micro exam 3 part 3

Slightly acidic pH, a high concentration of sodium chloride, and lack of moisture in many areas. The outer layer of the skin has a thick layer of closely packed cells called keratinocytes, that helps prevent against penetration of bacteria and continuous shedding of the outer epithelial cells prevents build up of microorganism.

Propionibacterium acnes.

• 1. A continuous stream of mucus is generated by the goblet cells and traps microorganisms. The ciliated epithelial cells constantly move the trapped microorganisms out of the respiratory tract
• 2. Alveolar macrophages destroy (phagocytize) pathogens that get to the alveoli.A bactericidal effect is then exerted by lysozyme (an enzyme that is present in the nasal mucus)

Complement is a heat-liable component of human blood plasma that augments phagocytosis. It is composed of over 30 serum proteins . It defends against bacterial infections, bridges innate and adaptive immunity, and disposes of waste. It works in a cascade fashion (once one is activated it triggers the activation of others).

Animals or organisms that are germfree or one that which all microbiota are known. They are usually more susceptible to pathogens, thus, the number of microorganisms necessary to infect and produce disease are much smaller.

Complement is a heat-liable component of human blood plasma that augments phagocytosis. It is composed of over 30 serum proteins . It defends against bacterial infections, bridges innate and adaptive immunity, and disposes of waste. It works in a cascade fashion (once one is activated it triggers the activation of others).

Malignant cells, and cells infected with microorganisms.

• 1. Anaerobic, gram-negative and positive bacteria, spore-forming and nonsporing rods
• 2. Duodenum? Gram-positive cocci and rods.

Large intestine (Colon)

Skin

Lactobacillus acidophilus.

Because the female has a much shorter urethra than a male, so it is much easily traversed by microorganisms

Alternative complement pathways.

• A. Fever works by one of 3 complementary pathways
• 1. It stimulates leukocytes to destroy microorganisms.
• 2. Enhances specific activity of the immune system.
• 3. and enhances microbiostatsis (growth inhibition) by decreasing available iron to the microorganism.
• B. Endogenous pyrogen is released by macrophages during infection.

Autoimmune disease- activation of T & B cells, that lead to tissue damage.

• 1. Throughout the body in the junction of the lymphatic vessels.
• 2. Filter and remove foreign antigens, and the activation andproliferation of lymphocytes.

Trick T-cells into activation with no specific triggering agent, causing massive quantities of cytokines CD4+T-cells, leading to organ failure and suppression of specific immune responses.

When Neutrophils and macrophages are unable to destroy the microorganism during inflammation, it starts to wall off and isolate the site causing granuloma.

The skin provides a mechanical barrier to microbial invasions, due to its thick closely packed cells; frequent shedding, and being acidic and salty.

Humoral immunity action antibodies by tagging and marking bacteria, toxins and viruses for destruction. Cell-mediated immunity T-cells directly attack infected cells.