Advertisements
Advertisements
प्रश्न
Give scientific reasons: Mature erythrocytes in humans lack nucleus and mitochondria
Advertisements
उत्तर
In case of fertilisation of the ovum by a sperm, the corpus luteum persists and continues to secrete progesterone in the body thus maintaining its high levels. The presence of progesterone prevents the maturation of another ovum, thus temporally stopping the menstrual cycle.
APPEARS IN
संबंधित प्रश्न
Explain the process of development in human beings.
How many pairs of chromosomes are present in human beings? Out of these how many are sex chromosomes?
Which part of the human body produces ova?
Which part of the human body passes sperms from a man to a woman?
For how much time does menstruation last in human females (or women)?
What is the life support system of a fetus?
What is ovulation? How often does it happen in human females?
The ratio of the number of chromosomes in a human zygote and a human sperm is ______
Draw a diagram of human female reproductive system and label the part.
(i) That produces eggs.
(ii) Where fusion of egg and sperm take place.
(iii) Where zygote is implanted.
What happens to human egg when it is not fertilized?
