7.1 What is a healthy organism? - Questions and answers Q1. Bk

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7.1 What is a healthy organism? - Questions and answers
Q1.
Bk Ch7 S7.1 Q1
Define the word ‘disease’.
A1.
Bk Ch7 S7.1 A1
Disease can be defined as a state of impaired functioning or poor health.
Q2.
Bk Ch7 S7.1 Q2
Outline the difficulties in defining health and disease.
A2.
Bk Ch7 S7.1 A2
It can be difficult to define disease because what is normal may vary between individual organisms.
Q3.
Bk Ch7 S7.1 Q3
Briefly outline how each of the following contribute to the health maintenance of individuals:
a
function of genes
b
mitosis
c
cell differentiation
d
cell specialisation.
A3.
Bk Ch7 S7.1 A3
a
b
c and d
Genes contribute to the maintenance of health in individuals because their function is to produce
the proteins required for normal cellular processes. When the incorrect proteins are produced or
when essential proteins are not produced cell function is impaired and the health of the individual
will be affected.
Mitosis allows identical copies of cells to be produced and this is important not only in the growth
of organisms but also in repairing damaged cells and tissues during periods of ill health or
damage.
Cell differentiation is important in the health maintenance of organisms because it gives rise to
specialised cells that carry out particular functions. When specialised cells are damaged or die
they need to be replaced so that normal functioning can occur.
Q4.
Bk Ch7 S7.1 Q4
Describe an example of how the body can adapt to changes in the internal environment to ensure that
an individual’s health is maintained.
A4.
Bk Ch7 S7.1 A4
Environmental changes can have an impact on the normal functioning of the body but often the body
can adapt to the changes to ensure health is maintained. For example, when humans relocate to higher
altitudes their bodies respond by increasing the number of red blood cells.
7.1 Healthy organism QA
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