Grade 11 Biology-Excretory System Unit Study Guide With 100% Accurate Answers.

Basic function of the excretory system - Answer Regulate the volume and composition of body fluids by removing waste and returning substances in the body for reuse What does the excretory system do? - Answer Regulates levels of Na and K, maintaining water balance, maintaining blood Ph of 7.4, and eliminating urea Waste Products - Answer Is in excess in the body, may include carbon dioxide, water, ions (Na, Cl, H), compounds formed from the breakdown of ammonia urea How many kidneys do humans have? - Answer Two fist sized kidneys How does urine travel from the kidneys? - Answer Urine is released into two long tubes called ureters that move it by peristaltic contractions into the urinary bladder for storage and then later leaves the body by the urethra when the two sphincters relax Outer layer of kidney - Answer Renal Cortex (body of nephrons) Inner layer of kidney - Answer Renal medulla (collecting tube of nephrons) Funnel like structure that narrows into ureters - Answer Renal pelvis Blood enters the kidney through - Answer Renal Artery Blood leaves kidney through - Answer Renal vein How many nephrons are in each kidney? - Answer One million