Heart & Excretory System: Understanding Their Roles

The heart is not part of the excretory system. It belongs to the circulatory system, pumping blood to deliver oxygen, nutrients, and hormones, and to transport metabolic wastes (CO₂, urea) to excretory organs.

The excretory system eliminates waste and maintains homeostasis. Major components:

• Kidneys: Filter blood, produce urine (nitrogenous wastes, electrolytes, water).
• Liver: Detoxifies, produces urea (from ammonia), excretes bilirubin via bile.
• Lungs: Excrete CO₂ and volatile substances.
• Skin (Sweat Glands): Excrete water, electrolytes, urea.
• Large Intestine: Eliminates fecal waste (bacteria, undigested fiber, bile pigments).

The heart and excretory organs work in concert: cardiac output determines renal perfusion and filtration; the kidneys regulate blood volume and pressure, affecting cardiac load.