Testes
Sperms form in the testes.
A cooler place
The testes lie in a bag of skin outside the body cavity, not inside it.
Why do you think they are placed outside the abdominal cavity?
What this lesson covers
The idea
Sperms form in the testes, which lie outside the abdominal cavity in the scrotum because sperm formation needs a temperature lower than body temperature; testosterone from the testes regulates sperm formation and brings puberty changes in boys.
A cooler place
The testes lie in a bag of skin outside the body cavity, not inside it.
Why do you think they are placed outside the abdominal cavity?
- Sperm formation needs a lower temperature than body temperature
- They are too big to fit inside
- To keep them warm
The male system, a diagram
Open each tab. This is a schematic diagram.
Testes and testosterone
The testes make sperms. They hang in the scrotum, outside the abdominal cavity, because sperms form best at a temperature lower than the body temperature. The testes also secrete testosterone, which regulates sperm formation and brings the changes of puberty in boys.
Sperms form in the testes, which lie outside the abdominal cavity in the scrotum because sperm formation needs a temperature lower than body temperature. Testosterone from the testes regulates sperm formation and brings puberty changes in boys.
Notes
Sperms form in the testes in the scrotum, outside the abdominal cavity, because they need a lower temperature. Testosterone regulates sperm formation and brings puberty changes in boys.
Check yourself
Where are sperms formed?
Why are the testes located outside the abdominal cavity?
What does the hormone testosterone do?
- In the scrotum's skin only. Sperms are formed in the testes, which are located in the scrotum.
- In the testes — correct. Yes!
- In the urethra. The urethra is a common passage for sperms and urine. Sperms are formed in the testes.
- They are too large to fit inside. The book's reason is the lower temperature needed for sperm formation.
- Sperm formation needs a higher temperature than the body has. The book says sperm formation requires a lower temperature than the normal body temperature.
- Sperm formation requires a lower temperature than the normal body temperature — correct. Yes!
- Regulates sperm formation and brings changes in appearance at puberty in boys — correct. Yes!
- Carries sperms to the urethra. The vas deferens delivers the sperms. Testosterone regulates sperm formation and brings puberty changes.
- Makes the testes smaller. The book says testosterone regulates the formation of sperms and brings about changes in appearance at puberty.