Read the following
a. Lymph absorbs and transports fat from the intestine
b. Lymph nodes produce fibrinogen.
c. Lymphatic capillaries present in the intestinal villi are known as lacteals.
d. Lymph transports oxygen only.
Which of these statements are true?
1. a, c
2. b, d
3. c, d
4. a, b
Atrial systole
1. Increases the flow of blood into the ventricles by 70 percent
2. Is due to the generation of the action potential in AVN
3. Increases the flow of blood into the ventricles by 30 percent
4. Coincides with ventricular systole
Which of the following is known as the natural pacemaker of the heart?
1. Sino atrial node
2. Atrioventricular node
3. Bundle of His
4. Purkinje fibers
A patch of nodal tissue responsible for initiating the rhythmic contractile activity of heart is present in
1. Lower left corner of the left ventricle
2. Upper right corner of the right atrium
3. Lower left corner of the right ventricle
4. Upper left corner of the left atrium
The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of
1. Atrioventricular bundle
2. Purkinje system
3. Sinoatrial node
4. Atrioventricular node
The impulse of heartbeat originates from
1. SA node
2. AV node
3. Vagus nerve
4. Cardiac nerve
Rate of heartbeat is determined by
1. Purkinje fibers
2. Papillary muscles
3. AV-nodes
4. SA-node
_________ is known as the graveyard of RBCs.
1. Liver
2. Spleen
3. Pancreas
4. Bone marrow
The life span of the erythrocytes in humans is about
1. 120 days
2. 150 days
3. 190 days
4. 180 days
Oxygen carrier in human blood is
1. Carbonic anhydrase
2. Haemoglobin
3. Haemocyanin
4. Both (1) & (3)