biol_119_lecture_13_10-2-09

biol_119_lecture_13_10-2-09 - BioClub Picnic Who: You!...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
BioClub Picnic Who: You! What: Free food and awesome people/ activities. Where: Doty Field When: Today, 4-6 Friday Oct 2nd Why: Relax, get to know your peers and professors and eat up.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Forensic Science: Fact vs. Fiction Jaime Hoey (Geneseo ‘03) Westchester County Forensic Laboratory Forensic Biology Section Biology Department Seminar Friday, October 2 2 pm Newton 203
Background image of page 2
Lecture 13, 10-02-2009 End of 43 and then onto 44 .
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Adaptive Immunity exhibits four important characteristics. Which is Not one of them: a. Specificity a. Inflammation a. Self-nonself recognition b. Diversity c. Memory
Background image of page 4
A. Helper T Cells: A Response to Nearly All Antigens A surface protein called CD4 binds the class II MHC molecule This binding keeps the helper T cell joined to the antigen- presenting cell while activation occurs Activated helper T cells secrete cytokines that stimulate other lymphocytes
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
B. Cytotoxic T Cells: A Response to Infected Cells Cytotoxic T cells are the effector cells in cell-mediated immune response Cytotoxic T cells make CD8 , a surface protein that greatly enhances interaction between a target cell and a cytotoxic T cell Binding to a class I MHC complex on an infected cell activates a cytotoxic T cell and makes it an active killer The activated cytotoxic T cell secretes proteins that destroy the infected target cell
Background image of page 6
C. B Cells: A Response to Extracellular Pathogens The humoral response is characterized by secretion of antibodies by B cells Activation of B cells is aided by cytokines and antigen binding to helper T cells Clonal selection of B cells generates antibody-secreting plasma cells, the effector cells of humoral immunity
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
To fight viral infections, it is most effective to activate A. B cells. B. cytotoxic T cells. C. macrophages. D. the inflammatory response E. neutrophils
Background image of page 8
Antibody Classes
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The Role of Antibodies in Immunity Neutralization occurs when a pathogen can no longer infect a host because it is bound to an antibody Opsonization occurs when antibodies bound to antigens increase phagocytosis Antibodies together with proteins of the complement system generate a membrane attack complex and cell lysis
Background image of page 10
D. Active and Passive Immunization E. Immune Rejection Concept 43.4: Disruption in immune system function can elicit or exacerbate disease
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapter 44 Osmoregulation and Excretion
Background image of page 12
Overview: A balancing act The physiological systems of animals operate in fluid environments The relative concentrations of water and solutes in this environment must be maintained within fairly narrow limits Freshwater animals s how adaptations that reduce water uptake and conserve solutes Desert and marine animals face desiccating environments with the potential to quickly deplete the body water
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Concept 44.1: Osmoregulation balances the uptake and loss of water and solutes Osmoregulation is based largely on controlled movement of solutes between internal fluids and the external environment
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 38

biol_119_lecture_13_10-2-09 - BioClub Picnic Who: You!...

This preview shows document pages 1 - 15. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online