A) tricuspid valve
B) bicuspid valve
C) semilunar valve
D) eustachian tube
Correct Answer: A
Solution :
Tricuspid valve consists of three flaps, situated between the right atrium and the right ventricle of the mammalian heart. Bicuspid valve consists of two flaps, situated between the left atrium and the left ventricle of the birds and mammalian heart. Semilunar valve in the heart are found in the pulmonary artery and in aorta, that prevents the backflow of blood into the right and left ventricles from the pulmonary artery and the aorta, respectively, thus maintaining blood flow in a single direction. Eustachian tube connects the middle ear to the back of throat (pharynx) in vertebrates.
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