1. Answer : (c) Liver
Explanation: In the human embryo, the first site of blood formation is the yolk sac. Later in embryonic life, the liver becomes the most important red blood cell-forming organ, but it is soon succeeded by the bone marrow, which in adult life is the only source of both red blood cells and the granulocytes.
2. Answer : (d) Thromboplastin
Explanation: Thromboplastin (TPL) or thrombokinase is a mixture of both phospholipids and tissue factors found in plasma aiding blood coagulation through catalyzing the conversion of prothrombin to thrombin.
3. Answer : (b) 120 mm Hg and 80 mm Hg
Explanation: The systolic (or 'pumping') and diastolic (or 'filling') pressure in an adult with average health is 120 mm Hg and 80 mm Hg, respectively.
4. Answer : (c) 0.8 sec
Explanation: The cardiac cycle comprises a complete relaxation and contraction of both the atria and ventricles and lasts approximately 0.8 seconds.
5. Answer : (d) Squamous epithelium
Explanation: Cells lining our blood vessels belong to the squamous epithelial tissue. Squamous cells look like skinny, flat plates.
6. Answer : (c) congestion of lungs
Explanation: Heart failure occurs when the heart muscle doesn't pump blood as well as it should. Blood often backs up and causes fluid to build up in the lungs (congest) and in the legs.
7. Answer : (b) Below the collar bone
Explanation: A pacemaker insertion is the implantation of a small electronic device that is usually placed in the chest (just below the collarbone) to help regulate slow electrical problems with the heart.
8. Answer : (c) Anticoagulant
Explanation: Heparin is an anticoagulant (blood thinner) that prevents the formation of blood clots. Heparin is used to treat and prevent blood clots caused by certain medical conditions or medical procedures. It is also used before surgery to reduce the risk of blood clots.
9. Answer : (a) Haemophilia B
Explanation: Hemophilia B, also known as factor IX deficiency or Christmas disease, is the second most common type of hemophilia. The disorder was first reported in the medical literature in 1952 in a patient with the name of Stephen Christmas.
10. Answer : (a) sphygmomanometer
Explanation: Sphygmomanometer: An instrument for measuring blood pressure, particularly in arteries. The two types of sphygmomanometers are a mercury column and a gauge with a dial face.
11. Answer : (a) Atherosclerosis
Explanation: Atherosclerosis is a disease that occurs when plaque builds up inside arteries. The arteries get hard and narrow, which can restrict blood flow and lead to blood clots, heart attack, or stroke. Atherosclerosis may begin in childhood, and it gets worse over time.
12.Answer : (a) Pericardium
Explanation: The pericardium is the fibrous sac that surrounds the heart. It can be divided into three layers, the fibrous pericardium, the parietal pericardium, and the visceral pericardium. The parietal and visceral pericardia together form the serous pericardium.
13. Answer : (a) SA node
Explanation: The SA node is considered the pacemaker of the heart. Its electrical signals normally cause the atria of an adult's heart to contract at a rate of about 60 to 100 times a minute.
14. Answer : (b) P-depolarisation of the atria
Explanation: The P wave occurs when the sinus node, also known as the sinoatrial node, creates an action potential that depolarizes the atria. The P wave should be upright in lead II if the action potential is originating from the SA node. In this setting, the ECG is said to demonstrate a normal sinus rhythm or NSR.
15. Answer : (d) glycoproteins
Explanation: Antibodies are proteins (glycoproteins) called immunoglobulins. These are produced by the lymphocytes in response to the entry of a foreign substance or antigen into the body. Lipoproteins are the micellar complex of protein and lipids.
16. Answer : (d) muscle fibres found only in the ventricle wall
Explanation: 'Bundle of His' is a network of muscle fibers, found in the walls of ventricles. It transmits the electrical impulses from the AV node to the point of the apex via bundle branches.
17. Answer : (a) leukemia
Explanation: Cancer begins in blood-forming tissue, such as the bone marrow, or in the cells of the immune system. Examples of blood cancer are leukemia, lymphoma, and multiple myeloma. Also called hematologic cancer.
18. Answer : (a) semilunar valves
Explanation: During joint diastole rapid closure of semilunar valves at the beginning of ventricular diastole produces the second heart sound called 'dup'
19.Answer : (a) Factor IX
Explanation: The clotting factor IX is also known as Christmas factor. The name is derived from the boy, Stephen Christmas. He was lacking this factor and the deficiency led him to acquire hemophilia
20. Answer : (a) Phrenic
Explanation: The blood supply to the diaphragm is from the superior phrenic, musculophrenic, inferior phrenic, pericardiacophrenic, and lower internal intercostal arteries. The superior phrenic arteries arise from the thoracic aorta.
21. Answer : (c) Christian Bernard
Explanation: Fifty years ago, on 3 December 1967, the world's first human-to-human heart transplant was performed by Dr Christiaan Barnard at Groote Schuur Hospital in Cape Town.
22. Answer : (b) Lymph
Explanation: Lymph is known as the middle man of the body as 'Middle man' of circulation it mediates exchange. It transports oxygen, food materials, hormones, etc., to the body cells and brings carbon dioxide and other metabolic wastes, from the body cells to blood and then finally pours the same into the venous system.
23. Answer : (d) Medulla oblongata
Explanation: The cardiovascular center is a part of the human brain found in the medulla oblongata, responsible for the regulation of cardiac output.
24. Answer : (d) Cockroach
Explanation: The hemolymph or blood of cockroaches consists of colorless plasma. Hemolymph is without any respiratory pigment and hence does not help in respiration. The respiratory pigment is necessary because it carries oxygen to the blood and then circulates to the different parts of the body.
25. Answer : (c) Arteriole
Explanation: The aorta branches into arteries, which eventually branch into smaller arterioles. Arterioles carry blood and oxygen into the smallest blood vessels, the capillaries.
Click here to practice Body Fluids and Circulation MCQ Questions for Class 11