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Write the features that distinguish between the two
(a) Plasma and Serum
(b) Open and closed circulatory system
(c) Sino-atrial node and Atrio-ventricular node

Answers (1)

Plasma	Serum
(i) Fluid lacking blood corpuscles is called plasma.	(i) The fluid lacking clotting elements is called serum.
(ii) Clotting materials are present.	(ii) Clotting materials are not present.
(iii) Plays essential role in blood clotting.	(iii) Does not help in blood clotting.

Open circulatory system	Closed circulatory system
(i) Blood is directly flown in target organs.	(i) Blood is supplied to organs by a closed system of vessels.
(ii) The respiratory pigment is not present in most of the cases	(ii) The respiratory pigment is present in all of the cases.
(iii) It is found in arthropods and molluscs.	(iii) Can be found in all vertebrates, annelids, some molluscs.

Sino-atrial Node	Atrio-ventricular Node
(i) Located on the upper side of the right auricle.	(i) Located at the junction of the right auricle and right ventricle.
(ii) Helps in initiating the heartbeat.	(ii) It receives an impulse from the SA node and forwards it further.

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