Term
| The posterior pituitary stores what hormones? |
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Definition
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Term
| In the breast, there are millions of alveoli, most with sinuses. The area around the sinuses sends signals to the ___ ___ to stimulate hormone secretion. Oxytocin binds to _____ cells and causes them to contract so milk is pushed down into the sinuses. |
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Definition
- anterior hypothalamus
- myoepithelial cells |
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Term
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Definition
- when its time for delivery, the uterus contracts, stretches the cervix, which signals the anterior hypothalamus
- positive feedback mechanism |
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Term
| The uterus is ready for parturitiion when estrogen increases what two things? |
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Definition
- estrogen increases uterine prostaglandin synthesis
- estrogen increases uterine oxytocin receptors |
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Term
| Intercourse stimulates the cervix to send signals to release ___. This hormone appears to be important for the transport of sperm through the reproductive tract. |
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Definition
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Term
| Vasopressin aka ____ ___ ___ increases when: |
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Definition
- antidiuretic hormone (ADH)
- increases when osmolarity rises due to dehyrdation or salt intake
- increases when blood volume falls due to dehydration or blood loss |
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Term
| There are osmoreceptors near the ____. |
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Definition
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Term
| Where are volume receptors? |
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Definition
- in the aorta, superior vena cava, etc.
- when blood volume falls, vasopressin is secreted |
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Term
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Definition
- water reabsorption via increased aquaporins
- blood pressure |
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Term
| Water reabsorption occurs in the ___ ___ via ___ receptors. |
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Definition
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Term
| How does ADH increase blood pressure? |
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Definition
- increases resistance which in turn increases pressure
- arterioles: deltaP= F X R |
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Term
| Too little ADH causes ___ ___. |
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Definition
Diabetes Insipidus
- idiopathic
- may be caused by trauma, surgery, compression, infarction
- Nephrogenic DI
- Drugs and alcohol
- Psychogenic polydipsea |
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Term
| Examples of causes for Diabetes Inspidus: |
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Definition
- car crash where nasal bone destroys pituitary
- tumor blocking pituitary
- Lithium used to treat bipolar disease> ADH receptors don't work anymore
- Nephrogenic DI: genetic defect where ADH receptors never developed
- Psychogenic polydipsia: drinking lots of water b/c think something is wrong with them and want attention |
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Term
| Excessive ADH secretion is aka : |
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Definition
| - Syndrome of Inappropriate ADH secretion (SIADH) |
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Term
| Causes of excess ADH secretion: |
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Definition
| - non-pituitary tumors (lung cancer tumor may cause excess ADH secretion and hypertension) |
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Term
| Effects of excess ADH secretion: |
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Definition
- low plasma osmolarity
- normal to high blood volume
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