chordae tendineae string like processes in the heart that attach the edges of the bicuspid and tricuspid valves to the walls of the ventricles, preventing them from being forced back into the atria when the ventricles contract. Answer : (b)

Systole, period of contraction of the ventricles of the heart that occurs between the first and second heart sounds of the cardiac cycle (the sequence of events in a single heart beat). Systole causes the ejection of blood into the aorta and pulmonary trunk or exit of blood from ventricles Answer : (d)

In humans, the heart is located between the lungs, in the middle compartment of the chest. But Ventricles are left side. The heartbeat (pulse) that we feel is caused y the contraction of the ventricles. Answer : (c)

Glycosuria or glucosuria: is the excretion of glucose into the urine. X-linked disorder: disease or disorder associated with genetic abnormalities on the X chromosomes. Examples are the muscular dystrophies and hemophilias. Answer : (a)

The lymph contains plasma and lesser number of WBCs and platelets. Answer : (c)

Basophils: contain anticoagulant heparin, which prevents blood from clotting too quickly. They also contain the vasodilator histamine, which promotes blood flow to tissues Answer : (c)

In many lower vertebrates lymphocytes are produced in liver. Answer : (a)

A mast cell is a type of white blood cell, contains many granules rich in histamine and heparin. Answer : (a)

Cockroaches do not have red blood because they do not use hemoglobin to carry oxygen. They do not carry oxygen in their blood stream either. Answer : (b)

Purkinje fibres arise from middle of ventricles Answer : (b)

Enterohepatic circulation refers to the circulation of biliary acids, bilirubin, drugs, or other substances from the liver to the bile, followed by entry into the small intestine Cholecystokinin: a hormone which is secreted by cells in the duodenum and stimulates the release of bile into the intestine and the secretion of enzymes by the pancreas Answer : (d)

Essential for the maturation of red blood cells are Vitamin B12 (cobalamin) and Vitamin B9 (Folic acid). vitamin c Answer : (a)

The brain receives oxygenated blood from two sources: the internal carotid arteries, and the vertebral arteries Answer : (b)

The duration of the cardiac cycle is the reciprocal of heart rate. Assuming a heart rate of 75 beats per minute, each cycle takes 0.8 seconds. Answer : (b)

When one of the inherited alleles is A and the other is B, the genotype is heterozygous and the blood type is AB. Answer : (c)

Hematopoiesis is a synonym of haemopoiesis. but they are different the difference between hematopoiesis and haemopoiesis is that hematopoiesis is the process by which blood cells are produced; hematogenesis while haemopoiesis is formation of new cellular components of the blood in myeloid or lymphatic tissue. Answer : (c)

Absolute refractory period corresponds to depolarization and repolarization Absolute refractory period : is a period during which the cardiac muscle will not respond to any stimulus Answer : (a)

Endothelium is a type of epithelium that lines the interior surface of blood vessels and lymphatic vessels, forming an interface between circulating blood or lymph in the lumen and the rest of the vessel wall. Answer : (c)

Blood platelets produce Thromboplastin Answer : (b)

Sinoatrial (SA) node is natural pacemaker, located at the top of the heart's upper-right chamber (the right atrium). Answer : (a)

Answer : (c)

Amphibian RBCs are the largest among vertebrates. Smallest RBCs about 1.5 µm diameter in Musk deer. Answer : (c)

Renal artery have largest amount of urea, but not given in option Hepatic veins are blood vessels which transport the liver'sdeoxygenated blood and blood which has been filtered by the liver to right atrium Hepatic portal vein carries blood and nutrients from the stomach, spleen, intestines and gall bladder to the liver The dorsal aorta are paired (left and right) embryological vessels which progress to form the descending aorta Answer : (b)

Recipient group have Antibodies Anti A and Anti B thus , GroupA, Group B or Group AB cannot donate blood to Group O Recipient A have antibodies AntiB thus Group B can not donate Now Group AB have no antibodies thus Group A, Group B and Group O can donate Answer : (d)

Squeezing of Leucocytes out from the capillary walls to fight foreign agents is known as Diapedesis Answer : (a)

The sympathetic nervous system (SNS) releases the hormones (catecholamines - epinephrine and norepinephrine) to accelerate the heart rate. The parasympathetic nervous system (PNS) releases the hormone acetylcholine to slow the heart rate. Answer : (b)

Blood pressure in the mammalian aorta is maximum during systole of the left ventricle because the heart shrinks and pushes loads of blood into aorta Answer:(d)

Answer:(a)

Erythropoiesis is the process which produces red blood cells this usually occurs within the red bone marrow. Answer:(a)

Second sound Lubb S2, is caused by the closure of aortic and pulmonic valves (semilunar valve), marking the end of systole. Or Heart pumps blood from the chambers into the arteries. Answer:(d)