Blood Types

The ABO blood group has 4 blood types which include A,B,AB, and O

Type A- Have an antigen on the surface of red blood cells also have antibody B in their plasma
Type B- Have antigen B on the surface of the red blood cells. If an indiviual with type A blood is given type B blood the antibody B in the recipents blood will combine with the red blood cells of the donor blood due to the fact that those cells have antigen B on the surfaces
Type AB-Indiviuals with type AB blood have both antigen A and antigen B on the surface of their red blood cell they don't have antibody A or B in their plasma. AB blood donors are called universal recipents because most of them can accept all ABO blood types
Type O-Indiviuals with type O don't have antigen A or antigen B on the surface of the red blood cells. people with type O are called universal donors because their blood can be given to most people

Male Reproductive System

The male reproductive system is in charge of developing sperm, to discharge sperm within the female during sex and to produce and secrete male hormones for maintaining the male reproductive system most of the male reproductive system is located outside of the body. These external structures include the penis,scrotum, and testicles.

 the male organ used in sexual intercourse.The Penis has  three parts: the root, which attaches to the wall of the abdomen the body, and the glans, which is the cone-shaped part at the end of the penis. The glans also known as the head  is covered with a loose layer of skin called foreskin. This skin can be removed in a procedure called circumcision.  The urethra is the tube that transports semen and urine, is at the tip of the penis. The Scrotum is a pouch of skin that holds the testes it hold s the testes away from the rest of the body which keeps the temperature lower than rest of the body for the viability of sperm. The testes are the primary organs of the male reproductive system because they produce the sperm. Most men have two testes. The testes are responsible for making testosterone. 

The head of the sperm contains 23 chromosomes and is covered with an enzyme filled sac called acrosome. the mitochondria (mid piece) generates the energy the cell needs to move. The tail is a flagellum that propels the sperm forward in the female reproductive tract