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.
â¢ Afferent neurons have a single long dendrite and a short axon whereas efferent neurons have a single long axon and several dendrites. â¢ The cell body of afferent neuron is perfectly rounded and smooth whereas that of efferent neuron is satellite shaped.