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.
Noun. 1. afferent-a nerve that passes impulses from receptors toward or to the central nervous system. afferent nerve, sensory nerve. dorsal horn, dorsal root-one of the two roots of a spinal nerve that passes dorsally to the spinal cord and that consists of sensory fibers.oun. 1. afferent-a nerve that passes impulses from receptors toward or to the central nervous system. afferent nerve, sensory nerve. dorsal horn, dorsal root-one of the two roots of a spinal nerve that passes dorsally to the spinal cord and that consists of sensory fibers.