18. Spinal umbar elexiting the cord from the tevet of l4 to shout S4 term A. C.
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18. Spinal umbar elexiting the cord from the tevet of l4 to shout S4 term A. C. Sacral plexus D. Pelvic plexus E. Brachial plexus 19. Urine is carried from the kidney A. Urethra B. Ureter C. Calyces D. Renal columns E. Renal tubules to the urinary bladder by the 20. All cardiac veins empty into the which then empties into the A. Coronary; sinus B. Coronary sinus; right atrium C. Great cardiac vein; right atrium D. Great cardiac vein; superior vena cava E. Inferior vena cava; left atrium 21. The chordae tendineae A. Connect the atria to the ventircles B. Are found in the interventricular septum C. Are part of the conducting system of the heart D. Connect the flaps of the AV valves to the papillary muscles E. Are a part of the myocardium 22. Lymph nodes are surrounded by a dense connective called A. Cortex B. Capsule C. Reticulum D. Trabeculum E. Basement membrane 23. The diameter of bronchioles can change because their walls contain A. Smooth muscle B. Skeletal muscle C. Fibrous cartilage D. Hyaline cartilage E. Elastic cartilage 24. Which of the following is part of the upper respiratory tract? A. Larynx B. Pharynx C. Trachea D. Bronchi E. BronchiolesExplanation / Answer
18. c. Sacral plexus [ nerve exiting from l4 to s4 are known as sacral plexus]
19.b. Ureter. [ from the kidney to the bladder is carried by ureter, from the bladder to environment by urethra ]
20.b. coronary sinus, right atrium
21. d. connect the flaps of the AV valves to the papillary muscle
22. b. capsule [ capsule is a connective tissue structure in lymph node ]
23.a. smooth muscle [ smooth muscle can contract and dilate, why smooth muscle, lung have smooth muscle, not skeletal muscle as this is under autonomic control ]
24. b pharynx [ though some books consider larynx to be a part of the upper respiratory tract, most of the standard textbook consider pharynx as the last part of the upper respiratory tract, which can be seen by eye without any equipment]
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