Fertilisation in humans is practically feasible only if?
the ovum and sperms are transported simultaneously to the ampullary-isthmic junction of the fallopian tube
the ovum and sperms are transported simultaneously to the ampullary-isthmic junction of the cervix
the sperms are transported into the cervix within 48 hrs of the release of the ovum in the uterus
the sperms are transported into the vagina just after the release of the ovum in the fallopian tube
According to the text, fertilisation occurs in the fallopian tube (specifically the ampullary region) and can only occur if the ovum and sperms are transported simultaneously to this region. This necessity for simultaneous transport explains why not all copulations lead to fertilisation and pregnancy. Note: While newer texts specify the 'ampullary region', this question reflects the classic 'ampullary-isthmic junction' terminology often found in exams.
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