Flashcards in Chapter 2 (page 11) Deck (13):
A proteins that help enhances non-specific immunity and protect the body against viruses:
This binding process hinders the ability of viruses to multiply within these cells:
Interferon molecules diffuse to nearby cells and bind to their membrane receptors.
What is Fever?
Abnormally high body temperature represents a systemic response to invading micro-organisms.
What is the normal body temperature?
37 degrees C or 98.6 degrees F
Normal body temperature increases in response to chemicals called ___________ , which are secreted by leukocytes, and macrophages exposed to bacteria.
What happen if there is a fever?
High fevers are dangerous because excess heat inactivates enzymes.
Mild or moderate fevers (102 - 103 F) benefit the body. Bacteria require large amounts of iron and zinc to proliferate.During a fever the body hides these minerals in the spleen and liver making them less available to the bacteria.
Fever also speeds up the defensive actions and repair process.
It provides specific protection against invading agents. It involves the bodies ability to remember and to recognition and respond to these agents:
Activity of immune system is called:
the immune response.
The immune response recognizes and is directed against particular pathogens or foreign bodies.
The immune response : Is Antigen - specific
Immunity is not restricted to the initial infection site.
The immune response : Is systemic
After initial exposure the immune system recognizes and mounts an even stronger attack on the previously encountered pathogens.
The immune response : Has memory
Is it true that, the first time the body is invaded by certain bacteria, disease symptoms may occur. The second time the body is invaded by the same bacteria, no symptoms occur. (The person has become immune). Here the immune system must be exposed to a foreign substance (antigen) before it can protect the body against the substance.