Structure of Human Sperm

In humans, there are two types of gametes been produced: in females, non-motile egg and in males, motile sperm. 

Millions of sperms race against each other to fertilize the egg. Out of millions of sperms, one sperm wins and succeeds in fertilizing the egg. When the nucleus of a human sperm fuses with egg, the process is termed as fertilization.

In this article, we will study the structure of Human Sperm in details and know about the functions each part of Human Sperm.  We will also answer interesting facts related to Human Sperm and fertilization process such as:

• What is so unique about every sperm which makes it faster than the other sperms? 
• Once a sperm fertilizes an egg, how does it prevent other sperms from entering the egg? How is polyspermy prevented?
• How is sex of a child determined?
• Is it correct to blame women for giving birth to only girl child?

ICSE 2018: Given below are diagrams showing the different stages in the process of fertilization of an egg in the human female reproductive tract.

ICSE 2018 

Q. Given below are diagrams showing the different stages in the process of fertilization of an egg in the human female reproductive tract. [5 marks] 

Study the diagrams and answer the questions: 

(i) Arrange the letters given below each diagram in logical sequences to show the correct order in the process of fertilization. 

(ii) Where does fertilization normally take place? What is ‘Implantation’ that follows fertilisation 

(iii) Mention the chromosome number of the egg and zygote in humans. 

(iv) Explain the term ‘Gestation’. How long does Gestation last in humans? 

(v) Draw neat, labelled diagram of a mature human sperm.

Solution: