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.
Afferent nerve. Definition. noun, plural: afferent nerves. The type of nerve that carries sensory nerve impulses from the periphery towards the central nervous system. Supplement. The peripheral nervous system of vertebrates has two main types of nerves. These are the efferent nerves and the afferent nerves.oun, plural: afferent nerves. The type of nerve that carries sensory nerve impulses from the periphery towards the central nervous system. Supplement. The peripheral nervous system of vertebrates has two main types of nerves.