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| pertaining to an involuntary response to a stimulus, in which the nerve impulse from a receptor is transmitted inward to a nerve center, then transmitted outward to an effector |
| acting independently of or done or occurring without volition |
luteal phase n.
The portion of the menstrual cycle that begins with the formation of the corpus luteum and ends with the start of the menstrual flow, usually 14 days in length.