Multiple Choice QuestionsWhich one of the following is mainly responsible for the second heart sound?
Closure of atrioventricular valves
Opening of atrioventricular valves
Closure of semilunar valves
Thrust of blood on ventricular wall during atrial contraction
The vein which is formed from the capillaries of an organ and terminates into capillaries in some other organ before entering the heart is called
pulmonary vein
coronary vein
portal vein
systemic vein
Choose the right sequential phenomena among the following during the delivery of O2 from blood to tissue.
I. Absorption of CO2 by the blood.
II. Reaction of absorbed CO2 with H2O to form H2CO3 within RBC and its conversion into H+ and HCO3- ions.
III. Reaction of absorbed CO2 with H2O in plasma to form H2CO3 and its conversion into H+ and HCO3- ions.
IV. Combination of H+ with haeme portion of HbO2 to release O2.
V. Combination of HCO3- with haeme portion of HbO2 to form reduced haemoglobin and release of O2.
I, II and V
I, III and IV
I, II and IV
I, III and V
Match the items in column I with those in column II and choose the correct answer.
| Column I | Column II |
| A. Electroencephalography | 1. A graphic recording of the electrical activity of heart |
| B. Electrocardiography | 2. A graphic recording of the electrical activity of brain. |
| C. Endoscopy | 3. A technique that gives image automatically in multiple planes. |
| D. MRI | 4. To view within th body without cutting through the overlaying tissues. |
A- 2; B- 1; C- 4; D- 3
A- 4; B- 2; C- 3; D- 4
A- 1; B- 3; C- 2; D- 4
A- 3; B- 4; C- 1; D- 2
Figure shows schematic plan of blood circulation in human with labels - A to D. Identify the label and give its function/s.
A - pulmonary vein - takes impure blood from body parts, pO2 = 60 mmHg
B - pulmonary artery - takes blood from heart to lungs, pO2 = 90 mmHg
C - vena cava - takes blood from body parts to right auricle, pCO2 = 45 mmHg
D - dorsal aorta - takes blood from heart to body parts, pO2 = 95 mmHg
The diagram given here is the standard ECG of a normal person. The P - wave represents the
contraction of both the atria
initiation of the ventricular contraction
beginning of the systole
end of systole
Which valve is present at the opening of coronary sinus?
Mitral valve
Eustachian valve
Thebesian valve
Tricaspid valve
C.
Thebesian valve
The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the heart muscle. It delivers deoxygenated blood to the right atrium, as do the superior and inferior vena cava. It returns the blood from the substance of the heart, and is protected by a semicircular fold of the lining membrane of the right atrium, at the orifice of the coronary sinus known as thebesian valve (i.e., valve of coronary sinus). Its main function is to prevent the regurgitation of blood into the sinus during the contraction of the atrium.
The mitral valve is a valve that lets blood flow from one chamber of the heart, the left atrium, to another called the left ventricle.
The Eustachian valve (also known as the "valve of the inferior vena cava") is a ridge of variable thickness in the inferior right atrium. It is a remnant of a fetal structure that directed incoming oxygenated blood to the foramen ovale and away from the right atrium.
The tricuspid valve, or right atrioventricular valve, is on the right dorsal side of the mammalian heart, between the right atrium and the right ventricle. Its function is to prevent back flow of blood from the right ventricle into the right atrium.
Which blood cells can engulf bacteria by phagocytosis?
Eosinophil and basophil
Basophil and lymphocyte
Neutrophil and monocyte
Neutrophil and lymphocyte
Which of the following factor(s) increase blood pressure?
Increase of cardiac output
Constriction of blood vessel
Activation of parasympathetic nerve
Increase of blood volume
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