Neural Control Connections to Other NEET Topics

Key Cross-System Points for NEET:

Neural-Endocrine Integration:

• Hypothalamus = master controller of BOTH nervous system homeostasis AND anterior pituitary (via portal blood: GnRH, TRH, CRH, GHRH, somatostatin)
• Posterior pituitary stores hypothalamic hormones: ADH (water reabsorption), Oxytocin (uterine contractions, milk ejection)
• Stress → hypothalamus → anterior pituitary → cortisol (HPA axis): neural stimulus → hormonal response

Neural-Muscular Integration:

• Motor neuron (lower MN) → ACh → nicotinic receptor → end-plate potential → muscle contraction
• Cerebellum coordinates muscle activation patterns $\frac{agonist}{antagonist timing}$
• Sensory feedback from muscle spindles → spinal cord → cerebellum → refined motor output

Neural-Cardiac Integration:

• SA node has intrinsic rate (~100 bpm); parasympathetic (vagus) slows to ~70 bpm (resting HR)
• Sympathetic accelerates: catecholamines on beta-1 adrenergic receptors
• Athletes: high vagal tone → resting HR can be 40-50 bpm