A protein produced by Hordeum vulgare, which is rich in lysine

A toxic molecule isolated from Gossypium hirsutum, which reduces human fertility

An antibiotic produced by a genetically engineered bacterium, Escherichia coli

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NEET • BIOLOGY • BODY FLUIDS AND CIRCULATION

Body fluids and circulation practice · Mixed difficulty

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Showing 211-240 of 335 questions

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211 Hard

211 of 335

Understanding +4 | -1

Which of the following will result in decreased heart rate?

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Correct option: D

Parasympathetic nervous system

Option D (Parasympathetic nervous system) is correct because it releases acetylcholine, which slows down the heart rate.

212 Hard

212 of 335

Understanding +4 | -1

Read the following statements and select the most appropriate option.
(a) Nodal tissue present in the right upper corner of the right atrium is called AV node.
(b) The nodal musculature is autoexcitable.
(c) The AVN is responsible for initiating and maintaining the rhythmic contractile activity of the heart.

View answer and explanation

Correct option: D

Only statement (b) is true

Option D (Only statement (b) is true) is correct because the nodal musculature is indeed autoexcitable, while the AV node is not in the right upper corner and does not initiate the rhythmic contractile activity.

213 Easy

213 of 335

Understanding +4 | -1

Narrowing of lumen of arteries caused due to deposition of calcium, fat, cholesterol and fibrous tissue that affects blood supply to the myocardium of heart is called

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Correct option: B

Atherosclerosis

Option B (Atherosclerosis) is correct because it is the narrowing of arteries due to the deposition of calcium, fat, cholesterol, and fibrous tissue.

214 Medium

214 of 335

Understanding +4 | -1

Cause of closure of semilunar valves in human heart is

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Correct option: C

Ventricular diastole and decrease in ventricular pressure

Option C (Ventricular diastole and decrease in ventricular pressure) is correct because the semilunar valves close when the ventricles relax (diastole) and the pressure in the ventricles drops below the pressure in the arteries.

215 Easy

215 of 335

Remembering +4 | -1

ECG is a measure of

View answer and explanation

Correct option: B

Difference in electric potential

Option B (Difference in electric potential) is correct because an ECG measures the electrical potential differences generated by the heart.

216 Easy

216 of 335

Understanding +4 | -1

Choose the correct pathway on the transmission of impulse in the heart beat.

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Correct option: B

SA-node → AV-node → Bundle of His → Purkinje fibres

Option B (SA-node → AV-node → Bundle of His → Purkinje fibres) is correct because it represents the correct sequence of impulse transmission in the heart.

217 Medium

217 of 335

Understanding +4 | -1

The wall of the ventricles are much thicker than that of atrium because

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Correct option: A

It has to pump the blood

Option A (It has to pump the blood) is correct because the ventricles need thicker walls to generate the force required to pump blood to the lungs and the rest of the body.

218 Medium

218 of 335

Application +4 | -1

In a cardiac output of 5250 ml per minute, with 75 heart beats per minute, the stroke volume is

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Correct option: D

70 ml

Option D (70 ml) is correct because stroke volume is calculated by dividing cardiac output by heart rate: 5250 ml/min / 75 beats/min = 70 ml/beat.

219 Medium

219 of 335

Remembering +4 | -1

Chordae tendinae are found in

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Correct option: B

Ventricles of heart

Option B (Ventricles of heart) is correct because chordae tendinae are fibrous cords that connect the atrioventricular valves to the papillary muscles in the ventricles.

220 Easy

220 of 335

Remembering +4 | -1

Lymphocytes (20-25%) are of two major types, B and T forms. They are responsible for

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Correct option: C

Immune responses

Option C (Immune responses) is correct because lymphocytes, specifically B and T cells, are the key cells responsible for adaptive immunity.

221 Easy

221 of 335

Remembering +4 | -1

Systolic pressure in adult human is

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Correct option: A

120 mm Hg

Option A (120 mm Hg) is correct because the normal systolic blood pressure in an adult human is approximately 120 mm Hg.

222 Medium

222 of 335

Understanding +4 | -1

In which, blood circulation starts and ends in capillaries?

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Correct option: A

Portal system

Option A (Portal system) is correct because a portal system is defined as a system where blood passes through two sets of capillaries before returning to the heart.

223 Medium

223 of 335

Application +4 | -1

Patient with unknown blood group needs immediate blood transfusion. In this case, which blood do you suggest to give that patient immediately?

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Correct option: D

Blood group-O

Option D (Blood group-O) is correct because blood group O is the universal donor and can be transfused to patients with unknown blood groups in emergencies.

224 Easy

224 of 335

Remembering +4 | -1

‘Hepatic Portal Vein’ carries blood from

View answer and explanation

Correct option: A

Intestine to Liver

Option A (Intestine to Liver) is correct because the hepatic portal vein specifically transports blood from the intestine to the liver for processing.

225 Medium

225 of 335

Understanding +4 | -1

In mammals, which blood vessel would normally carry largest amount of urea?

View answer and explanation

Correct option: C

Hepatic vein

Option C (Hepatic vein) is correct because the hepatic vein carries blood from the liver, which is where urea is produced as a byproduct of protein metabolism.

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226 Medium

226 of 335

Remembering +4 | -1

Which of the following carries glucose from digestive tract to liver?

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Correct option: B

Hepatic portal vein

Option B (Hepatic portal vein) is correct because the hepatic portal vein carries blood rich in nutrients, including glucose, from the digestive tract to the liver for processing and storage.

227 Easy

227 of 335

Remembering +4 | -1

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

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Correct option: B

whale

Option B (whale) is correct because whales, being mammals, have a double circulatory system with separate pulmonary and systemic pathways.

228 Medium

228 of 335

Remembering +4 | -1

Besides RBC, blood plasma also carries

{O_2}

in solution. The percentage is

View answer and explanation

Correct option: D

3\%

Option D (

3\%

) is correct because blood plasma carries a small percentage of oxygen in solution, with the majority being transported by hemoglobin in RBCs.

229 Easy

229 of 335

Remembering +4 | -1

In an ECG, the depolarization of atria is indicated by

View answer and explanation

Correct option: A

P-wave

Option A (P-wave) is correct because the P-wave on an ECG represents atrial depolarization.

230 Medium

230 of 335

Understanding +4 | -1

In human heart, identify the correct statements a I. Volume of both the atria is the greater than the volume and both ventricles II. Volume of both the ventricle is greater than the volume of both the atria III. Inter-ventricular septum separates the right and the left atria IV. Atrio ventricular septum don’t separates the atrium and ventricle Choose the correct option accordingly

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Correct option: B

 II only

Option B (II only) is correct because the volume of both ventricles is greater than the volume of both atria.

231 Medium

231 of 335

Remembering +4 | -1

Heart of man is

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Correct option: A

Myogenic

Option A (Myogenic) is correct because the human heart's contractions are initiated by specialized muscle cells (SA node) within the heart itself, not by nerve impulses.

232 Easy

232 of 335

Remembering +4 | -1

In ECG P – wave represents

View answer and explanation

Correct option: C

Depolarisation of Atria

Option C (Depolarisation of Atria) is correct because the P wave on an ECG represents the electrical activity associated with atrial depolarization.

233 Easy

233 of 335

Understanding +4 | -1

Serum differs from blood in

View answer and explanation

Correct option: D

lacking clotting factors

Option D (lacking clotting factors) is correct because serum is blood plasma from which the clotting factors have been removed, typically by allowing the blood to clot.

234 Medium

234 of 335

Understanding +4 | -1

Chordae tendinae

View answer and explanation

Correct option: C

Prevent the AV valves flaps from everting

Option C (Prevent the AV valves flaps from everting) is correct because chordae tendinae prevent the atrioventricular (AV) valve flaps from prolapsing back into the atria during ventricular contraction.

235 Hard

235 of 335

Remembering +4 | -1

Hirudin is:

View answer and explanation

Correct option: C

A protein produced from transgenic Brassica napus, which prevents blood clotting

Option C (A protein produced from transgenic Brassica napus, which prevents blood clotting) is correct because Hirudin is an anticoagulant protein that can be produced in transgenic Brassica napus (rapeseed) to prevent blood clotting.

236 Easy

236 of 335

Remembering +4 | -1

During the process of blood coagulation, vitamin-K helps in the

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Correct option: A

Formation of prothrombin

Option A (Formation of prothrombin) is correct because Vitamin K is essential for the synthesis of prothrombin, a key clotting factor, in the liver.

237 Medium

237 of 335

Understanding +4 | -1

Identify the correct statement

I. The impulse of the heart beat originates from SAN

II. Rate of the heart is determined by SAN

III. Bundle of His/AV bundle is present in the interventricular septum

IV. Atrio Ventricular Node (AVN) is situated in the lower left corner of the right auricle

Choose the correct option

View answer and explanation

Correct option: C

All except III

Option D (All except III) is correct because statements I, II, and IV are correct about the heart's electrical activity, while statement III incorrectly states the location of the Bundle of His.

238 Easy

238 of 335

Understanding +4 | -1

Assertion: Monocytes constitute only 6-8% of WBCs but are very essential.

Reason: These are phagocytic cells.

View answer and explanation

Correct option: A

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion

Option A (If both Assertion and Reason are correct and Reason is the correct explanation of Assertion) is correct because monocytes, though a smaller percentage of WBCs, are crucial phagocytic cells.

239 Hard

239 of 335

Understanding +4 | -1

In which of the following pairs, the two items mean one and the same thing?

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Correct option: B

SA node - Pace maker

Option B (SA node - Pace maker) is correct because the SA node and the pacemaker are synonymous terms referring to the heart's natural electrical impulse generator.

240 Medium

240 of 335

Understanding +4 | -1

If a person is loosing blood continuously due to injury then what will be the effect on his pulse and BP initially?

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Correct option: D

Pulse will rise and BP will fall.

Option D (Pulse will rise and BP will fall) is correct because the body attempts to compensate for blood loss by increasing heart rate (pulse) while blood pressure drops due to decreased blood volume.

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