Eustachian canal connects
middle ear with external ear
middle ear with internal ear
external ear with internal ear
pharynx with middle ear
A.
middle ear with external ear
The eustachian tube is a canal that connects the middle ear to the nasopharynx, which consists of the upper throat and the back of the nasal cavity. The function of eustachian tube is to equalize air pressure on both sides (external and middle ear) of tympanic membrane. Thus, it connects middle ear with external ear.
A man of 'A' blood group marries a woman of 'AB' blood group, which type of progeny would indicate that man is heterozygous ?
O
B
A
AB
