TestUstad

Free Circulation MCQs with Answers

695 Circulation MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.

Last updated

Human HeartCardiac Cycle and HeartbeatBlood VesselsLymphatic System
Read the Circulation notesFree MDCAT chapter notes with key terms

695 questions · page 9 of 35

161. The beating of the heart in a human being is heard on the left side because:

  • A. Both the atria are towards the left side
  • B. Bigger ventricle is towards the left side
  • C. Entire heart is on the left side
  • D. The aorta is on the left side

Explanation: Option B: This option is the correct answer. It states that the beating of the heart is heard on the left side because the bigger…

Read the full explanation →
Correct answer: Bigger ventricle is towards the left side

162. The thickest chamber of the human heart is:

  • A. Left atrium
  • B. Right atrium
  • C. Right ventricle
  • D. Left ventricle

Explanation: The left ventricle of your heart is larger and thicker than the other chambers.

Read the full explanation →
Correct answer: Left ventricle

163. The number of stages involved in a heart beat is:

  • A. 2
  • B. 3
  • C. 4
  • D. 5

Explanation: Every single heartbeat includes three major stages: atrial systole, ventricular systole, and complete cardiac diastole.

Read the full explanation →
Correct answer: 3

164. The number of efferent lymph vessels in a lymph node is:

  • A. 1
  • B. 2
  • C. 3
  • D. Numerous

Explanation: Efferent lymph vessels are the vessels that carry lymph away from a lymph node.

Read the full explanation →
Correct answer: 1

165. The police---- released any information about the case.

  • A. have
  • B. had
  • C. hasn't
  • D. haven't

Explanation: The correct answer is haven't, which is a contraction of 'have not.' This choice agrees with the plural subject 'The police' and conveys…

Read the full explanation →
Correct answer: haven't

166. Spot the error.The other is the world of faith, of the development of Mao thought throughout China, with little Red Book.

  • A. The other
  • B. World
  • C. The development
  • D. Little Red Book

Explanation: "Little Red Book" is missing the definite article "the." It should be "the Little Red Book." There is an error here.The error in the…

Read the full explanation →
Correct answer: Little Red Book

167. Each sentence below has a blank indicating that something has been omitted. Choose the word that best fits in with the meaning of the sentence as a whole.Competitors should arrive two weeks earlier to get _ to the sweltering heat.

  • A. Interposed
  • B. Acclimated
  • C. Dictated
  • D. Constructed

Explanation: "Acclimated" is correct because it means becoming accustomed or adapted to a new climate or environment, which fits the context of…

Read the full explanation →
Correct answer: Acclimated

168. Find the error in the following sentence of punctuationIn each question in the following, four alternative sentences are given. Choose the CORRECT one and fill the circle corresponding to that letter in the answer sheet.

  • A. When I noticed that our dog cut it's paw, I called the veterinarian right away.
  • B. When I noticed that our dog cut it's paw. I called the veterinarian right away.
  • C. When I noticed that our dog cut its paw, I called the veterinarian right away.
  • D. When I noticed that our dog cut its paw; I called the veterinarian right away.

Explanation: It uses the correct possessive form "its" and properly uses a comma to separate the dependent clause "When I noticed that our dog cut its…

Read the full explanation →
Correct answer: When I noticed that our dog cut its paw, I called the veterinarian right away.

169. In this section of logical deduction, the question consists of a brief passage (usually a report containing certain data regarding some social or economic problem), followed by certain inferences based on it. The student is required to analyze the contents (or data) of the passage and grasp the desirable facts from it. Then, student has to consider each of the given inferences in the context of the given passage. decide upon its degree of truth or falsity and then choose the hest alternative provided accordingly.A tiger, when killing its natural prey, which it does either by stalking or lying-in wait for it, depends for the success of its attack on its speed and, to a lesser extent, on the condition of its teeth and claws. When, therefore, a tiger is suffering from one or more painful wounds or when its teeth are missing or defective and its claws worn down, and it is unable to catch animals it has been accustomed to eating, it is driven by the necessity to killing human beings.Sharp claws are needed by the tigers to kill animals in the forest.

  • A. Definitely true
  • B. Probably true
  • C. Data inadequate
  • D. Probably false
  • E. Definitely false

Explanation: The passage explicitly mentions that a tiger's success in killing its prey relies on its speed and, to a lesser extent, the condition of…

Read the full explanation →
Correct answer: Definitely true

170. Directions: In the following question, a number sequence is given with one term missing. Choose the correct term that will continue the same pattern and replace the question mark in the given sequence.9,11,17,35,89,?

  • A. 143
  • B. 197
  • C. 250
  • D. 251

Explanation: To solve the sequence, observe the differences between consecutive terms:11 - 9 = 217 - 11 = 635 - 17 = 1889 - 35 = 54The sequence of…

Read the full explanation →
Correct answer: 251

171. Directions: Read the following information and give answer.H, Q, C, L, N and F are six members of a family. There are two married couples among them. C is the mother of H and F.N is the father of L.H is the grandson of Q. The total number of female members in the family is three.How is Q related to F?

