Answer:
(a) Differences between Blood and Lymph. Refer to Ans. 5 of This chapter (see above).
(b) Differences between Open and Closed Circulatory System
(c) Differences between Systole and Diastole
S.N.
Open Circulatory System
Closed Circulatory System
1.
2.
3.
It is present in arthropods and
molluscs,
Blood pumped by heart passes
through large vessels into open
spaces or body cavities called
sinuses.
Flow of blood is not regulated
precisely,
It is present in annelids and
chordates.
Blood pumped by the heart is
circulated through a loosed network
of blood vessels.
It is more advantageous as the blood
flow is more precisely regulated;
(d) Differences between P-wave and T-wave
S.N.
Systole
Diastole
1.
2..
3.
The contraction of the musclesof
auricles and ventricles is called
systole.
It increase the ventricular pressure
causing the closure of tricuspid and
bicuspid valves due to attempted
back flow of blood into atria,
Systolic pressure is higher and occurs
during ventricular contraction.
It is the relaxation of atria and ventricle
muscle.
The ventricular pressure falls causing
the closure of semilunar values
which prevent back flow of blood into
the ventricle.
Diastolic pressure is lower and
occurs during ventricular expansion.
P-wave
T-wave
The P-wave represents the electrical
excitation (or depolarisation) of the
atria, which leads to the contraction of
both the atria, marks the end of systole.
The T-wave represents the return of the
ventricles from excited to normal state
(repolarisation). The end of the T-wave
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