## Lakshya Education MCQs

Question: Stroke volume is the amount of blood the left ventricle pumps out in one cardiac cycle. This is around 70ml. Now, to get the cardiac output, we have to multiply (i)__ with the normal heart rate of (ii)__ /min and we get (iii)__ ml/min. This means that in one minute, each ventricle of a normal heart pumps about (iv)__ litres of blood out.
Options:
 A. (i) Stroke volume, (ii) 72, (iii) 5,040, (iv) 5 B. (i) Total volume, (ii) 82, (iii)8,200, (iv) 8 C. (i) Volume of the heart, (ii) 72,(iii)3,720, (iv) 3 D. (i) Volume of the ventricles,(ii) 72, (iii)2,600,(iv) 2
: A

Stroke volume is the amount of blood the left ventricle pumps out in one cardiac cycle. This is around 70 ml. Cardiac output is the volume of blood pumped out by each ventricle per minute. Now to get cardiac output,we have to multiply stroke volume with the normal heart rate of 72 beats/min and we get 5,040 ml/min. This means that in one minute, each ventricle of a normal heart pumps about 5 litres of blood.

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## More Questions on This Topic :

Question 1. Which of the plasma proteins listed below is not matched correctly to its function?
1.    Albumin - maintains osmotic pressure in blood
2.    Globulins - Enzymes and carrier proteins
3.    Fibrinogen- transport minerals, lipids, hormones and vitamins.
4.    Immunoglobulin- attacks and destroys pathogens.
: C

Globulins have some enzymes, carrier proteins. Immunoglobulins are involved in attack and destruction of pathogens. Fibrinogen is the blood clotting agent. Albumin maintains osmotic pressure in blood cells, transports molecules and also eliminates free radicals.
Question 2. The lymphatic system consists of ______.
1.    Lymphatic vessels and lymphoid organs
2.    All of the plasma components of the bloodstream
3.    All fluids inside the body's cells
4.    All liquids in the body whether inside the cells or in spaces between the tissues.
: A

The Lymphatic system is made of three main components - the lymphatic vessels, lymph, andthe lymph nodes. The lymphatic system has multiple interrelated functions. It is responsible for the removal of interstitial fluid from tissues. It absorbs and transports fatty acids and fats as chylefrom the digestive system. It transports white blood cells to and from the lymph nodes into the blood.
Question 3. Which of these statements is NOT true about the heart?
1.    The heart is situated between the two lungs in the mediastinum.
2.    The heart is a pear shaped hollow organ.
3.    The apex of the heart always rests on the diaphragm.
4.    The heart develops from the ectoderm.
: D

The 3 germ layers - the ectoderm, the mesoderm, and the endoderm (endoderm) are in place at the end of gastrulation. The Ectoderm gives rise to the central nervous system (the brain and spinal cord) etc. The Mesoderm gives rise to connective tissue, cartilage, and bone; striated and smooth muscles and the heart walls etc. The Endoderm gives rise to the tonsils, the thyroid gland, parathyroid glands, and thymus gland; the larynx, trachea, and lungs; the gastrointestinal tract, the urinary bladder etc.
Question 4. Thromboplastin required for blood clotting at the place of injury is released by _____.
1.    thrombocytes
2.    monocytes
3.    basophils
4.    neutrophils
: A

Thrombocytes - irregularly shaped, disk like cytoplasmic fragment of a megakaryocyte that is shed in the marrow sinus and subsequently found in the peripheral blood, where it functions in clotting at the place of injury. A platelet contains granules in its central part (granulomere) and, peripherally, clear protoplasm (hyalomere), but no nucleus, is about one third to one half the size of an erythrocyte, and contains no hemoglobin.
Question 5. Which of the following is true about the circulatory system of animals?
1.    Only vertebrates, annelids and cephalopods, have closed circulatory system.
2.    All vertebrates have separate pulmonary and systemic circulations.
3.    The circulatory system of Mammals and Birds are similar to Amphibians.
4.    Animals can have only one heart or else the circulatory system would not work.
: A

All vertebrates, annelids like earthworms and cephalopods like octopi, have a closed circulatory system, with the complete separation of both systemic and pulmonary circuits. The rest of the animal world has an open circulatory system. Birds, like mammals, have a 4-chambered heart. Amphibians and reptiles have 3 chambers in their hearts.
Question 6. Which of the following sequences is the correct pathway for systemic circulation?
1.    Right ventricle → pulmonary aorta → tissues → pulmonary veins → left auricle
2.    Left auricle → left ventricle → aorta → arteries → tissues → veins → right atrium
3.    Left auricle → left ventricle → pulmonary aorta → tissues → right auricle
4.    Right auricle → left ventricle → aorta → tissues → veins → right auricle