If due to some injury the chordae tendineae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect?

1. The flow of blood into the aorta will be slowed down

2. The 'pace maker' will stop working

3. The blood will tend to flow back into the left atrium

4. The flow of blood into the pulmonary artery will be reduced

Sympathetic nervous system induces:

1. heartbeat

2. secretion of digestive juice

3. secretion of saliva

4. All of the above

The blood group with antibody-a and antibody-b is:

1. B

2. A

3. O

4. AB

Rate of heartbeat is determined by:

1. Purkinje fibres

2. papillary muscles

3. SA-node

4. AV-node

Match the Column I and Column II:

What would be the heart rate of a person if the cardiac output is 5L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?

1. 125 beats per minute

2. 50 beats per minute

3. 75 beats per minute

4. 100 beats per minute

Assertion: Right atrium and right ventricle of heart are known as pulmonary heart.

Reason: Both right atrium and ventricle pump the deoxygenated blood.

Aging RBCs are phagocytized by macrophages in the mononuclear phagocyte system [sleen or liver] and their components are recycled, EXCEPT for the

1. iron atom from the heme group, which is excreted in bile

2. globin peptide chains, which are sent to the kidneys for excretion

3. globin peptide chains, which are converted into bilirubin

4. heme group (minus the iron atom), which is converted into a green pigment called biliverdin

The normal pacemaker of the human heart, sinoatrial node, is derived from the more primitive:
1. ventricle

2. bundle of His

3. conus arteriosus

4. sinus venosus

Amongst the following, a molecule that would lead to coagulation of the blood would be:
1. prostacyclin
2. tissue factor or thromboplastin
3. plasmin
4. tissue plasminogen activator