Save
Biology combined science edexcel higher
Health and disease
Save
Share
Learn
Content
Leaderboard
Learn
Created by
Rebea T
Visit profile
Cards (27)
Health
The complete
social
,
physical
and mental well-being of a person
Disease
Any change in the
normal
function of a part of the body
Types of diseases
Communicable
Non-communicable
Communicable diseases
Can be
spread
from
person
to person
Non-communicable diseases
Cannot be
spread
from person to person, mainly caused by lifestyle or
genetics
Causes of communicable diseases
Pathogens
(microorganisms that can cause disease)
Bacteria
(e.g. cholera, tuberculosis)
Fungi
(e.g. chlora diet ashbach)
Protists
(e.g. malaria)
Viruses
(e.g. HIV, chlamydia)
Vectors
Something that has the disease and spreads it onto something else (e.g.
mosquitoes
for
malaria
)
Viruses
Pathogens made up of genetic material (DNA or
RNA
) surrounded by a
protein
coat
Lytic pathway of virus replication
1.
Virus inserts genetic material into cell
2. Virus uses
cell
parts
to
make
new
viruses
3. Cell
lyses
(explodes) releasing
new
viruses
Lysogenic pathway of virus replication
1. Virus
inserts
genetic
material
into
cell's
DNA
2.
Virus
genetic
material
replicates
as cell
divides
3.
Trigger
causes
virus
to enter
lytic
cycle
Barriers to pathogens in the human body
Physical
barriers (
skin
,
mucus
,
cilia
)
Chemical
barriers (
stomach
acid,
lysozyme
)
Types of white blood cells
Phagocytes
(engulf pathogens)
Lymphocytes
(produce antibodies)
Antigens
Flags on cells that
identify
them as
belonging
to the body
Antibodies
Produced by
lymphocytes
to bind to and
destroy
pathogens
Vaccines
Contain
dead
or
weakened
pathogens
to
stimulate
an
immune
response
Monoclonal antibodies
Antibodies produced by hybridoma cells (fused
lymphocyte
and
tumour
cell)
Uses of monoclonal antibodies
Pregnancy
tests
Tumour
detection
Drug development process
1.
Pre-clinical
trials (testing on human tissue, animals)
2.
Clinical
trials (testing on healthy humans, ill humans, large trials)
Efficacy
How well a
drug
works
Toxicity
Side effects
of a drug
Causes of non-communicable diseases
Lifestyle
choices (e.g. obesity, smoking)
Genetics
BMI
(Body Mass Index)
Measure of
obesity
calculated as mass divided by
height
squared
Waist to hip ratio
Measure of abdominal obesity calculated as
waist
measurement divided by
hip
measurement
Smoking
Leads to
fatty
buildup in arteries, restricting
blood flow
and causing cardiovascular disease
Cardiovascular disease
(CVD)
Problems with the
heart
or
blood vessels
Treatments for CVD
Stents
Statins
Plant
defences
Waxy
cuticle on leaves
Cell walls