Regulatory Systems

This set of flashcards covers key concepts related to regulatory systems, focusing on the autonomic nervous system, hormone signaling, interoception, and the hypothalamus's role in homeostasis.

What are the primary components of the autonomic nervous system?

The sympathetic and parasympathetic nervous systems.

What role do hormones play in brain-body signaling?

Hormones regulate homeostasis and signaling in the body.

What is an example of a hormone involved in homeostasis?

Leptin.

Which systems provide feedback about internal organs?

The interoceptive system.

What reflex decreases respiratory rate when lungs are stretched?

Hering-Breuer reflex.

What happens to cell metabolism during hypoxia?

It shifts from aerobic respiration to anaerobic glycolysis.

What is the function of Gpr65 and Glp1r receptors in vagal sensory neurons?

Gpr65+ neurons sense gut nutrients; Glp1r+ neurons sense stomach stretch.

How does the hypothalamus maintain homeostasis?

Through feedforward and feedback mechanisms affecting physiology and behavior.

What is the function of neuroendocrine neurons in the hypothalamus?

They signal to pituitary neurons and release hormones into the bloodstream.

What types of experiments suggested feedback signals inhibit eating?

Hypothalamic lesion and parabiosis experiments.

What mutation is found in Ob/Ob mice?

A mutation in the leptin gene.

What do Db/Db mice lack?

Leptin receptors.

What effect does leptin treatment have on Ob/Ob mice?

It decreases food intake and body mass.

What is the role of POMC neurons in eating regulation?

They are key regulators of appetite and energy balance.

What is the role of AgRP neurons in eating regulation?

They stimulate appetite.

What anatomical structures are involved in the autonomic nervous system?

Preganglionic and postganglionic neurons, effector cells.

How are sympathetic and parasympathetic systems interrelated?

They have complementary roles in regulating physiology.

What neurotransmitter is primarily used by the sympathetic nervous system at the preganglionic synapse?

Acetylcholine.

What type of feedback does the interoceptive system provide?

Feedback about states of internal organs.

Which organ system's regions are highly interconnected within the CNS?

Sympathetic and parasympathetic systems.

Which neurons encode different types of visceral information?

Different populations of vagal sensory neurons.

What experiment connected the circulatory systems of two animals?

Parabiosis experiment.

What role does the hypothalamus play in regulation?

It regulates diverse homeostatic processes.

What is leptin's effect on humans lacking it?

It decreases body mass.

What feedback mechanism helps the hypothalamus maintain body temperature?

Physiological changes in response to internal signals.

What anatomical feature of the hypothalamus aids in its function?

Different subregions or nuclei that are interconnected.

What ion channels are involved in the Hering-Breuer reflex?

Stretch receptor Piezo2.

How does hypoxia affect the activity of petrosal ganglion neurons?

It activates neurons via Or78.

Why are AgRP neurons important for weight regulation?

They stimulate appetite and food intake.

What is the role of the hypothalamus in relation to the pituitary gland?

It regulates hormone secretion through the pituitary.

What types of changes does the hypothalamus coordinate to maintain homeostasis?

Physiological and behavioral changes.

What kind of research helped discover leptin's role in body weight?

Studies of mutant mice.

How does the sympathetic nervous system respond to stress?

By activating the fight or flight response.

What physiological state does the parasympathetic nervous system promote?

Rest and digestion.

What does the interoceptive feedback enable the brain to do?

Respond to the sensory signals from internal organs.

In the context of neuroendocrine signaling, what distinguishes the anterior from the posterior pituitary?

The anterior pituitary receives signals from the portal system; the posterior releases hormones directly.

What is one method that researchers use to study hunger signals in relation to leptin?

Analyzing mutations in leptin pathway genes.