lqc 4 exam qs Flashcards
A wound is an injury to living tissue. The healing of a wound involves an inflammatory phase. Explain the appearance of the wound in this phase.
red/swollen, because of increased blood flow to the area
describe what is meant by a non specific response to infection
a response that is effective against a wide range of infectious agents, doesn’t involve recognition of infectious agent, doesn’t react to specific antigens
Using the fluid mosaic model of cell membranes, explain how a macrophage carries out phagocytosis of bacteria.
membrane receptors interacts with bacteria, pseudopodia formed around the bacteria, membranes of pseudopodia fuse to form a vacuole, change in shape of membrane is due to fluidity of membrane, caused by movement of phospholipids
explain how macrophages present antigens to T helper cells
macrophage binding to T helper cell, MHC on macrophage, CD4 receptor on T cell
The human body responds to infection by viruses in a number of ways. The non-specific response involves interferon. Explain the importance of interferon in the body’s response to infection by viruses
prevents viruses attaching to uninfected host cells, by binding to receptors, therefore preventing viruses from entering cell so viruses can’t replicate and infect more cells