Right: Vaginal lubrication sometimes becomes visible after sexual arousal. Vaginal lubrication is a naturally produced fluid that lubricates a woman's vagina. Vaginal lubrication is always present, but production increases significantly near ovulation and during sexual arousal in anticipation of sexual intercourse.
Marie Iannotti. Definition: A basal leaf is one that grows from the lowest part of the stem. Basal, in general, refers to the base of a structure. Many perennial plants are trimmed back to new basal foliage once the older foliage starts to look tired and worn.
The veins of a leaf can be arranged in three different ways. In pinnate leaves the veins all branch off the main vein which runs the length of the leaf. In palmate leaves the veins radiate outward from the base of the leaf like fingers spreading out from the palm of a hand. In parallel-veined leaves, the veins all run parallel from the base of the leaf to the tip. Most leaves have a petiole or a central stalk by which they are attached to the stem. Sessile leaves have no central stalk and are attached directly to the stem. Learn more about Botany.