Grade 7 students explore the urinary system in this Life Science lesson from Chapter 18, learning how the kidneys filter chemical waste from the blood through structures called nephrons and the glomerulus. The lesson covers how urine is formed and travels through the ureters, bladder, and urethra to exit the body, and how this process supports homeostasis. Students also compare waste removal across multiple body systems, including the respiratory system, digestive system, and skin.
Section 1
Kidneys Filter Waste from Blood
The kidneys contain nephrons that filter all your blood several times daily, removing wastes while returning important nutrients to the bloodstream. This filtered waste becomes urine that exits through ureters and bladder.
Section 2
Body Systems Remove Different Wastes
Four body systems eliminate different waste types: the urinary system filters liquid waste from blood, respiratory system removes gases, digestive system eliminates solid food waste, and skin excretes waste through sweat.
Section 3
Kidneys Maintain Water Balance
Beyond filtering waste, kidneys regulate water levels in your body to maintain homeostasis. They adjust the amount of water in urine depending on your body's needs, preventing swelling or dehydration.
Section 4
Waste Travels Through the Urinary System
After kidneys filter wastes, the resulting liquid travels through ureters to the bladder for storage. When ready, voluntary muscles relax, allowing the bladder to contract and send urine through the urethra.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter
Expand to review the lesson summary and core properties.
Section 1
Kidneys Filter Waste from Blood
The kidneys contain nephrons that filter all your blood several times daily, removing wastes while returning important nutrients to the bloodstream. This filtered waste becomes urine that exits through ureters and bladder.
Section 2
Body Systems Remove Different Wastes
Four body systems eliminate different waste types: the urinary system filters liquid waste from blood, respiratory system removes gases, digestive system eliminates solid food waste, and skin excretes waste through sweat.
Section 3
Kidneys Maintain Water Balance
Beyond filtering waste, kidneys regulate water levels in your body to maintain homeostasis. They adjust the amount of water in urine depending on your body's needs, preventing swelling or dehydration.
Section 4
Waste Travels Through the Urinary System
After kidneys filter wastes, the resulting liquid travels through ureters to the bladder for storage. When ready, voluntary muscles relax, allowing the bladder to contract and send urine through the urethra.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter