Q. No.Read the given statements carefully.
Select the correct option.
1. Only statements (a) and (b) are correct.
2. Only statements (a) and (c) are correct.
3. Only statement (c) is correct.
4. Only statements (b) and (c) are incorrect.
| (a) | Congestion of lungs is one of the main symptoms of heart failure. |
| (b) | Each vein has an inner lining of cuboidal endothelium, called tunica intima. |
| (c) | The cardiac output of an athlete will be much lower than that of an ordinary man. |
1. Only statements (a) and (b) are correct.
2. Only statements (a) and (c) are correct.
3. Only statement (c) is correct.
4. Only statements (b) and (c) are incorrect.
Subtopic: Human Heart: Double Circulation | Human Heart: Cardiac Cycle |
58%
From NCERT
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Read the given statements carefully.
How many of the given statements are correct?
1. Four
2. Three
3. Two
4. One
| (a) | The systemic circulation provides nutrients, CO2, and other essential substances to the tissues and takes O2 and other harmful substances away for elimination. |
| (b) | Heart of both humans and cockroach is myogenic. |
| (c) | Intestinal juice along with pancreatic juice is known as succus entericus. |
| (d) | The SAN can generate the maximum number of action potentials, i.e., 70-75 min–1 |
1. Four
2. Three
3. Two
4. One
Subtopic: Human Heart: Cardiac Cycle |
From NCERT
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Read the given statements and select the correct option:
1. Statements (a) and (b) are correct, (c) is incorrect
2. Only statement (c) is correct
3. Statements (b) and (c) are correct, (a) is incorrect
4. Only statement (a) is correct
| (a) | The volume of blood pumped out by the right and left ventricles is the same during each cardiac cycle. |
| (b) | A person whose blood group is O has both A and B antigens on his/her RBCs. |
| (c) | Blood normally contains 15,000-35,000 platelets mm-3 of blood. |
2. Only statement (c) is correct
3. Statements (b) and (c) are correct, (a) is incorrect
4. Only statement (a) is correct
Subtopic: Human Heart: Cardiac Cycle |
73%
From NCERT
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Which of the following statements is/are correct in a healthy human?
(i) During inspiration, the pressure within the chest cavity is lower than outside the body.
(ii) During ventricular systole, the pressure in the atrium is lower than in the ventricles.
(iii) During ventricular systole, the pressure in the aorta is lower than the pressure in the atrium.
1. (i) only
2. (iii) only
3. (ii) and (iii) only
4. (i) and (ii) only
(i) During inspiration, the pressure within the chest cavity is lower than outside the body.
(ii) During ventricular systole, the pressure in the atrium is lower than in the ventricles.
(iii) During ventricular systole, the pressure in the aorta is lower than the pressure in the atrium.
1. (i) only
2. (iii) only
3. (ii) and (iii) only
4. (i) and (ii) only
Subtopic: Human Heart: Cardiac Cycle |
76%
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Assertion (A): Cardiac output can be defined as the volume of blood pumped out by the ventricles per minute.
Reason (R): The stroke volume multiplied by the heart rate (no. of beats per min.) gives the cardiac output.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason (R): The stroke volume multiplied by the heart rate (no. of beats per min.) gives the cardiac output.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Human Heart: Cardiac Cycle |
From NCERT
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Assertion (A): SA node induces excitatory impulses, when blood is poured by pulmonary veins in the left ventricle.
Reason (R): SA node is self excitatory.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is false but (R) is true.
4. Both (A) and (R) are false.
Reason (R): SA node is self excitatory.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is false but (R) is true.
4. Both (A) and (R) are false.
Subtopic: Human Heart: Cardiac Cycle |
56%
From NCERT
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Assertion (A): We can determine heart beat by our pulse on wrist.
Reason (R): Systole causes contraction in wrist vessels and diastole causes relaxation.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Systole causes contraction in wrist vessels and diastole causes relaxation.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Human Heart: Cardiac Cycle |
66%
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Assertion (A): The cardiac output of a normal human is greater than an athelete.
Reason (R): The stroke volume of a normal men is greater than an athelete.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): The stroke volume of a normal men is greater than an athelete.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Human Heart: Cardiac Cycle |
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From NCERT
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Assertion (A): In joint diastole, all the four chambers of heart are in relaxed state.
Reason (R): The atrio-ventricular valves are open and the semilunar valves are closed at this stage.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): The atrio-ventricular valves are open and the semilunar valves are closed at this stage.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Human Heart: Cardiac Cycle |
63%
From NCERT
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Assertion (A): The cardiac impulse which originates from SA node in human heart cannot spread directly from atria to ventricles.
Reason (R): In human heart there is no continuity between cardiac muscle fibres of atria and those of ventricles except AV bundles.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): In human heart there is no continuity between cardiac muscle fibres of atria and those of ventricles except AV bundles.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Human Heart: Cardiac Cycle | Rhythmic Excitation of Human Heart: Part 1 | Rhythmic Excitation of Human Heart: Part 2 |
51%
From NCERT
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