Preoptic Area
Also written as GABA.
GABA from preoptic area: Primary sleep-promoting neurotransmitter that inhibits arousal systems
What our notes say
- GABA from preoptic area: Primary sleep-promoting neurotransmitter that inhibits arousal systems (Sleep Physiology Examination Paper)
- Inhibition of sleep-promoting GABA neurons in preoptic area (Sleep Physiology Examination Paper)
Study material on Preoptic Area
- Sleep Physiology Examination Paper
- Weekly Year 2: Physiology Exam - May 29, 2026 (Section A: MCQs)
- Weekly Year 2: Physiology Exam - May 15, 2026 (Section A: MCQs)
Practice questions on Preoptic Area
The posterior and lateral hypothalamus, in combination with the preoptic area, are involved in the control of which of the following functions?
- Cardiovascular functions involving blood pressure and heart rate
- Regulation of thirst and water intake
- Stimulation of uterine contractility and milk ejection from the breast
- Signaling that food intake is sufficient (satiety)
- Secretion of hormones from the anterior lobe of the pituitary gland
Answer: B. The posterior and lateral hypothalamus, along with the preoptic area, are key regions involved in osmoregulation and thirst control. These areas contain osmoreceptors that detect changes in blood osmolality and initiate appropriate responses including thirst and ADH release. The other functions are controlled by different hypothalamic regions. ---
Which neurotransmitter is inhibitory and promotes sleep when released from the preoptic area?
- Glutamate
- Histamine
- GABA
- Orexin
- Primarily an incidental laboratory finding
Answer: C. GABA neurons in the preoptic area of the hypothalamus are sleep-promoting and inhibit arousal systems. ---
The posterior and lateral hypothalamus, in combination with the preoptic area, are involved in the control of which of the following functions?
- Thermoregulation
- Sleep-wake cycles
- Hunger and satiety
- Reproductive behaviors
Answer: A. The hypothalamus, including the preoptic area, posterior, and lateral regions, plays a critical role in maintaining homeostasis, with significant involvement in thermoregulation (both heat loss and heat conservation mechanisms). While other functions listed are also hypothalamic functions, thermoregulation is a primary role for this specific combination of areas.
The posterior and lateral hypothalamus, in combination with the preoptic area, are involved in the control of which of the following functions?
- Thermoregulation
- Sleep-wake cycles
- Hunger and satiety
- Reproductive behaviors
Answer: A. The hypothalamus, including the preoptic area, posterior, and lateral regions, plays a critical role in maintaining homeostasis, with significant involvement in thermoregulation (both heat loss and heat conservation mechanisms). While other functions listed are also hypothalamic functions, thermoregulation is a primary role for this specific combination of areas.
The posterior and lateral hypothalamus, in combination with the preoptic area, are involved in the control of which of the following functions?
- Motor coordination
- Auditory processing
- Thermoregulation and feeding behavior
- Visual processing
Answer: C. The hypothalamus, including the posterior, lateral, and preoptic areas, plays a central role in regulating fundamental homeostatic functions such as body temperature (thermoregulation) and appetite/satiety (feeding behavior).
The posterior and lateral hypothalamus, in combination with the preoptic area, are involved in the control of which of the following functions?
- Motor coordination
- Auditory processing
- Thermoregulation and feeding behavior
- Visual processing
Answer: C. The hypothalamus, including the posterior, lateral, and preoptic areas, plays a central role in regulating fundamental homeostatic functions such as body temperature (thermoregulation) and appetite/satiety (feeding behavior).