Principles of Endocrinology- Circadian Rhythms- Calcium Control

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Physiology

Hormones are released from these glands and go into the blood.

Endocrine

Plasma Hormone Concentrations are controlled by

feedback mechanisms

These hormones can change concentration rapidly (mins)

Hydrophilic

These hormones often partition into adipose tissue

Hydrophobic

Neural activation can produce a rapid (increase or decrease) in hormone release.

increase

An endocrine disorder where there is no response from normal hormone levels

Target cell malfunction

What is down regulation?

Desensitization due to chronic, elevated hormone levels

This type of diabetes has down regulation of insulin receptors

Type II

What is permissiveness

when one hormone enhances the response of a second hormone.

TH increases _________ reception on target cells

Epinephrine

What is synergism

when 2 hormones increase each others activity

what two hormones help each other increase sperm production

FSH & testosterone

What is antagonism

When one hormone reduces the effect of another hormone

The pineal gland releases this hormone to help regulate circadian rhythm

melatonin

Biological clocks are controlled by

superchlasmic nucleus in the hypothalamus

Melatonin release is controlled by

light

90% of phosphate is stored where

bones

99% of calcium stored in the bones is stored as

calcium phosphate

What hormone increases resorption of calcium

parathyroid hormone

Hypocalcemia is

low blood calcium

Calcium absorption is controlled by what vitamin

vitamin D

Osteoporosis is linked to a decrease in this hormone

estrogen

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