Cancer Topic 2 Flashcards
Cancer stays in one place usually within a membrane
Benign
Isn’t normally dangerous
Benign
Tumour grows and spreads to healthy cells
Malignant
Cells can break off and spread to other parts of the body travelling in the bloodstream
Malignant
Tumour isn’t cancerous
Benign
Form secondary tumours
Malignant
Dangerous and cancerous tumours
Malignant
What are artificial hearts
Mechanical devices that pump blood for a person whose own heart has failed
What is the advantage of an artificial heart
Less risk of rejection because they are made out of plastic and metal and the body doesn’t see it as foreign
How can valve be damaged
By heart attacks, infection, old age.
What may damage to valves cause
It may cause the valve tissue to stiffen and so it won’t open properly
What is artificial blood
A blood substitute e.g. a salt solution hitch is used to replace the lost volume of blood
how is skin a barrier against disease (3)
- forms a protective layer covering the body
- consists of dead cells ad is difficult for pathogens to penetrate
- produces an oily substance called sebum which can kill bacteria
how does the nose prevent us from disease
the hairs and mucus trap pathogens
what are the tranchea and bronchi covered in
tiny hairs called cilia
