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 20 of 35
- A. Cannabis
- B. Coca
- C. English yew
- D. Daffodil
Explanation: Galantamine Hydrobromide is a tertiary alkoid that has been extracted from plant sources and is now synthesized for use in the treatment…
Correct answer: Daffodil- A. Haemophilia - Blood cancer
- B. SA node - Pacemaker
- C. ECG - Brain
- D. Alpha cell - Insulin
Explanation: Haemophilia is a disorder and not blood cancer, EEG is only a test that detects abnormalities in your brain waves, or in the electrical…
Correct answer: SA node - Pacemaker- A. Platelets
- B. Cytotoxic T cells
- C. Antigens
- D. Red blood cell
Explanation: T cells are direct fighters of foreign invaders. Also called cytotoxic T cell and cytotoxic T lymphocyte.
Correct answer: Cytotoxic T cells- A. Heart
- B. Brain
- C. Skin
- D. Nephron
Explanation: The Purkinje fibers are located in the inner ventricular walls of the heart, just beneath the endocardium in a space called the…
Correct answer: Heart- A. Inactivated vaccine
- B. Toxoid vaccine
- C. Subunit vaccine
- D. Live, attenuated vaccine
Explanation: Toxoid vaccines contain a toxin or chemical made by the bacteria or virus.
Correct answer: Toxoid vaccine- A. Active immunity
- B. Passive immunity
- C. Acquired immunity
- D. Innate immunity
Explanation: During the last 3 months of pregnancy, antibodies from mothers are passed to their unborn babies through the placenta.
Correct answer: Innate immunity- A. 5-10 ft deep
- B. 10-15 ft deep
- C. 15-20 ft deep
- D. 20-25 ft deep
Explanation: The correct answer is b) 10-15 ft deep. This depth provides enough space for the efficient anaerobic digestion of organic waste and the…
Correct answer: 10-15 ft deep- A. Formation of carboxy-hemoglobin
- B. The high concentration of oxyhemoglobin
- C. Low level of CO
- D. Low level of hemoglobin
Explanation: Cyanosis indicates there may be decreased oxygen attached to red blood cells in the bloodstream such as due to the formation of…
Correct answer: Formation of carboxy-hemoglobin- A. 2
- B. 4
- C. 6
- D. 8
Explanation: Antibodies are protective proteins produced by your immune system. They attach to antigens (foreign substances) - such as bacteria, fungi…
Correct answer: 4- A. Increased rate of cell division
- B. Immunization with antigen
- C. To avoid contamination
- D. As nutrient in media
Explanation: Multiple myeloma cells are abnormal plasma cells (a type of white blood cell) that build up in the bone marrow and form tumors in many…
Correct answer: Immunization with antigen- A. Tracheids, vessels, elements
- B. Tracheids, Companion cells
- C. Vessels elements, companion cells
- D. Companion cell, sieve-tubes
Explanation: Phloem sieve-tube elements have reduced cytoplasmic contents, and are connected by a sieve plate with pores that allow for pressure-driven…
Correct answer: Companion cell, sieve-tubes- A. Neutrophils
- B. Macrophages
- C. Cytotoxic T cells
- D. Helper T cells
Explanation: Human immunodeficiency virus has certain characteristics: High selectivity.
Correct answer: Helper T cells- A. Hepatic vein
- B. Renal vein
- C. Subclavian vein
- D. Renal artery
Explanation: Oxygenated blood comes to the kidneys from the right and left renal arteries of the abdominal aorta.
Correct answer: Renal vein- A. Show involuntary control
- B. Branched cells
- C. Have no striations
- D. Have intercalated disc
Explanation: Cardiac muscle is striated, like skeletal muscle, as the actin and myosin are arranged in sarcomeres, just as in skeletal muscle.
Correct answer: Have no striations- A. Interstitial fluid
- B. Cytoplasm
- C. Water
- D. Lymph
Explanation: The tissue fluid or 'interstitial fluid' is the medium of exchanging materials including gases, glucose, etc between blood and cells.
Correct answer: Interstitial fluid- A. Made up of unstriated and branched cells
- B. Voluntary in action
- C. Self excitatory or myogenic
- D. Striated and unbranched
Explanation: Unlike skeletal muscle, which contracts in response to nerve stimulation, and like single-unit smooth muscle, cardiac muscle is myogenic…
Correct answer: Self excitatory or myogenic397. Guard cells help in
- A. transpiration
- B. guttation
- C. fighting against infection
- D. protection against grazing
Explanation: (a) : Stomata are the main organs for transpiration. The stem and leaf epidermis are provided with numerous stomata.
Correct answer: transpiration- A. Cytoplasmic streaming
- B. Root pressure and transpiration pull
- C. P-proteins
- D. Mass flow involving a carrier and ATP
Explanation: According to the mass flow hypothesis, the transport of organic solutes takes place from source to sink, this transport also depends on…
Correct answer: Mass flow involving a carrier and ATP- A. Hormonal change in guard cells
- B. Change in turgor pressure of guard cells
- C. Gaseous exchange
- D. Respiration
Explanation: It is turgor pressure in guard cells which determines the opening and closing of stomata.
Correct answer: Change in turgor pressure of guard cells- A. Circulatory fluid
- B. Tissue fluid
- C. Lymph
- D. Lymph or tissue fluid
Explanation: Lymph capillaries end blindly in the body tissue, where pressure from the accumulation of interstitial fluid forces the fluid to enter the…
Correct answer: Lymph or tissue fluid