Usually if we are talking about needles and body fluids, They are usually put into a box that is labeled hazard! And they dispose of the materials in a special trash can! :) Hope this helps!
Answer:
It means that the cell membrane allows certain substances to pass through and not others. As the cell membrane consists of a phospholipid bilayer with a hydrophobic core, only small uncharged hydrophobic molecules can pass through the cell membrane e.g. glucocorticoid and other larger charged particles require transporters or channel proteins to pass through the cell membrane, e.g. glucose.
Unoxygenated blood from veins enters the right atrium then it goes down to the right ventricle then out through the pulmonary artery to the lungs where it becomes oxygenated blood which then enters the heart through the pulmonary veins and it goes to the left atrium and then is pumped down to the left ventricle and out through the aorta to the arteries where it travels to different organs and becomes deoxygenated and then the cycle repeats itself.
I don't really understand your statement
The statement would be "An Error during S phase is corrected during the G2 Phase"
S phase is used to describe DNA Replication ,
In G2 Phase, the cells are making sure that all the problems are fixed before they enter mitosis. It's common for the cells to do apoptosis (cell suicide) if they cant fix the error
