Chapter 4 Bio

Difference between stimulus-response model and reflex arc

stimulus response model involves consious decision while relex arc is automatic and involuntary

Most active organ to secrete ADH

pituitary gland

Excess t4

continuous T4 production would signal the brain to reduce TRH and TSH.
Eventually t4 production reduces and some cases=hypothryoidism

Thyroid

regulates metabolism, growth and heat

Reabsorption of Water

More reabsorption= More Hormone ADH


More reabsorption- in loop of henle, ions surround it and draw in water through osmosis which = less concentrated urine

Descending Loop of Henle

permeable to water, not to salts

internal fluid becomes hypertonic and results in concentrated urine

Ascending Loop of Henle

permeable to salts, not to water