Lubb sound at the end of systole

Dup sound at the end of systole

Dup sound at the beginning of ventricular systole

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NEET • BIOLOGY • BODY FLUIDS AND CIRCULATION

Body fluids and circulation practice · Mixed difficulty

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121 Medium

121 of 335

Remembering +4 | -1

Blood is a

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Correct option: C

Both (a) and (b)

Option C (Both (a) and (b)) is correct because blood is a connective tissue that is both mobile and liquid, allowing it to transport substances throughout the body.

122 Medium

122 of 335

Understanding +4 | -1

Assertion: RBCs are devoid of nucleus in most of the mammals
Reason: Entire cytoplasm of RBCs is filled with red coloured, iron containing complex protein called haemoglobin.

View answer and explanation

Correct option: A

Both assertion and reason are true and reason is the correct explanation of assertion

Option A (Both assertion and reason are true and reason is the correct explanation of assertion) is correct because the absence of a nucleus in RBCs allows more space for hemoglobin, which is essential for oxygen transport.

123 Hard

123 of 335

Remembering +4 | -1

Thickening of arteries due to cholesterol deposition is:

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Correct option: A

Arteriosclerosis

Option A (Arteriosclerosis) is correct because it refers to the thickening and hardening of arteries due to cholesterol deposition.

124 Easy

124 of 335

Understanding +4 | -1

Mammals are said to have double circulation.
It means

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Correct option: C

there are two systems, one from the heart to
the lungs and other from heart to the rest of
the body

Option C is correct because double circulation refers to the presence of two separate circulatory pathways: one to the lungs (pulmonary) and one to the rest of the body (systemic).

125 Easy

125 of 335

Analyzing +4 | -1

Identify the incorrect statements and correct choose the correct option accordingly
I. Interstitial fluid (tissue fluid) and lymph have almost similar composition
II. Lymph and interstitial fluid have no larger proteins and RBC
III. Exchange of the nutrients and gases, etc., between the blood and cells always occurs through tissue fluid
IV. Interstitial fluid has the same mineral distribution as that of the plasma
V. Lymph can be defined as the blood minus RBC but has specialised lymphocytes

View answer and explanation

Correct option: D

None of the above

Option D (None of the above) is correct because all the statements are correct regarding the composition and function of interstitial fluid and lymph.

126 Medium

126 of 335

Application +4 | -1

A person went to a cardiologist complaining about being tachycardic. Upon examination, his heart rate was 100 beats per minute; his end-diastolic volume was 100 mL, whereas end-systolic volume was 40 mL, whereas end-systolic volume was 40 mL. what was his calculated cardiac output per minute?

View answer and explanation

Correct option: C

6 L

Option C (6 L) is correct because stroke volume is the difference between end-diastolic and end-systolic volumes (100 mL - 40 mL = 60 mL). Cardiac output is stroke volume multiplied by heart rate, so cardiac output = 60 mL/beat * 100 beats/min = 6000 mL/min = 6 L/min.

127 Medium

127 of 335

Remembering +4 | -1

Animals with complete double circulation are:-

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Correct option: D

Crocodiles, birds, mammals

Option D (Crocodiles, birds, mammals) is correct because these animals have a four-chambered heart, allowing for complete separation of oxygenated and deoxygenated blood.

128 Easy

128 of 335

Remembering +4 | -1

Heart beat increases by

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Correct option: A

Adrenal hormones

Option A (Adrenal hormones) is correct because adrenal hormones like epinephrine (adrenaline) increase heart rate.

129 Easy

129 of 335

Understanding +4 | -1

The valves in the heart allows the blood flow in which direction? I. From atria to ventricles II. From ventricles to pulmonary artery III. From pulmonary artery to aorta Choose the correct option

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Correct option: A

I and II

Option A (I and II) is correct because the valves in the heart ensure unidirectional blood flow from atria to ventricles and from ventricles to the pulmonary artery (or aorta).

130 Medium

130 of 335

Remembering +4 | -1

Anti-A and Anti-B antibodies are not found in which of the following blood group?

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Correct option: A

Option A (AB) is correct because individuals with AB blood group have both A and B antigens on their red blood cells and therefore do not produce anti-A or anti-B antibodies in their plasma.

131 Medium

131 of 335

Remembering +4 | -1

The first heart sound 'Lubb' occurs in which phase of the cardiac cycle?

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Correct option: C

Ventricular systole

Option C (Ventricular systole) is correct because the first heart sound ('Lubb') is produced by the closure of the atrioventricular (AV) valves at the beginning of ventricular systole.

132 Easy

132 of 335

Application +4 | -1

If the heartbeat of a person is about 75 beats per minute, and stroke volume is 70 mL per
minute, then the cardiac output will be

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Correct option: B

5250 mL

Option B (5250 mL) is correct because cardiac output is calculated by multiplying heart rate by stroke volume: 75 beats/min * 70 mL/beat = 5250 mL/min.

133 Medium

133 of 335

Remembering +4 | -1

Hepatic portal system is a

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Correct option: A

Vascular connection between the digestive tract and liver

Option A (Vascular connection between the digestive tract and liver) is correct because the hepatic portal system is a specialized vascular pathway that transports blood from the digestive tract to the liver.

134 Easy

134 of 335

Understanding +4 | -1

A vein possesses a large lumen because

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Correct option: D

Tunica media is a thin coat

Option D (Tunica media is a thin coat) is correct because veins have a thinner tunica media compared to arteries, contributing to their larger lumen.

