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 10 of 35
- A. Active immunity
- B. Artificially induced active immunity
- C. Passive immunity
- D. Naturally induced active immunity
Explanation: The scenario describes 'active immunity'. 'Active immunity' is when the body itself gets exposed to the antigen to generate an immune…
Correct answer: Naturally induced active immunity- A. Phagocytes
- B. Complement Proteins
- C. Cytokines
- D. Atherosclerosis
Explanation: Atherosclerosis is a disease caused by high levels of cholesterol in the blood.
Correct answer: Atherosclerosis- A. Pulmonary artery
- B. Hepatic artery
- C. Celiac artery
- D. Thoracic artery
Explanation: Hepatic artery supplies blood to the liver.
Correct answer: Hepatic artery- A. Due to the less negative water potential of the external environment than the cell.
- B. Due to the more negative water potential of the external environment that the cell
- C. Due to the less positive water potential of the external environment than the cell
- D. Due to more positive water potential of the external environment than the cell
Explanation: Water potential becomes more negative with solutes (salt) (less negative with purity).
Correct answer: Due to the more negative water potential of the external environment that the cell- A. Simple diffusion
- B. Facilitated diffusion
- C. Osmosis
- D. Primary active transport
- E. Secondary active transport
Explanation: The transport of glucose requires special carrier proteins to take place since glucose is a very large polar molecule that cannot simply…
Correct answer: Facilitated diffusion- A. Monocytes
- B. Neutrophils
- C. Lymphocytes
- D. Thrombocytes
Explanation: Lymphocytes play a very important role in developing immunity (long-term) unlike other cells like monocytes and neutrophils, which are…
Correct answer: Lymphocytes- A. Apical growth increases the length of stems and roots
- B. Xylem is situated on the outer side of the cambium ring and the phloem on the inner side
- C. Secondary growth increases the diameter of stems and roots
- D. The cells in the elongation phase don't divide
- E. The cells informative regions are closely packed together
Explanation: In a vascular cambium, the xylem is placed on the inner side while the phloem is placed on the outer side, option B states vice versa.
Correct answer: Xylem is situated on the outer side of the cambium ring and the phloem on the inner side188. Arteriosclerosis is:
- A. A metabolic disorder
- B. A degenerative disorder
- C. An infectious disorder
- D. A nutritional deficiency disorder
Explanation: Arteriosclerosis is a disorder in which cholesterol and fat buildup in arteries cause their narrowing or blockage which leads to damaged…
Correct answer: A degenerative disorder- A. Thymus glands
- B. Bone marrow
- C. Pancreas
- D. Heart
Explanation: T cells originate from hematopoietic stem cells which are produced in the bone marrow.
Correct answer: Bone marrow- A. Glycoprotein
- B. Glycolipids
- C. Lipoproteins
- D. Polysaccharides
Explanation: Option A is correct as antibodies can be described as glycoproteins, compounds that consist of carbohydrates and proteins.
Correct answer: Glycoprotein- A. Haemorrhage
- B. Haematoma
- C. Hepatoma
- D. Haemocoel
- E. Haematemesis
Explanation: The massive accumulation of blood within a tissue is called a hematoma.
Correct answer: Haematoma- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Since Y represents concentrated sucrose, it means it has higher amount of sucrose.
Correct answer: Option B- A. Aorta
- B. Kidneys
- C. Liver
- D. Lungs
Explanation: Blood circulating from the gut to the heart has to pass through the liver, it is a must (Portal system).
Correct answer: Liver- A. Muscular System
- B. Endocrine System
- C. Nervous System
- D. Immune System
Explanation: The system that is responsible for fighting the pathogens in the human body is called the immune system.
Correct answer: Immune System- A. Erythrocytes
- B. Basophils
- C. Eosinophils
- D. Leucocytes
Explanation: Leukemia is a type of cancer that affects the blood and bone marrow, leading to the overproduction of abnormal white blood cells.
Correct answer: Leucocytes- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: As the left atrium has oxygenated blood and the right has deoxygenated blood, as blood moves to the right atrium % oxygen will increase in…
Correct answer: Option D- A. Diffusion
- B. Facilitated diffusion
- C. Passive transport
- D. Osmosis
Explanation: Diffusion is the passive movement of molecules down the concentration gradient whereas osmosis is the passive movement of water down the…
Correct answer: Facilitated diffusion- A. Plasmodesmata
- B. Endodermis
- C. Cortex
- D. Pith
Explanation: The cell-to-cell pathway is a continuous flow domain interrupted at the endodermis, which has a cell membrane with lower specific…
Correct answer: Endodermis- A. Atria
- B. Pulmonary valve
- C. Ventricles
- D. Aortic valve
Explanation: The chordae tendinae (tendinous cords), colloquially known as the heartstrings, are tendon-resembling fibrous cords of connective tissue…
Correct answer: Ventricles- A. Femoral
- B. Pulmonary
- C. Renal
- D. Iliac
Explanation: The pulmonary veins carry oxygenated blood from the lungs to the left atrium of the heart.
Correct answer: Pulmonary