Answer:
(a) Difference
between plasma and serum are as follows
a) Difference between plasma
and serum are as follows
Blood Plasma
Blood Serum
It is the fluid without blood
corpuscles.
It is faint yellow in colour.
It has fibrinogen and other
clotting materials.
It takes part in blood
clotting.
It is liquid without clotting
elements.
It is pale yellow.
It does not have fibrinogen
and other clotting materials.
It does not take part in
blood clotting.
(b) Difference between open
and closed circulatory system are as follows
Open Circulatory
System
Closed
Circulatory System
Open circulation occurs in
arthropods and mollusks. The blood is not completely enclosed within vessels,
the heart pumps blood through arteries into large cavities or sinuses, where
it mixes with the interstitial fluid and bathes the cells of the body. Circulation
is slower in an open system, because some of the blood pooled in sinuses and,
the heart is unable to build up enough pressure to make the blood flow
rapidly.
Respiratory pigment, if
present, is dissolved in the plasma, no red corpuscles are present.
It occurs in annelids
(earthworms), some mollusks and all vertebrates.
In closed circulatory system,
materials move between the blood and interstitial fluid through thin walls
capillaries.
Blood flows at a high
pressure in a closed circulatory system.
Respiratory pigment is
present which may be dissolved in the plasma but is usually contained red
blood corpuscles.
(c) Difference between sino
atriol node and artrio-ventricular node are as follow
SA Node
AV Node
It is the small mass of specialised
muscle cells in the wall of right atrium near the opening of vena cava. It
initiates and maintains the heart beat.
It is situated in the fibrous
ring between the right atrium and ventricle of the heart.
It is the pathway through,
which electrical impulses can pass.
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