135 Medium

135 of 335

Remembering +4 | -1

Maximum surface area of circulating system is seen in

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Correct option: B

Capillaries

Option B (Capillaries) is correct because capillaries have the largest total surface area in the circulatory system due to their vast number and small size.

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136 Easy

136 of 335

Remembering +4 | -1

RBCs have an average life span of

View answer and explanation

Correct option: C

120 days

Option C (120 days) is correct because the average lifespan of red blood cells (RBCs) in humans is approximately 120 days.

137 Medium

137 of 335

Understanding +4 | -1

A blockage in aortic valve would directly reduce blood flow to the ______.

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Correct option: C

Lungs

Option A (Heart) is incorrect. Option C (Lungs) is correct because the aortic valve controls blood flow from the left ventricle into the aorta, which supplies oxygenated blood to the systemic circulation. A blockage would reduce blood flow to the body's organs, including the lungs.

138 Easy

138 of 335

Understanding +4 | -1

The systemic circulation provides nutrients, …A… and other essential substances to the …B… and takes …C… and other harmful substances away for elimination
Choose the correct option for A, B, C and D

View answer and explanation

Correct option: B

A-

{O_2}

, B-tissue, C-

C{O_2}

Option B (A-

{O_2}

, B-tissue, C-

C{O_2}

) is correct because systemic circulation delivers oxygen to the tissues and removes carbon dioxide from them.

139 Easy

139 of 335

Remembering +4 | -1

Which of the following acts as ‘middle man of the body’?

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Correct option: B

Lymph

Option B (Lymph) is correct because lymph acts as an intermediary fluid, transporting nutrients, oxygen, and waste products between blood and tissues.

140 Hard

140 of 335

Remembering +4 | -1

Foramen ovale is one of the shunts in foetus which connects

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Correct option: B

Right and left atria

Option B (Right and left atria) is correct because the foramen ovale is a shunt present in the fetal heart that connects the right and left atria, allowing blood to bypass the fetal lungs.

141 Easy

141 of 335

Understanding +4 | -1

Find out the wrong match

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Correct option: D

Monocytes – Secrete heparin

Option D is correct because monocytes differentiate into macrophages, which are phagocytic cells, and basophils secrete heparin.

142 Medium

142 of 335

Remembering +4 | -1

The blood does not clot inside the body because of

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Correct option: C

Heparin in blood

Option C (Heparin in blood) is correct because heparin is an anticoagulant that prevents blood from clotting inside the body.

143 Easy

143 of 335

Remembering +4 | -1

First heart sound is

View answer and explanation

Correct option: B

Lubb sound at the beginning of ventricular systole

Option B (Lubb sound at the beginning of ventricular systole) is correct because the first heart sound, "Lubb", occurs at the start of ventricular systole due to the closure of the atrioventricular valves.

144 Easy

144 of 335

Understanding +4 | -1

Neural signals through the sympathetic nerves (ANS) can increase the rate of heart beat by

View answer and explanation

Correct option: C

Both (a) and (b)

Option C (Both (a) and (b)) is correct because sympathetic nerve stimulation increases both cardiac output and the strength of ventricular contraction, leading to an increased heart rate.

145 Easy

145 of 335

Remembering +4 | -1

The second step in the coagulation of blood is catalyzed by

View answer and explanation

Correct option: A

Thrombin

Option A (Thrombin) is correct because thrombin catalyzes the conversion of fibrinogen to fibrin, which is the second major step in blood coagulation.

146 Easy

146 of 335

Remembering +4 | -1

CAD stands for

View answer and explanation

Correct option: C

Coronary Artery Disease

Option C (Coronary Artery Disease) is correct because CAD is the abbreviation for Coronary Artery Disease.

147 Medium

147 of 335

Remembering +4 | -1

Normal activities of the heart are regulated

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Correct option: B

Intrinsically

Option B (Intrinsically) is correct because the heart's normal activities are primarily regulated by its intrinsic mechanisms, such as the sinoatrial (SA) node.

148 Hard

148 of 335

Understanding +4 | -1

Statement-A : First heart sound is Lub.
Statement-B : Dub sound is produced due to closure of semilunar valves.

View answer and explanation

Correct option: D

Both statements are correct

Option D (Both statements are correct) is correct because the first heart sound (Lub) is produced by the closure of the tricuspid and bicuspid valves, and the second heart sound (Dub) is produced by the closure of the semilunar valves.

149 Medium

149 of 335

Understanding +4 | -1

An Rh -ve female, conceive twin boys in her first pregnancy. What is the probability of suffering from erythroblastosis foetalis in this first pregnancy by the Rh + ve foetus?

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Correct option: C

0 per cent

Option C (0 per cent) is correct because erythroblastosis foetalis typically occurs in subsequent pregnancies after the mother has been sensitized to the Rh antigen. In the first pregnancy, the mother is not yet sensitized, even with twins.

150 Medium

150 of 335

Remembering +4 | -1

Select the lymphoid organs from the given choices
I. Lymph node II. Thymus gland
III. Red bone marrow IV. liver
V. Spleen VI. Osteocytes
VII. Peyer’s patches
The correct option with correct choices is

View answer and explanation

Correct option: D

I, II, IV, V and VII

Option D (I, II, IV, V and VII) is correct because lymph nodes, thymus gland, liver, spleen, and Peyer’s patches are all lymphoid organs involved in the immune system.

Revision notes and key takeaways

Review BODY FLUIDS AND CIRCULATION in your textbook or class notes, then use this set to check your understanding.

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Body fluids and circulation practice · Mixed difficulty

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