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 28 of 35
- A. Hydrophytes
- B. Xerophytes
- C. Mesophytes
- D. Halophytes
Explanation: Xerophytes live in dry environments. They posess thick waxy cuticle over their epidermis to reduce water loss from internal tissues.
Correct answer: Xerophytes- A. Hydrophytes
- B. Mesophytes
- C. Xerophytes
- D. Sciophytes
Explanation: Xerophytes posess thick waxy cuticle over their epidermis to reduce water loss from internal tissues.
Correct answer: Xerophytes- A. Hydrophytes
- B. Mesophytes
- C. Sciophytes
- D. Xerophytes
Explanation: Xerophytes have few and sunken stomata in leaves. They have stomata on lower surfaces of leaves to hide them from sunlight, so they can…
Correct answer: Xerophytes- A. From the tissues of the body to blood
- B. From the tissues of the body to lymph
- C. From the tissue of the body to external environment
- D. From the respiratory system to blood
Explanation: Lymph or tissue fluid is actually a fluid of interstitial spaces i.e. it oozes out from the blood in interstitial spaces then collected…
Correct answer: From the tissues of the body to blood- A. Transport system
- B. Blood vascular system
- C. Lymphatic system
- D. Immune system
Explanation: The system that is responsible for the transport and returning of materials from the tissues of the body to the blood is called lymphatic…
Correct answer: Lymphatic system- A. Interstitial fluid
- B. Extracellular fluid
- C. Intracellular fluid
- D. Interstitial or extracellular fluid
Explanation: Lymph capillaries or lymphatic capillaries are tiny, thin walled vessels located in the spaces between cells (except in the central…
Correct answer: Interstitial or extracellular fluid- A. Lymph
- B. Blood
- C. Tissue fluid
- D. Body fluid
Explanation: Lymph is the fluid that circulates throughout the lymphatic system. The lymph is formed when the interstitial is collected through lymph…
Correct answer: Blood- A. Capillaries of blood vascular system
- B. Veins of blood vascular system
- C. Arteries of blood vascular system
- D. Vanae cavae
Explanation: Lymph capillaries are slightly larger in diameter than blood capillaries and have closed ends.Their unique structure permits interstitials…
Correct answer: Capillaries of blood vascular system- A. Lacteals
- B. Larger lymph vessels
- C. Smaller lymph vessels
- D. Venae cavae
Explanation: Lymph capillaries join to form larger and larger lymph vessels and ultimately form thoracic lymphatic duct which opens into sub-clavian…
Correct answer: Larger lymph vessels- A. Ileum
- B. Microvilli
- C. Villi
- D. Small intestine
Explanation: They are called lacteal because fluid inside them contains fats and appears milky (lactase-milk).
Correct answer: Villi- A. Lymphoid masses
- B. Lymph nodes
- C. Thymus
- D. Adenoid
Explanation: Several lymphoid masses are present in the walls of digestive tract, in the mucosa and sub-mucosa.
Correct answer: Lymph nodes- A. Many efferent lymph vessels
- B. Single efferent lymph vessels
- C. Many afferent lymph vessels
- D. Single afferent lymph vessels
Explanation: Several afferent lymph vessels bring lymph into lymph nodes whereas single efferent lymph vessel drains the lymph node.
Correct answer: Many afferent lymph vessels- A. Lymph nodes
- B. Lacteals
- C. Lymphoid masses
- D. Lymph vessels
Explanation: Several lymphoid masses are present in the walls of digestive tract, in the mucosa and sub-mucosa.
Correct answer: Lymphoid masses- A. 1000 ml
- B. 2000 ml
- C. 3000 ml
- D. 4000 ml
Explanation: In an average person, about three liters more fluid leaves the blood capillaries than is reabsorbed by them each day.
Correct answer: 3000 ml- A. Lymphoid masses
- B. Lymph nodes
- C. Lymphatic vessels
- D. Lymphatic ducts
Explanation: The lymphatic system helps defend the body against foreign invaders. Lymph nodes have lymphocytes and macrophages that destroy bacteria…
Correct answer: Lymph nodes556. The painful swelling of lymph nodes in certain diseases is largely a result of the accumulation of:
- A. Dead lymphocytes and microphages
- B. Dead lymphocytes and macrophages
- C. Living lymphocytes and microphages
- D. Living lymphocytes and macrophages
Explanation: The lymphatic system helps defend the body against foreign invaders. Lymph nodes have lymphocytes and macrophages that destroy bacteria…
Correct answer: Dead lymphocytes and macrophages- A. Thoracic cavity
- B. Chest cavity
- C. Pericardium
- D. Pleural cavity
Explanation: The heart of human is located in the chest cavity. The heart is enclosed in a double membranous sac the pericardial cavity, which contains…
Correct answer: Pericardium- A. Pericardium
- B. Epicardium
- C. Myocardium
- D. Endocardium
Explanation: Myocardium of the heart is made up of special type of muscles called cardiac muscles.
Correct answer: Myocardium- A. Myofibrils
- B. Myofilaments of actin
- C. Myofilaments of myosin
- D. Myofibrils and Myofilaments of actin and myosin
Explanation: The arrangement of cardiac muscle cells or fibres is similar to those in skeletal muscles fibre.
Correct answer: Myofibrils and Myofilaments of actin and myosin- A. Tricuspid valve
- B. Bicuspid valve
- C. Semilunar valve
- D. Sphincter valve
Explanation: The left atrioventicular valve present between the left atrium and ventricle is bicuspid, composed of two cusps.
Correct answer: Bicuspid valve