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 neuron-a neuron conducting impulses inwards to the brain or spinal cord. sensory neuron. nerve cell, neuron-a cell that is specialized to conduct nerve impulses. afferent, afferent nerve, sensory nerve-a nerve that passes impulses from receptors toward or to the central nervous system.oun. 1. afferent neuron-a neuron conducting impulses inwards to the brain or spinal cord. sensory neuron. nerve cell, neuron-a cell that is specialized to conduct nerve impulses. afferent, afferent nerve, sensory nerve-a nerve that passes impulses from receptors toward or to the central nervous system.