Additional causes of bleeding in early pregnancy include: 1  Cervical changes. During pregnancy, extra blood flows to the cervix. 2  Infection. Any infection of the cervix, vagina, or a sexually transmitted infection (such as chlamydia, gonorrhea, or herpes) can cause bleeding in the first trimester.
A: Afferent neurons are special nerve cells that are responsible for carrying nerve impulses from the receptors to the central nervous system. Efferent neurons carry nerve impulses from the central nervous system to the muscles and glands. Continue Reading.
There are t â¦ wo types of neurons: afferent and efferent. Afferent neurons are the ones that receive stimulus and send it to the spinal cord or the brain. Efferent neurons are the ones that send information from the brain to the different parts or organs in the body.