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Standard XII
Biology
Circulation of Blood
Question

Read the following statements carefully.
(i) In fishes the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart.
(ii) The openings of the right and the left ventricles into pulmonary artery and aorta respectively are provided with the mitral valves.
(iii) The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable.
(iv) The T-wave of ECG represents depolarisation of the ventricles.
Which of the above two statements are incorrect?

  1. ii and iv
  2. i and iii
  3. i and ii
  4. iii and iv

A
i and iii
B
i and ii
C
ii and iv
D
iii and iv
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Solution
Verified by Toppr

In electrocardiography, the T wave represents the repolarization of the ventricles. The opening of right and the left ventricle into the pulmonary artery and aorta are provided with a semilunar valve.
Thus, the correct answer is 'ii and iv.'

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Similar Questions
Q1
Read the following statements carefully.
(i) In fishes the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart.
(ii) The openings of the right and the left ventricles into pulmonary artery and aorta respectively are provided with the mitral valves.
(iii) The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable.
(iv) The T-wave of ECG represents depolarisation of the ventricles.
Which of the above two statements are incorrect?

View Solution
Q2
Read the following statements carefully.
(1) In fishes the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart
(2) The openings of the right and the left ventricles into the pulmonary artery and the aorta respectively are provided with the mitral valves.
(3) The nodal musculature has the ability to generate action potential without any external stimuli, i.e., it is auto-excitable
(4) The T-wave of ECG represents depolarization of the ventricles
Which of the given two statements are correct?
View Solution
Q3
Which of the following statement(s) wrong with regard to heart?
A. Left atrium receives deoxygenated blood from different parts of the body while right atrium receives deoxygenated blood from the lungs.
B. Right atrium receives deoxygenated blood from different body parts while right ventricle pumps deoxygenated blood to the lungs.
C. Left atrium receives oxygenated blood from lungs while left ventricle pumps oxygenated blood to different parts of the body.
D. Pulmonary vein carries deoxygenated blood to the lungs and pulmonary artery brings oxygenated blood towards the heart.
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Q4

Question 17
Which of the following statement(s) is/are true about the heart?

(i) Left atrium receives oxygenated blood from different parts of the body while right atrium receives deoxygenated blood from lungs.

(ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs.

(iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts.

(iv) Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body.

(a) (i)
(b) (ii)
(c) (ii) and (iv)
(d) (i) and (iii)


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Q5

Match the parts of the heart in Column I with the direction of flow of blood in Column II
Column IColumn II(i) Right Ventricle(a) Pumps deoxygenated blood into the pulmonary artery(ii) Pulmonary Veins(b) Takes deoxygenated blood(iii) Left Atrium(c) Receives blood from different parts of the body.(iv) Pulmonary Arteries(d) Bring oxygenated blood from lungs to the heart.(v) Left Ventricle(e) Pumps blood into the aorta.(vi) Right Auricle(f) Receives deoxygenated blood from the pulmonary veins.

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