Part 1 Flashcards
1
Q
What are the essential substances needed for chemical reactions in cells in the human body?
A
Oxygen, food molecules and water.
2
Q
Why is it important to remove waste products?
A
Certain waste products are toxic if they accumulate and are not removed.
3
Q
How is urea removed?
A
Diffuses from cells into blood plasma and filtered out of the blood by the kidneys to be excreted as urine.
4
Q
How is carbon dioxide removed?
A
Carbon dioxide is removed by diffusing out of the cells and transported to the heart by the circulatory system. It is pumped out of the heart and to the lungs where it is exhaled by the gaseous system.
