Reproduction Flashcards
Where does spermatogenesis occur in testis
Seminiferous tubule
Characteristics of identical twins
They are similar in terms of sex, blood group and physical characteristics
Explain the process of spermatogenesis
The process begins along with the primordial germ cells that are located on the walls of the seminiferous tubule.
The primordial germ cells divide to form many diploid spermatogonia.
The spermatogonia will grow to form a primary spermatocyte.
The spermatocyte undergoes meiotic division to produce secondary haploid spermatocytes.
The secondary haploid spermatocytes undergo meiotic division to form four spermatids
How LH provides a negative feedback effect on the menstrual cycle
The increasing level of LH stimulates the secretion of progesterone. Increasing of progesterone inhibit secretion of LH and FSH. There is no development of new follicle.
Health problems experienced by a menopaused woman
Formation of follicle and ovulation stops. Production of oestrogen and progesterone decreases.
A decrease in ovulation can cause a woman to feel warm, often sweating at night, restlessness and depression.
Loss of calcium from the bone osteoporosis
What will happen to ovum if not fertilised
It will disintegrate and be eliminated with the blood as menstruation
Difference between spermatogenesis and oogenesis
Spermatogenesis:
All spermatids produced in meiosis II will form sperms, whereas in oogenesis, only one of the four secondary oocytes produced in meiosis II will form an ovum.
The rest will form polar bodies and eventually disintegrate
Effects of testosterone during puberty
Deepening of voice, growth of hair in the pubic region, armpit, chest and face
What will happen to corpus luteum if fertilisation fail to occur
It will break down and stop producing progesterone
Pathway took by secondary oocyte after ovulation
The secondary oocyte is released from the ovary and go into the fallopian tube. It will travel down the fallopian tube towards the uterus. If there is no fertilisation, the secondary oocyte is discharged
Explain changes and relationship between the level of progesterone and the thickness of the endometrium
(pg 8)
From the 22nd day of the second month, the level of progesterone increases after fertilisation and implantation have occurred.
High level of progesterone stimulates the endometrium to become more folded and highly vascularised to support the growing foetus.
From the second to the third month, the level of progesterone continues to rise.
Progesterone continues to stimulate the endometrium to further develop and support to the growing embryo.
