QuestionSBA
QuestionChoice
Cortical granules prevent polyspermy during fertilisation. Cortical granules are secretory vesicles poised at the cortex of an egg that, upon stimulation by sperm contact at fertilization, secrete their contents. These contents modify the extracellular environment and block additional sperm from reaching the egg.
10001716
e
Cortical granule
QuestionChoice
The Zona pellucida is a thick extracellular matrix that surrounds the oocyte and pre-implantation embryo. The acrosome reaction occurs after sperm capacitation/ calcium ion influx causes the exocytotic event where the spermatozoa can then penetrate the zona pellucida and fuse with the egg plasma membrane.
10001712
a
Zona pellucida
QuestionChoice
The perivitelline space is the space between the zona pellucida and the cell membrane of an oocyte or fertilized ovum. In the slow block to polyspermy, the cortical granules released from the ovum are deposited in the perivitelline space.
10001715
d
Perivitalline space
QuestionChoice
Granulosa cells are a population of somatic cells whose role after ovulation is progesterone production.
10001713
b
Granulosa cells
QuestionChoice
The corona radiata surrounds the egg and consists of up to three layers of cells from the follicle. They are attached to the zona pellucida and their main purpose is to supply vital proteins to the cell.
10001714
c
Corona radiata
Concept
Chapter
2693
3963
Mechanisms of Fertilisation
Topic
175
Reproductive Physiology
12889
For fertilisation to occur, what is the name of the layer of the egg that the sperm must penetrate?
a