Biology Questions and Answers
osmolarity, there is stimulus for ADH
secretion.
When the body has an excess of water,
as in cases of excessive inabnormally low blood osmolarity, thgestion or ine
secretion of ADH is blocked and the
diuresis increases. ADH is also kvasopressin since it increases the bloodnown as
volume and thus heightens the blood
pressure.
- Why does the ingestion of
alcohol increase diuresis?
Alcohol (antidiuretic hoinhibits the secretiormone) by the pituitary.n of ADH (^)
That is why when it is drunk to excess
the person urinates too much.
- How does aldosterone act
and where is it produced?
Aldosteronthe nephron tubules stimulating te is a hormone that actshe upon
resorption contributes to tof sodium. he increase oTherefore itf the blood (^)
osmolarity and consequently to the
increase of the blood pressure.
Aldosterone is made by the adrenals,
glands locateof the kidneys.d over the superior portion
- What is an evolutionary
explanatory hypothesis for the
secretion by the heart of a
hormone that regulates the
renal function? Which is that
hormone?
The renal regulator hormone secreted
by the heart is the atrial natriufactor (or ANF). The ANF increases theretic (^)
excretion of sodium in the nephron
tubules causing lmore urinary volume, ess resorptioand thus lown of water,ering
the blood pressure. factor is secreted when there is anThe atrial natriur etic
increase of the length of the heart
muscle fibers in rpressure. The ANF is a nesponse to aturalhigh blood
antihypertensive substance. Since the
health oupon the stabilityf the heart depends larg of the normal bloely (^) od
pressure the evolution should have
preserved the atrial natriureticallow information from the heart to be factor to
an additional mechanism for the renal
control of the blood pressure.
- What is hemodialysis?
Hemodialysisfiltration made by specific machines i is the artificial blood (^) n
substitutionHemodialysis of the kidneys. may be necessary in (^)
patients suffering from diseases that
cause renal failure, like dcomplications, lupic renal complicationsiabetic renal (^)
and others. During hemodialysis the
blood of the patient is deviated to thfiltering machine and after the filtratione (^)
it returns to the body.
Hemodialysisthree or more times a week in a process is generally done two, (^)
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