Fill in the blanks:
Vitamin A, also known as __________, is a __________ vitamin. Its deficiency can lead to __________.
A. ascorbic acid, water-soluble, night blindness
B. calciferol, fat-soluble, osteoporosis
C. retinol, water-soluble, osteoporosis
D. retinol, fat-soluble, night blindness
Which layer of the skin contains hair follicles, sweat glands, and nerves?
A. the dermis
B. the subcutaneous layer
C. the basal layer
D. the epidermis
Which element is essential for the normal production of the hormone thyroxine?
A. phosphorus
B. iodine
C. calcium and vitamin D
D. magnesium
Which of these is known as the pacemaker of the heart?
A. AV node
B. cardiac plexus (nerve fibers)
C. SA node
D. muscle fibers of the atria
Which valve is found between the left atrium and the left ventricle?
A. the tricuspid valve
B. the pulmonary valve
C. the aortic valve
D. the mitral valve
Which of these is not a part of the central nervous system?
A. spinal cord
B. tract (bundle of nerve fibers/axons)
C. brain
D. cranial nerves
Which structure is not considered a part of the rib cage?
A. the thoracic vertebrae
B. costal cartilage
C. sternum
D. the lumbar vertebrae
Large lymphatic trunks unite to form which two main vessels of the lymphatic system?
A. thoracic duct and superior vena cava
B. right lymphatic duct and thoracic duct
C. left lymphatic duct and thoracic duct
D. right lymphatic duct and left subclavian vein
Which of these is not a lymphoid organ?
A. thymus
B. tonsils
C. liver
D. spleen
On each side of the body, the brachiocephalic veins are formed by the union of which two veins?
A. external jugular veins and subclavian veins
B. external jugular and internal jugular veins
C. common carotid and subclavian veins
D. internal jugular veins and subclavian veins
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