The smaller the zone of growth inhibition in Kirby-Bauer test (disc-diffusion), the more effective the tested antibiotic against that particular tested bacterium.

BONUS:  A single primary spermatocyte will give rise to how many sperm?

Identify this portion of the penis:

Interstitial cells, found between the seminiferous tubules of the testes, produce testosterone.

This muscle is found on the spermatic cord and can raise the testes:

Which cells of the testes produce testosterone?

The testes are located in the _____________________ to maintain a temperature approximately 3 degrees cooler than body temperature.

Which of the following is NOT an accessory gland of the male reproductive tract:

This duct transports sperm from the testes into the male pelvis:

 Identify this structure: