The tricuspid and bicuspid Valves are closed because of

(1) Atrial systole

(2) Attempted backflow of blood into the atria

(3) Ventricular relaxation

(4) Ventricular filling

Subtopic:  Human Heart: Cardiac Cycle |
 81%
From NCERT
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Arrange the following events in a proper sequence.

(i) Increased ventricular pressure

(ii) Attempted backflow of blood into the atria

(iii) Ventricular systole

(iv) Closure of AV valves

(1) (i) – (ii) – (iii) – (iv)

(2) (ii) – (i) – (iii) – (iv)

(3) (iii) – (i) – (ii) – (iv)

(4) (i) – (iii) – (ii) – (iv)

Subtopic:  Human Heart: Cardiac Cycle |
 58%
From NCERT
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Imagine, if the semilunar valves do not work, which of the following event won’t happen surely?

(1) Atrial Contraction

(2) Ventricular Contraction

(3) flow of blood

(4) Heart sound production

Subtopic:  Human Heart: Cardiac Cycle |
 58%
From NCERT
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SAN is responsible for

(1) initiating and maintaining a random contractile ability of heart

(2) initiating and maintaining a rhythmic contractile ability of heart

(3) maintaining a random contractile ability of heart

(4) Initiating a rhythmic contractile ability of heart

Subtopic:  Rhythmic Excitation of Human Heart: Part 1 |
 86%
From NCERT
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Semilunar valves are found between

1. left ventricle and aorta

2. right ventricle and pulmonary artery

3. left ventricle and pulmonary vein

4. both (1) and (2)

Subtopic:  Human Heart: Gross Anatomy |
 81%
From NCERT
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Bicuspid valves are present between

(1) left atria and aorta

(2) right atria and pulmonary artery

(3) left atria and left ventricle

(4) right atria and right ventricle

Subtopic:  Human Heart: Gross Anatomy |
 87%
From NCERT
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Match the following:

p. Lymph                e. Amphibians
q.   Mixed Blood      f.   Tissue Fluid
r. Fibrins                 g. RBC
s. Rh antigen         h. Blood Clot

1. p–g; q–h; r–e; s–f

2. p–f; q–e; r–h; s–g

3. p–e; q–h; r–f; s–g

4. p–f; q–g; r–h; s–e

Subtopic:  Blood: Blood Group | Blood: Blood Clotting | Lymph |
 93%
From NCERT
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Platelets are formed from–

(1) Megakaryoblast

(2) Megakaryocyte

(3) Macrokaryoblast

(4) Macrophages

Subtopic:  Blood: Blood Clotting |
 89%
From NCERT
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______ population has Rh ______ on the surface of ______ present in their ______.

(1) 20%, antigen, platelets, plasma

(2) 80%, antigen, RBC, blood

(3) 80%, antibody, platelet, plasma

(4) 20%, antibody, RBC, blood

Subtopic:  Blood: Blood Group |
 91%
From NCERT
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ABO blood grouping is based on

(1) presence of two soluble antibodies

(2) absence of two surface antigens

(3) presence of two surface antigens

(4) both (2) and (3)

Subtopic:  Blood: Blood Group (A,B,O) |
 66%
From NCERT
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