Topic 4 Excretory System: Excretion in Humans

Question 1

• CO2 and H2O (gas) diffuse from the blood and are continually exhaled

Answer 1

1. Lungs

Question 2

• Largest internal organ that processes nitrogenous wastes, blood pigment wastes, other chemicals, produced urea via the urea cycle

Answer 2

2. Liver

Question 3

• Sweat glands in skin excrete water and dissolved salts to regulate body temp
• Largest organ
• Sweat land function decreases as we age

Answer 3

3. Skin

Question 4

• 3 regions:
  a. Outer cortex
  b. Inner medulla
  c. Renal pelvis which drains to ureter
• Each has many nephrons, the functional unit of kidney
• Kidney functions to:
  a. Excrete waste via path: ureter -> bladder 0> urethra
  b. Maintain homeostasis of body fluid volume and solute composition
  c. Regulate blood pressure

Answer 4

4. Kidney