  • A. Sister
  • B. Grandmother
  • C. Wife
  • D. Data insufficient

Explanation: From the given information: C is the mother of H and F, and Q is the mother of C.

Read the full explanation →
Correct answer: Grandmother

172. In the following question, two statements numbered I and II are given. There may be cause and effect relationship between the two statements. These two statements may be the effect of the same cause or independent causes. These statements may be independent causes without saving any relationship. Read both the statements in question and mark your answer as:A. If statement I is the cause and statement II is its effect;B. If statement II is the cause and statement, I is its effect;C. If both the statements I and II are independent causes;D. If both the statements I and II are effects of independent causes;E. If both the statements I and II are effects of some common causes;I. Stefan's English-speaking power is very less.II. Stefan has decided to join Saint Pants English coaching class.

  • A. A. If statement I is the cause and statement II is its effect;
  • B. B. If statement II is the cause and statement I is its effect;
  • C. C. If both the statements I and II are independent causes;
  • D. D. If both the statements I and II are effects of independent causes;
  • E. E. If both the statements I and II are effects of some common causes;

Explanation: The correct answer is option A. Stefan's limited English-speaking skills (statement I) logically lead him to join an English coaching…

Read the full explanation →
Correct answer: A. If statement I is the cause and statement II is its effect;

173. In this question, a statement is given followed by two courses of action numbered I and II. It is required to grasp the statement, analyze the problem or policy it mentions and then decide which of the courses of action logically follow / most appropriate.Statement:Many cases of cholera were reported from a nearby village.Courses of action:I) The question should be raised in the Legislative Assembly.II) A team of doctors should be rushed to the village.

  • A. If only I follows
  • B. If only II follows
  • C. If either I or II follows
  • D. If neither I nor II follows
  • E. If both I and II follow

Explanation: The correct answer is Option B: If only II follows. The statement indicates an urgent health crisis due to cholera.

Read the full explanation →
Correct answer: If only II follows

174. The Lymph vessel of the villi is called

  • A. Lacteal
  • B. Epithelium
  • C. Adenoids
  • D. Afferent lymph vessel

Explanation: The lymph vessel within the villi of the small intestine is called a lacteal. It plays a role in absorbing dietary fats.

Read the full explanation →
Correct answer: Lacteal

175. The diagram represents two liquids, separated by a membrane through which osmosis can occur. What movement of molecules will occur?

  • A. Molecules of dissolved substance move from left to right.
  • B. Molecules of dissolved substance move from right to left.
  • C. Overall, water molecules move from left to right.
  • D. Overall, water molecules move from right to left.
  • E. None of the above

Explanation: Water molecules move from the left to right as water potential is higher on the left side than the right side.

Read the full explanation →
Correct answer: Overall, water molecules move from left to right.

176. How many ml of blood is pumped by each contraction of the heart?

  • A. 80 ml
  • B. 90 ml
  • C. 70 ml
  • D. 60 ml

Explanation: Cardiac output is the volume of blood being pumped by the heart in a minute.

Read the full explanation →
Correct answer: 70 ml

177. The causes of Cyanosis include:

  • A. Deficiency of vitamin C
  • B. Varicella-zoster virus
  • C. Degeneration of the cartilage of joints
  • D. Ventricular septum defect
  • E. None of these options

Explanation: Cyanosis occurs when oxygen-depleted (deoxygenated) blood, which is bluish rather than red, circulates through the skin.

Read the full explanation →
Correct answer: Ventricular septum defect

178. Which valve action results from an increase in pressure in the ventricles of the heart?

  • A. The closing of all the heart valves
  • B. The closing of semilunar valves
  • C. The opening of the bicuspid valve
  • D. The opening of the semilunar valves
  • E. The opening of the tricuspid valve

Explanation: When the pressure of the ventricles increases, the bicuspid and tricuspid valves close and semilunar valves open.

Read the full explanation →
Correct answer: The opening of the semilunar valves

179. Consider the following statements regarding blood pressure:1. It is the pressure exerted by the blood on the walls of any vessel.2. It decreases in the arteries as the distance from the heart increases.3. It is lower in the capillaries than in the arteries.4. It is usually lower in women than in men.Choose the correct statements.

  • A. 1, 2 and 3 are correct.
  • B. 2, 3 and 4 are correct.
  • C. 1 and 4 are correct.
  • D. 1, 2, 3 and 4 are correct.

Explanation: Blood pressure (BP) is the pressure of circulating blood on the walls of blood vessels.

Read the full explanation →
Correct answer: 1, 2, 3 and 4 are correct.

180. The table shows the characteristics of the blood in one blood vessel in the body. Which blood vessel contains blood with these characteristics?

  • A. Aorta
  • B. Pulmonary Artery
  • C. Pulmonary Vein
  • D. Vena cava

Explanation: Aorta has high oxygen conc and low CO2 conc with high pressure. Vena cava and pulmonary arteries have low O2 conc and high CO2 conc,so…

Read the full explanation →
Correct answer: Aorta
Start Free Circulation Practice MCQs Test