Pineal Gland

Small brain gland producing melatonin to regulate sleep-wake cycles.

Key Functions:

• Secretes melatonin in response to light-dark cycles.
• Regulates circadian rhythms.
• Influences reproductive hormones.

Interacting Systems & Components:

• Suprachiasmatic Nucleus (light input)
• Melatonin (primary hormone)
• Nervous System (circadian regulation)