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NEET • BIOLOGY • BODY FLUIDS AND CIRCULATION

Body fluids and circulation practice · Mixed difficulty

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Showing 151-180 of 335 questions

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151 Easy

151 of 335

Understanding +4 | -1

All of the following animals possess 3-chambered heart with two atria and a single ventricle, except

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Correct option: B

Crocodiles

Option B (Crocodiles) is correct because crocodiles possess a 4-chambered heart, unlike other reptiles and amphibians which have 3-chambered hearts.

152 Medium

152 of 335

Remembering +4 | -1

The structure of which of the following consists of a layer of single cell thickness?

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Correct option: A

Blood capillary

Option A (Blood capillary) is correct because blood capillaries are composed of a single layer of endothelial cells, facilitating efficient exchange.

153 Hard

153 of 335

Remembering +4 | -1

In cardiac cycle maximum time is taken by

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Correct option: B

Atria diastole

Option B (Atria diastole) is correct because the atria spend the longest portion of the cardiac cycle in diastole (relaxation and filling).

154 Medium

154 of 335

Remembering +4 | -1

Irregular nuclei is present in

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Correct option: B

basophils

Option A (Neutrophils) is incorrect because Neutrophils have multi-lobed nuclei, which can appear irregular.

155 Easy

155 of 335

Understanding +4 | -1

Pick out the incorrectly matched pair from the following

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Correct option: C

Lymph – Contains RBC and proteins

Option C (Lymph – Contains RBC and proteins) is the incorrectly matched pair because lymph does not contain RBCs.

156 Hard

156 of 335

Remembering +4 | -1

Left systemic arch is absent in

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Correct option: C

Birds only

Option C (Birds only) is correct because birds only have a right systemic arch, while mammals only have a left systemic arch.

157 Easy

157 of 335

Remembering +4 | -1

Water circulatory system in found in
I. Sponge II. Hydra
III. Annelida IV. Starfish
V. Arthropoda
Choose the correct option

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Correct option: C

I, II and IV

Option C (I, II and IV) is correct because sponges, hydra and starfish have water circulatory systems.

158 Medium

158 of 335

Understanding +4 | -1

Maximum pressure of blood experienced during when blood enters from

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Correct option: C

Left ventricle to aorta

Option C (Left ventricle to aorta) is correct because the left ventricle generates the highest pressure to pump blood into the systemic circulation via the aorta.

159 Medium

159 of 335

Understanding +4 | -1

Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature?

a) They do not need to reproduce

b) They are somatic cells

c) They do not metabolize

d) All their internal space is available for oxygen transport

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Correct option: B

Only (d)

Option B (Only (d)) is correct because the primary reason for the lack of a nucleus in adult human RBCs is to maximize space for oxygen transport.

160 Easy

160 of 335

Remembering +4 | -1

Haemolymph is the term used for the blood of the organism having

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Correct option: C

Open circulatory system

Option C (Open circulatory system) is correct because haemolymph is the fluid found in organisms with open circulatory systems.

161 Medium

161 of 335

Remembering +4 | -1

Persons with _____ and _______ blood groups are called universal recipient and universal donors respectively

View answer and explanation

Correct option: D

A{B^ + },\,\,{O^ - }

Option D (

A{B^ + },\,\,{O^ - }

) is correct because

AB^+

individuals can receive blood from any blood type, and

O^-

individuals can donate blood to any blood type.

162 Medium

162 of 335

Remembering +4 | -1

To obtain a standard ECG, the patient is connected to the machine with three electrical leads. These three electrical lead are connected as one each to the

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Correct option: D

Wrist and third one at the ankle

Option D (Wrist and third one at the ankle) is correct because standard ECG leads are placed on the wrists and one ankle to measure electrical activity of the heart.

163 Medium

163 of 335

Remembering +4 | -1

Lymphatic system is an elaborated network of vessels which collect the

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Correct option: A

Interstitial fluid

Option A (Interstitial fluid) is correct because the lymphatic system collects interstitial fluid, which is the fluid surrounding cells, and returns it to the bloodstream.

164 Easy

164 of 335

Remembering +4 | -1

All vertebrates posseses a …A… . Fishes have a …B… chambered heart with atrium and ventricles. Amphibians and reptiles have a …C… chambered heart. Bird and mammals have …D… chambered of heart
Choose the correct option

View answer and explanation

Correct option: B

A-muscular chambered heart, B-2, C-3, D-4

Option B (A-muscular chambered heart, B-2, C-3, D-4) is correct because all vertebrates have a muscular chambered heart, fishes have a 2-chambered heart, amphibians and reptiles have a 3-chambered heart, and birds and mammals have a 4-chambered heart.

165 Easy

165 of 335

Understanding +4 | -1

In the ventricular diastole, the …A… valve closes. This causes the second heart sound …B… . Choose the correct option for A and B

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Correct option: A

A-Semilunar; B-Dub

Option A (A-Semilunar; B-Dub) is correct because the semilunar valves close during ventricular diastole, producing the second heart sound, "Dub".

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166 Easy

166 of 335

Remembering +4 | -1

Immunity is provided by

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Correct option: B

lymphocytes

Option B (lymphocytes) is correct because lymphocytes are the primary cells responsible for providing immunity through antibody production and cell-mediated responses.

167 Medium

167 of 335

Understanding +4 | -1

In reptiles and amphibians, there is no clear cut separation of oxygenated and deoxygenated blood because they have

View answer and explanation

Correct option: B

Only one ventricle

Option B (Only one ventricle) is correct because the single ventricle in reptiles and amphibians allows for mixing of oxygenated and deoxygenated blood, leading to incomplete separation.

168 Medium

168 of 335

Remembering +4 | -1

Atherosclerosis is caused by deposition of

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Correct option: D

All of the above

Option D (All of the above) is correct because atherosclerosis involves the deposition of calcium, fat, cholesterol, and fibrous tissue in the arteries.

169 Easy

169 of 335

Understanding +4 | -1

The important function of lymph is to

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Correct option: A

Transport oxygen to the brain

Option D (Return interstitial fluid to the blood) is correct because the primary function of lymph is to return excess interstitial fluid and leaked proteins to the bloodstream.

170 Medium

170 of 335

Understanding +4 | -1

Properties of human RBCs are
I. devoid of nucleus
II. formed in bone marrow
III. possess healing properties
IV. biconcave in shape
V. help in blood clotting
Choose the option with correct properties

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Correct option: B

I, II and IV

Option B (I, II and IV) is correct because human RBCs are devoid of a nucleus, formed in bone marrow, and biconcave in shape.

171 Medium

171 of 335

Understanding +4 | -1

Choose the correct statement about SA node
I. Located at lateral wall of the right atrium
II. Herat of heart
III. It initiates the rhythmic contractile activity of the heart and maintains it
IV. It is called pace keeper of the heart
V. It is called pace maker of the heart
The option with correct statements is

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Correct option: B

All except IV

Option C (All except V) is correct because the SA node is the pacemaker, not the pace keeper, of the heart.

172 Easy

172 of 335

Remembering +4 | -1

In higher vertebrates, SA-node helps in

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Correct option: B

Initiation of heart beat

Option B (Initiation of heart beat) is correct because the SA-node is the heart's natural pacemaker, responsible for initiating the heartbeat.

173 Hard

173 of 335

Understanding +4 | -1

[A]: Perfluorocarbon can act as the substitute of blood.

[R]: Perfluorocarbon has some properties of blood.

View answer and explanation

Correct option: A

Both A and R are true and R is the correct explanation of A

Option A (Both A and R are true and R is the correct explanation of A) is correct because perfluorocarbons can act as blood substitutes due to their oxygen-carrying capacity and other blood-like properties.

174 Easy

174 of 335

Understanding +4 | -1

Bicuspid and tricuspid valve opens when

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Correct option: B

Blood from the pulmonary vein and vena cava flows into left and right ventricles, respectively

Option B (Blood from the pulmonary vein and vena cava flows into left and right ventricles, respectively) is correct because the bicuspid and tricuspid valves open to allow blood to flow from the atria into the ventricles.

175 Medium

175 of 335

Remembering +4 | -1

During cardiac cycle, about …A…% of ventricular filling occurs, prior to the arterial contraction …B…% ventricular filling occurs due to arterial contraction
Choose the correct option for A and B

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Correct option: B

A-70; B-30

Option B (A-70; B-30) is correct because approximately 70% of ventricular filling occurs before atrial contraction, and the remaining 30% is due to atrial contraction.

176 Easy

176 of 335

Understanding +4 | -1

Identify the wrong statement with reference to ABO system of blood groups.

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Correct option: D

Antigen “O” is present on the surface of RBCs of “O” group persons but no antibodies in plasma.

Option D is the wrong statement because blood group O has no antigens on the surface of RBCs, but it does have both anti-A and anti-B antibodies in the plasma.

177 Medium

177 of 335

Understanding +4 | -1

In complete double circulation :

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Correct option: C

There are two separate circulatory pathways.

Option C (There are two separate circulatory pathways) is correct because complete double circulation involves separate pulmonary and systemic circuits, ensuring oxygenated and deoxygenated blood do not mix.

178 Medium

178 of 335

Application +4 | -1

If the stroke volume is 70 mL and heart rate is 72 per min. What is cardiac output?

View answer and explanation

Correct option: B

5040 \mathrm{~mL}

Option B (

5040 \mathrm{~mL}

) is correct because cardiac output is calculated by multiplying heart rate by stroke volume: 72 beats/min * 70 mL/beat = 5040 mL/min.

179 Medium

179 of 335

Application +4 | -1

Which parental phenotypes would produce offspring with blood group phenotypes in the expected ratio of 1 type A : 1 type B?

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Correct option: D

Blood group of mother - AB; Blood group of father - O

Option D (Blood group of mother - AB; Blood group of father - O) is correct because the cross between AB (IAIB) and O (ii) parents yields offspring with genotypes IAi (type A) and IBi (type B) in a 1:1 ratio.

180 Medium

180 of 335

Remembering +4 | -1

Which one of the following is necessary to start clotting of blood?

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Correct option: C

Thromboplastin and

C{a^{2 + }}

Option C (Thromboplastin and

C{a^{2 + }}

) is correct because Thromboplastin initiates the clotting cascade, and Calcium ions (

C{a^{2 + }}

) are essential cofactors for many steps in the coagulation process.

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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