1.Q.Why does an overdose of sleeping pills cause
Ans.Sleeping pills contains salt like alplazlam,
diazipalm, nitrogipalm or other tricyclic anti-
hypertensions. These pills shows onset action
on our central nervous system situated at the
hypothalamus.These onset action depresses
our brain which result in sleep. On excess doses
of sleeping pills, the central nervous system of
the brain gets completely inactive and thus stops
our regular body action thus causing death.
2.Q. Why does the blood clot outside the body
and not in blood vessels?
Ans:Blood clotting is a mechanism carried out by
an important inactive enzyme in our blood called
prothrombin which is kept in check with another
substance in the blood called anti-prothrombin
or heparin. Thus, inside the body blood does not
coagulate due to the presence of this heparin. When
an injury occurs and the blood begins to escape from
the injured tissue cells, blood platelets release a substance
called platelet factor-3 which combines with blood proteins
and convert them to prothrombo plastin which changes
to thromboplastin when they react with calcium ions.
This thromboplastin changes inactive prothrombin
into active thrombin which acts on blood the protein
fibrogen to change it to fibrin. Fibrin becomes a network
of fine fibres to form a blood clot.
3.Q. Why do we sleep?
Ans.Our brain has a cell signalling the pathway.
It’s circuit regulates the brain. Sleep occurs when
the brain receives sleep signal.
4.Q.Why nails and hair continues to grow even 5 to 6
hours after death?
Ans.All the cells of the human body do not die at the
time of death. Hence the metabolic process continues.
Cell dies, only after the oxygen supply to that particular
area was reduced, thus leading to the phenomenon.
This is another reason, as to why human organs can be
transplanted, even after a few hours of death.
5.Q. Why faces of animal off springs resemble their
parents while this is not the case in humans ?
A person is a combination of two cells-one from
the mother, another from the father. The DNA of
two cells can never be the same. Hence even the
twins are not similar. Same is the case with animals.
However we are unable to perceive it.