Which one of the following animals has two separate circulatory pathways?

1. Frog

2. Lizard

3. Whale

4. Shark

Subtopic:  Circulatory Pathways |
 70%
From NCERT
NEET - 2015
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Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when:

1. AV valves open up
2. Ventricular walls vibrate due to the gushing of blood from the atria
3. Semi-lunar valves close down after the blood flows into vessels from the ventricles
4. AV node receives a signal from SA node

Subtopic:  Human Heart: Cardiac Cycle |
 91%
From NCERT
NEET - 2015
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Blood pressure in the mammalian aorta is maximum during:

1. systole of the left atrium
2. diastole of the right ventricle
3. systole of the left ventricle
4. diastole of the right atrium

Subtopic:  Human Heart: Cardiac Cycle |
 73%
From NCERT
NEET - 2015
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Which one of the following is correct?
1. Serum = Blood + Fibrinogen
2. Lymph = Plasma + RBC + WBC
3. Blood = Plasma + RBC + WBC + Platelets
4. Plasma = Blood – Lymphocytes

Subtopic:  Blood: General Description & RBC: Part 1 | Blood: General Description & RBC |
 74%
From NCERT
NEET - 2015
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Person with blood group AB is considered as universal recipient because he has:
 

1. both A and B antigens on RBC but no antibodies in the plasma
2. both A and B antibodies in the plasma
3. no antigen on RBC and no antigens in the plasma
4. both A and B antigens in the plasma but no antibodies

Subtopic:  Blood: Blood Group (A,B,O) |
 77%
From NCERT
AIPMT - 2014
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How do parasympathetic neural signals affect the working of the heart?
 

1. reduce both heart rate and cardiac output
2. Heart rate is increased without affecting the cardiac output
3. Both heart rate and cardiac output increased
4. Heart rate decreases but cardiac output increases

Subtopic:  Regulation of Cardiac Activity |
 78%
From NCERT
AIPMT - 2014
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The diagram given here is the standard ECG of a normal person, The P - wave represents the:

170951
1. Initiation of the ventricular contraction
2. Beginning of the systole
3. End of systole
4. Contraction of both the atria
Subtopic:  ECG & Coronary Artery Disease |
 75%
From NCERT
AIPMT - 2013
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Figure shows a schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function/s. 

1. B-Pulmonary artery- takes blood from heart to lungs, PO2 = 90mm Hg
2. C-Vena Cava- takes blood from body parts to right auricle, PCO2 = 45mm Hg
3. D-Dorsal aorta- takes blood from heart to body parts, PO2 = 95mm Hg
4. A- Pulmonary vein - takes impure blood from body parts, PO2 = 60mm Hg

Subtopic:  Human Heart: Double Circulation |
 74%
From NCERT
AIPMT - 2013
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Figure shows blood circulation in humans with labels A to D. Select the option which gives correct identification of label and functions of the part:

 
1. B - Capillary - thin without muscle layers and well two-cell thick
2. C - Vein - thin-walled and blood flows in jerks./spurts
3. D - Pulmonary vein - takes oxygenated blood to heart PO2=95 mm Hg
4. A - Artery- thick-walled and blood flows evenly

 
Subtopic:  Human Heart: Double Circulation |
 68%
From NCERT
NEET - 2013
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The figure shows a human blood cell. Identify it and give its characteristics:

 
Blood cell  Characteristics 
1. Basophils Secrete serotonin 
2. B-lymphocytes form about 20% of blood cells involved in immune response 
3. Neutrophils Most abundant blood cells, phagocytic
4. Monocytes Life spans 3 days, produce antibodies
Subtopic:  Blood: General Description & RBC |
 54%
From NCERT
NEET - 2013
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