Chapter 16 Tortora

Chapter 16 Tortora - Chapter 16 Tortora Innate...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 16 Tortora Innate Immunity-Nonspecific Defenses
Background image of page 1

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

View Full DocumentRight Arrow Icon
Types of immunity Innate immunity-defense present at birth Rapid response No memory component First line of defense and second line of defense is in this category Adaptive or specific immunity is the defense that kicks in once the innate has been breached This involves lymphocytes (T and B cells)
Background image of page 2
First line of Defense Skin and mucous membrane Contain both physical and chemical features Physical-intact skin is First barrier! Epidermis has keratin (protein) that helps waterproof skin Cells are closely packed and dry usually Mucous membrane-line openings to outside Mucus keeps these openings moist Some bacteria can penetrate the membrane like Treponema pallidum
Background image of page 3

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

View Full DocumentRight Arrow Icon
Physical barriers continued Lacrimal apparatus-produce and drain tears Tears wash eye and cleans it Saliva also washes out mouth and dilutes the number of bacteria Very small hairs found in nose help filter air and trap bacteria Cilia in lower respiratory tract move dust and microorganisms trapped in mucous upward toward throat and you swallow it (cigarettes are toxic to this ciliary escalator )
Background image of page 4
More physical barriers Epiglottis-prevents microbes from entering lungs during swallowing Urine-cleans urethra Vaginal secretions-remove microbes from female Defecation-removes waste Vomiting-rids the body of harmful substances
Background image of page 5

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

View Full DocumentRight Arrow Icon
Chemical factors Sebaceous glands produce sebum which prevents hair from drying out and forms a protective film over skin Contain unsaturated fatty acids which inhibit growth of some pathogens and fungi Helps provide a pH of 3-5 which also discourages bacterial growth Sweat glands produce perspiration which helps flush bacteria from surface of skin Contains lysozyme which breaks down cell wall of gram positive and some gram negative
Background image of page 6
Chemical continued Lysozyme is also in tears, saliva, nasal secretions, and tissue fluids Alexander Fleming was studying lysozyme
Background image of page 7

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

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/13/2010 for the course BIO 3302 taught by Professor Dr.nasreenhaque during the Fall '09 term at CUNY City Tech.

Page1 / 21

Chapter 16 Tortora - Chapter 16 Tortora Innate...

This preview shows document pages 1 - 8. Sign up to view the full document.

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