In biology, we are seeing a new topic: Excretion and Kidneys. We had to read a webpage containing information about the topic and also play with an animation (Male’s blog). Here are some revising questions about the topic.
1) a) Define the terms excretion and egestion
- Excretion as removal from organisms of the waste products of metabolism (chemical reactions in cells including respiration), toxic materials, and substances in excess of requirements.
- Egestion as the passing out of food that has not been digested or absorbed, as faeces, through the anus
1) b) The kidney is an excretory organ. It produces urine that contains urea. State where in the body urea is formed and what is formed from.
Urea is formed in the liver from excess amino acids.