Halacha 1 states that uterine blood imparts impurity whether it is moist or dry, unlike zav discharge and saliva which only impart impurity when moist.
Question 2
If a zav bites into a cucumber or zucchini, what is the status of the food?
Halacha 4 rules that if a zav bites into a zucchini or cucumber, one who moves them is impure — because the vegetable liquid draws out the zav's saliva.
Question 3
After how many washings does the fluid from a urinal used by a zav become pure?
Halacha 8 states that after the third washing — whether with water or any other liquid — the fluid is deemed pure.
Question 4
Do gentile women contract nidah impurity by Torah law?
Halacha 10 states that gentiles do not contract nidah or zivah impurity by Torah law, but the Sages decreed they are considered like zavim at all times.
Question 5
When impure blood mixes with pure blood or wine, how do we determine the status of the mixture?
Halacha 6 rules: when impure blood mixes with pure blood and/or wine, we consider the wine and the pure blood as if they do not exist and examine whether the mixture still appears as blood.