Match the items in Column 'A' with those in Column 'B'. Rewrite the correct matching pairs.

Column A	Column B
(a) S A Node	Plasma
(b) Defective haemoglobin in RBC	Serum
(c) Muscle fibres located in heart	Pacemaker
(d) The liquid squeezed Out of blood during clotting	Sickle cell anemia
(e) Never tires, keep on contracting and relaxing	Purkinje fibres
(f) Cardiac cycle	Cardiac muscle
(g) Liquid part of the blood Without corpuscles	0.85 sec

Column A

Column B

Explanation

(a) S A Node

Pacemaker

Sino atrial node (SA node) is a set of modified cardiac muscles located near the inter-auricular septum in front of the openings of the venacava into the right auricle. Pace maker is another name for SA node.

(b) Defective haemoglobin in RBC

Sickle cell anaemia

Sickle cell anaemia is a blood disorder inherited from parents. It results in abnormality of haemoglobin which reduces oxygen carrying capacity of red blood cells. The red blood cells become sickle shaped.

(c) Muscle fibres located in heart

Purkinje fibres

Purkinje fibres are finer branches which arise from the bundle of HIS. The purkinje fibres are spread throughout the musculature in the walls of ventricles.

(d) The liquid squeezed Out of blood during clotting

Serum

Serum is the blood plasma from which protein fibrinogen and blood corpuscles have been removed.

(e) Never tires, keep on contracting and relaxing

Cardiac muscle

Cardiac muscles (heart muscles) are involuntary & striated found in the walls & histological foundation of the heart.

(f) Cardiac cycle

0.85 sec

The duration of the cardiac cycle is the reciprocal of heart rate . Assuming a heart rate of 75 beats per minute , each cycle takes 0.85 seconds.

(g) Liquid part of the blood Without corpuscles

Plasma

Plasma is a yellowish coloured liquid component of blood which makes up about 55% of the body's total volume.