Which one of the following statements about human sperm is correct?
1. | The acrosome has a conical, pointed structure used for piercing and penetrating the egg, resulting in fertilization. |
2. | The sperm lysins in the acrosome dissolve the egg envelope, facilitating fertilization. |
3. | The acrosome serves as a sensory structure, leading the sperm towards the ovum. |
4. | The acrosome serves no particular function. |
Seminal plasma in humans is rich in:
1. | fructose, calcium and certain enzymes |
2. | fructose and calcium but has no enzymes |
3. | glucose and certain enzymes but has no calcium |
4. | fructose and certain enzymes but poor in calcium |
The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis is:
1. | spermatocyte-spermatogonia- spermatid-sperms |
2. | spermatogonia-spermatocyte-spermatid-sperms |
3. | spermatid-spermatocyte-spermatogonia-sperms |
4. | spermatogonia-spermatid-spermatocyte-sperms |
1. primary spermatocytes
2. secondary spermatocytes
3. spermatids
4. spermatogonia