8.the following one is considered as safety rule in laboratory 1 point

never eat or drink anything in the science lab

always clean up when you have finished the experiment

wear safety goggles while doing experiments

all the above​

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.