Are the testicles hard?

The male reproductive organs and female reproductive organs are two completely different systems, but they complement each other. Without either set of male or female reproductive organs, the purpose of reproduction cannot be achieved. The testicles are the most important part of the male reproductive organs. They are the organs that produce sperm. For men, it is related to the core issue of fertility. Are testicles hard? Let's take a look at the explanation below. I hope everyone can understand it.

Testicles are male internal reproductive organs. Normal men have two testicles, one on the left and one on the right side of the scrotum. Testicles are oval in shape and grayish white in color. Adult testicles are 3.5-4.5 cm long, 2-3 cm wide, and 1-2 cm thick. Each testicle weighs 10-15 grams. Generally, the left testicle is about 1 cm lower than the right testicle. Some people have one testicle that is larger than the other, or one that is higher than the other. If the difference is not too big, it is normal. There are a large number of curved seminiferous tubules in the testicles, which contain interstitial cells. The seminiferous tubules are where sperms are produced. The number of sperms produced in a person's lifetime is astonishing. A single ejaculation of 3-4 ml contains 300-400 million sperms, and as few as 100-200 million. The number of sperms produced in a lifetime can reach more than 1 trillion. Sperm production is easily affected by many factors such as temperature. If the temperature around the testicles is too high or affected by chemical toxins, sperm production will be impaired. Interstitial cells produce androgens, which are closely related to male secondary sexual characteristics and physiological functions.