Transcript Figure 44.13 Nitrogenous wastes

Objective: You will be able to identify and give
the function of the human excretory organs.
Do Now:
• Read 27:10 on p. 575 only
• Describe nephrons
Figure 44.6 Skin as an organ of thermoregulation
Excretory organs
• Skin- rids the body of excess water, salt and
urine
– Primarily used for regulating body temperature
• Lungs- Rid the body of excess water and
CO2
• Liver- Makes urea by breaking down amino
acids (deamination)
• Kidney- filters the blood to remove wastes
Kidney
• Removes excess water, salts and urea from
the body
• Made up of microscopic structures called
nephrons
– It is the nephrons of the kidney that actually
filters the blood of the wastes
Urinary System
Figure 44.13 Nitrogenous wastes
Figure 44.21 The human excretory system at four size scales
Figure 44.22 The nephron and collecting duct: regional functions of the transport
epithelium