Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The
second sound is heard when
AV valves open up
Ventricular walls vibrate due to gushing in of blood from atria
Semilunar valves close down after the blood flows into vessels from ventricles
AV node receives the signal from SA node
Erythropoiesis starts in:-
kidney
liver
spleen
red bone marrow
Blood pressure in the mammalian aorta is maximum during
systole of the left atrium
diastole of the right ventricle
systole ot the left ventricle
diastole of the right atrium
One of the factors required for the maturation of erythrocytes is
vitamin - D
vitamin - A
vitamin - B12
vitamin - C
Vitamin-K is required for
change of prothrombin to thrombin
synthesis of prothrombin
change of fibrinogen to fibrin
formation of thromboplastin
The thick muscular projections on the walls of the ventricle are called
Chordae tendineae
Columnae carneae
Conus arteriosus
Truncus arteriosus
When type B agglutinogen is not present on the surface of RBC of a person, his plasma would contain ____ agglutinins.
Anti-a
Both anti-a and anti-b
Oxalates and citrates are used as anticoagulants in stored blood because they:
Chelate calcium ions
Act as competitive inhibitors of vitamin K
Potentiate anti-thrombin III
Activate heparin
With respect to blood, the composition of lymph can be expressed as:
No RBc, No Plateletes, Less proteins, Less calcium and phosphorus, Predominant corpuscles lymphocytes.
No RBc, No Plateletes, Less proteins, More calcium and phosphorus, Predominant corpuscles lymphocytes.
No RBc, Less or no Plateletes, Less proteins, Less calcium and phosphorus, Predominant corpuscles macrophages.
No RBc, less Plateletes, Less proteins, Less calcium and phosphorus, Predominant corpuscles monocytes.
Histamine in blood is secreted by:
Mast cells
Macrophages
Eosinophils
Basophils
A person with AB blood group:
Has A and B antigens in his plasma
Lacks any antibodies on RBC surface
Can receive blood transfusion from a person of his own group.
Can donate blood to all other group recipients
The inter-atrial septum in the human heart can be best described as:
A thin muscular wall
A thick muscular wall
A thin fibrous tissue
A thick fibrous tissue
The sino-atrial node is the normal pacemaker of the human heart because:
It is located in the right atrium
It is the only part of the conducting system that can generate impulse
It can generate the maximum number of action potentials in the conducting system
It produces action potentials that are more in size than the other parts of the conducting system.
What percentage of ventricular filling is achieved by atrial contraction?
30
50
70
90
The second heart sound during the cardiac cycle is produced by the:
Simultaneous opening of the atrioventricular valves
Simultaneous closure of the atrioventricular valves
Simultaneous opening of the semilunar valves
Simultaneous closure of the semilunar valves
In a surface ECG the QRS complex represents:
Atrial depolarization
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
Normal activities of the human heart are regulated:
Intrinsically
By the autonomic nervous system
By the brain stem
By the diencephalon
A common symptom produced by myocardial ischemia is:
Hypertension
Vertigo
Angina
Hyperventilation
The steps of the cardiac cycle in sequence are...
isovolumic contraction, isovolumic relaxation, ejection, passive ventricular filling, active ventricular filling.
isovolumic relaxation, isovolumic contraction, ejection, passive ventricular filling, active ventricular filling.
isovolumic contraction, ejection, isovolumic relaxation, passive ventricular filling, active ventricular filling.
isovolumic contraction, ejection, isovolumic relaxation, active ventricular filling, passive ventricular filling
A decrease in plasma albumin levels is likely to affect:
Clot formation
Oxygenation of hemoglobin
Osmotic balance
Immune functions
Which of the following is a correct statement:
The volume of blood in pulmonary circulation is more than the volume of blood in systemic circulation at any instant
The blood pressure in pulmonary circulation is less than that of the systemic circulation
Double circulation is characteristic of all vertebrates
A double aortic arch is seen in birds and mammals
There is a possibility of exposure of the maternal blood [of Rh -ve mother] to small amounts of Rh +ve blood from the fetus during the:
First trimester of any pregnancy
Third trimester of the second pregnancy only
Delivery of the child
There is no such possibility
Choose the correct order for the steps of hemostasis:
Blood coagulation, platelet plug formation, blood vessel spasm
Platelet plug formation, blood coagulation, blood vessel spasm
Blood vessel spasm, platelet plug formation, blood coagulation
Blood vessel spasm, blood coagulation, platelet plug formation
The right atria of the human heart receives:
Oxygenated blood
Deoxygenated blood
Arterial blood
Venous blood
Explain the reason there is a delay in processing the electrical signal from the AV node to the AV bundle. To:
allow the atria to complete their contraction prior to ventricular contraction
The hepatic portal vein drains blood to liver from
stomach
kidneys
intestine
Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature?
(I) They do not need to reproduce.
(II) They are somatic cells.
(III) They do not metabolise.
(IV) Their internal space is available for oxygen transport.
CODES
(II) and (III)
Only (IV)
Only (I)
(I), (III) and (IV)
Name the blood cells, whose reduction in number can cause clotting disorder, leading to excessive loss of blood from the body.
Erythrocytes
Leucocytes
Neutrophils
Thrombocytes
Serum differs from blood in
lacking globulins
lacking albumins
lacking clotting factors
lacking antibodies
Blood pressure in the pulmonary artery is
more than that in the carotid
more than that in the pulmonary vein
less than that in the venae cavae
same as that in the aorta
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