete antibodies)

Which cells are responsible for cellular immunity?

T cells (Helper

What are antigens?

Foreign molecules that trigger an immune response

What are antibodies?

Y-shaped proteins from B cells that bind antigens

List four functions of antibodies.

Neutralization

Which MHC is on all nucleated cells?

MHC I

Which MHC is on antigen-presenting cells (APCs)?

MHC II

What do APCs do?

Process/present antigens to T cells

Where do T cells mature?

Thymus

Where do B cells mature?

Bone marrow

Which CD molecule is found on Helper T cells?

CD4

Which CD molecule is found on Cytotoxic T cells?

CD8

What is the role of Helper T cells?

Activate B cells

What is the role of Cytotoxic T cells?

Kill infected or abnormal host cells

What is the role of Regulatory T cells?

Suppress overactive immune responses

What is the primary immune response?

First exposure; slower

What is the secondary immune response?

Subsequent exposure; faster

What is active adaptive immunity?

Body produces its own antibodies (infection or vaccine)

What is passive immunity?

Receiving ready-made antibodies (placenta

How do vaccines work?

Expose body to antigen; build memory without causing disease