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.
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Read the Circulation notesFree MDCAT chapter notes with key terms695 questions · page 11 of 35
- A. Self against antigens
- B. Antigen against self
- C. Self against self
- D. Antigen self destroyed
Explanation: Autoimmune disease occurs when a specific adaptive immune response is mounted against self antigens(hence self mounts against self).
Correct answer: Self against self- A. The superior vena cava
- B. The inferior vena cava
- C. The coronary sinus
- D. The four pulmonary veins
Explanation: The Right Atrium receives deoxygenated blood from the Superior Vena Cava, Inferior Vena Cava and the Left Atrium receives blood from four…
Correct answer: The four pulmonary veins- A. T Lymphocytes
- B. Red Blood Cells
- C. Platelets
- D. B Lymphocytes
Explanation: Antibodies are produced by specialized white blood cells called B lymphocytes (or B cells).
Correct answer: B Lymphocytes- A. Connective tissues
- B. Elastic fibres
- C. Endothelial cells
- D. Smooth muscle cells
Explanation: Both arteries and capillaries contain endothelial cells in their walls.
Correct answer: Endothelial cells- A. Root hair
- B. Stomata
- C. Guard cells
- D. Cell wall
Explanation: Mineral salts enter the plant largely through its root hairs.
Correct answer: Root hair- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher…
Correct answer: Option D- A. Vaccination against smallpox
- B. Use of polio vaccine
- C. Passing of certain antibodies to the foetus by the pregnant women
- D. Inoculation of antitoxin in the case of puncture wound
- E. Both C and D
Explanation: Passive immunity is provided when a person is given antibodies to a disease rather than producing them through his or her own immune…
Correct answer: Both C and D- A. B-cells
- B. Killer cells
- C. Helper cells
- D. Null cells
Explanation: Humoral immunity is also called antibody-mediated immunity. B-cells differentiate into plasma B cells that can produce antibodies against…
Correct answer: B-cells- A. Tears
- B. Mucous membranes
- C. Ciliated cells
- D. White blood cells
- E. Red blood cells,
Explanation: Red blood cells are involved in the transport of O2 via haemoglobin stored in them from the lungs to the cells and tissues of the body.
Correct answer: Red blood cells,- A. Metabolism
- B. Respiration
- C. Reproduction
- D. Clotting
Explanation: Fibrinogen is primarily necessary for clotting. It is a glycoprotein that plays a crucial role in the process of blood coagulation or…
Correct answer: Clotting- A. Increased blood pressure
- B. Increased rate of heart
- C. Greater accumulation of tissue fluid
- D. Decreased filtration in glomerulus
Explanation: Increased blood pressure: This option is correct. An increase in plasma albumin can contribute to increased blood pressure.
Correct answer: Increased blood pressure- A. Lymphocytes
- B. RBCs
- C. T-cells
- D. B-cells
Explanation: HIV infects a type of white blood cell in the body's immune system called a T-helper cell (also called a CD4 cell).
Correct answer: T-cells- A. Red blood cells
- B. Platelets
- C. B-lymphocytes
- D. Hormones
Explanation: B-lymphocytes: B-lymphocytes, also called B-cells, are a type of white blood cell that plays a central role in the adaptive immune…
Correct answer: B-lymphocytes- A. Renal veins
- B. None
- C. Pulmonary artery
- D. Hepatic portal veins
Explanation: Pulmonary vein is the only vein in the human body that carries oxygenated blood.
Correct answer: None- A. Mineral salts to the leaves
- B. Organic nutrients from the leaves
- C. Oxygen to the roots
- D. Water to the leaves
Explanation: Organic nutrients such as sugar molecules are transported through phloem tubes,cutting off this tube cuts off this organic nutrients…
Correct answer: Organic nutrients from the leaves- A. Immune system
- B. Arterial wall
- C. Venal wall
- D. Lungs
Explanation: Atherosclerosis refers to the buildup of fats, cholesterol and other substances in and on your artery walls (plaque), which can restrict…
Correct answer: Arterial wall- A. No net movement of water
- B. Net movement of water into the cell
- C. Net movement of water out of the cell
- D. Bursting of the cell
Explanation: In an isotonic solution there is a movement of water into and out of the cell but no net movement of water into or out of the cell as they…
Correct answer: No net movement of water- A. Arteries
- B. Veins
- C. Capillaries
- D. None of the given options
Explanation: Generally, lymph flows away from the tissues to lymph nodes and eventually to either the right lymphatic duct or the largest lymph vessel…
Correct answer: Veins- A. At the base of the pulmonary trunk
- B. At the base of the aorta
- C. In veins
- D. In the coronary arteries
Explanation: Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.
Correct answer: In the coronary arteries- A. Arteries
- B. Veins
- C. Capillaries
- D. None of the given options
Explanation: The highest pressure of circulating blood is found in arteries, and gradually drops as the blood flows through the arterioles…
Correct answer: Arteries