Always have a friend to make things more fun
Answer:
1 = veins
2 = cardiovascular system
3 = fibrin
4 = target heart rate
5 = maximal heart rate
Answer:
Metabolic wastes or excretements are substances left over from metabolic processes (such as cellular respiration) which cannot be used by the organism (they are surplus or toxic), and must therefore be excreted.
This is what i found out i hope this is a good enough answer!! :P
