B
White blood cells
Not very likely. First, the person would have to have AIDS and second your hand would have to have a cut or crack for the infected blood to enter into you.
right atrium
when female anopheles mosquito take a blood meal from a host with malaria, the mosquitoe took the malaria bacteria's gametes with the blood meal. the gamestes fused together in the mosquitoe's gut forming the infected stage. if the mosquito then bit a non infected human host, the infected stage of the bacteria will enter the bloodstream vai the salivary gland of the mosquito.
veins
somewhere
The blood enter first to superior and inferior vena cava after the vena cava it will enter to right atrium
Right Atrium.
Oraganisms can enter the body through skin contact, nasal inhalation and putting things in your mouth. They can also enter an open wound very easily making it infected. Your bodys primary barrier is the skin and are secondary barrier is our white blood cells. White blood cells attack bacteria and virus's in to ways, the first being ingulfing the bacteria and killing and the second being creating antibodies that surround the bacteria and quickly kill them.
At the right atrium.
It enters the arteries.
left ventricle