QUES TION T7 The large artery in the thigh is the O A radial artery O B. tibial

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QUES TION T7 The large artery in the thigh is the O A radial artery O B. tibial artery O C. femoral artery O D brachial artery QUESTION 18 The purkinje fibers can self-excite. O A false o B. true QUESTION 19 Red blood cells contain a very large nucleus A false B true QUESTION 20 The P wave on the ECG represents O A atrial depolarization. O B. ventricular depolarization. O C the SA node firing O D.ventricular repolarization QUESTION 21 What membranous sac surrounds the heart? O A pleura B. myocardium O C mediastinum QUESTION 22 These cells kill parasites and help control inflammation and allergic reactions B. monocytes C eosinophils Click Save and Submit to save and submit. Click Save All Answers to save all ansuers

Explanation / Answer

17. The large artery in the thigh is the femoral artery. It is the second largest artery after the aorta. It supplies blood to the lower limb. It branches into smaller arteries as blood circulation continues to the toes. It lies behind the inguinal ligament in the femoral triangle at the head of the femur bone.

Option C.

18. Purkinje fibers are unique tissues present in the ventricular walls of the heart. These fibers are self-conducting fibers larger than cardiomyocytes, thereby creating faster action potentials. They can spontaneously depolarize and self-excite due to altered membrane permeability to sodium ions. Depolarization occurs faster creating action potential as they reach the threshold level very fast.

Option B.

19. Red blood cells are enucleated cells. Hence, they lack a nucleus and cannot divide. Their nucleus is lost during the enucleation step in their synthesis. This adaptation allows efficient transport of oxygen via haemoglobin.

Option A.

20. The P wave represents depolarization of the left and right atrial muscle fibers. The Right atrium is depolarized ahead of the left atrium causing atrial contraction. It originates as a small upward wave and is the first deflection.

Option A.

21. The fluid filled membranous sac that covers the heart is the pericardium. It functions to keep the heart within the chest cavity, limits the motions of the heart, and prevents over-expansion of heart during increased blood flow.

Option D.

22. Neutrophils are the cells that are recruited early during infection with bacterial and viral parasites. These WBCs engulf pathogens and are recruited first to site of injury. There is increased trafficking from the bone marrow to the tissues during chronic allergic reactions such as asthma. Neutrophil activation leads to inflammation during allergic reaction that causes tissue damage. Eosinophils, although playing a role in allergies, have anti- inflammatory properties. Monocytes, on the other hand, have to be converted to macrophages that phagocytose bacteria and other pathogens. These monocytes are inflammatory and play a role in allergic reaction.

Option D.

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