QS Study

Testosterone is the key sex hormone found in men. It regulates male fertility, muscle mass, red blood cell production and overall physical features. It is most often linked with sex drive and plays an essential function in sperm production. Women have testosterone too but in much lesser amounts than in men.

Functions of testosterone:

(A) During fetal development:

  1. Responsible for sex determination and development of both external and internal genitalia in the male fetus.
  2. Helps in the descent of testes.

(B) On adult primary and secondary sexual characteristics:

  1. Causes the penis, scrotum, and testes to enlarge 7 fold before the age of 20 years.
  2. Causes growth of hair over the pubis, along with the linea alba, on the face and usually on the chest.
  3. Causes enlargement of the larynx and length and thickness of vocal cords and voice becomes deeper.
  4. Increases the thickness of skin and rale of the rate of sebaceous gland secretion.
  5. Helps in increasing musculature due to protein anabolic functions.
  6. Increases the total quantity of bone matrix and calcium retention.
  7. Causes the epiphysis of the long bone to unite with the shafts.
  8. Increases basal metabolic rate and RBC count.
  9. Along with FSH, maintains spermatogenesis.
  10. Exerts an inhibitory feedback effect on LH secretion.
  11. Enhances and maintains the motility fertilizing powers of sperm.

(C) Others:

  1. Causes moderate Na+, K+, H2O, Ca++, SO42- and PO43- retention.
  2. Also increases the size of the kidneys.

Common Function of Testosterone in men – As a man, there are fewer hormones more important than testosterone in your body.

Testosterone has a constructive effect on many aspects of your health, including:

  • Losing fat, gaining muscle, and improving body composition
  • Increasing libido, erection eminence, sexual contentment, etc.
  • Helping fight off definite diseases such as Alzheimer’s and heart disease
  • Improving cognitive function and temper.
  • Strengthening bones.