Step 1: The human male reproductive system diagram typically includes key structures. Assuming a standard labeled diagram:
- A (Testis): Paired organs in the scrotum, responsible for sperm production and testosterone secretion.
- B (Vas deferens): Tube transporting sperm from the epididymis to the urethra.
- C (Prostate gland): Gland below the bladder, secreting seminal fluid to nourish sperm.
- D (Penis): External organ for sperm delivery and urination.
Step 2: Without the specific diagram, these are standard labels for a male reproductive system. If the diagram is female, please specify for adjustments (e.g., A: Ovary, B: Fallopian tube, etc.).