the actions of some hormones on target cells require a simultaneous or recent exposure to a second hormone. The second hormone is said to have this effect.
when the effect of two hormones acting together is greater or more extensive than the effect of each on its own, the two hormones have this effect.
when one hormone opposes the actions of another hormone.
is regulated by 1) signals from the nervous system 2) chemical changes in the blood 3) other hormones
secretes several hormones that control endocrine glands
controls the pituitary gland. It is the major link between the nervous system and the endocrine system
the stalk that attaches the pituitary gland to the hypothalamus
anterior pituitary gland
accounts for 75% of the total weight of the gland. It secretes hormones that regulate a wide range of bodily activities from growth to reproduction
stimulate the release of anterior pituitary hormones
suppresses the release of pituitary gland hormones. Produced by the hypothalamus
Hypophyseal portal system
blood flows from capillaries in the hypothalamus into the portal veins that carry blood to capillaries of the anterior pituitary gland.
clusters of specialized neurons. They synthesize the hypothalamic inhibiting and releasing hormones in their cell bodies and package the hormones inside vesicles which are eventually released into the Hypophyseal portal system
human growth hormone(hGH)
released by the anterior pituitary gland. It is secrete by somatotropins
GhRH- growth releasing hormones
A hypothalamic hormone which promotes secretion of human growth hormone
GHIH- growth inhibiting hormone
suppresses the secretion of human growth hormone
Thyroid stimulating hormone (TSH) or thyrotropin
stimulates the synthesis and secretion of the two thyroid hormones T3 and T4, both produced by the thyroid gland. Produced by the anterior pituitary gland
TRH-thyroid releasing hormone
from the hypothalamus controls TSH secretion. Release of it depends on blood levels of T3 and T4
Follicle-stimulating hormone (FSH)
target the ovaries. It initiates the development of several ovarian follicles. It also stimulates follicular cells to secrete estrogen and sperm in males. Produced by the anterior pituitary gland
released from the hypothalamus and stimulates FSH and LH release
luteinizing hormone (LH)
triggers ovulation in females and the secretion of estrogen. In males it stimulates the testes to secrete testosterone. Produced by the anterior pituitary gland
initiates and maintains milk secretion by the mammary glands, only after mammary glands have been prepared by other hormones does it bring about the secretion of milk. Produced by the anterior pituitary gland
PIH- prolactin inhibiting hormone
produced by the hypothalamus, they regulate PRL secretion. In females it is dopamine. Just before menstruation this hormone diminishes.
PRH- Prolactin releasing hormone
the sucking action of nursing infants causes a reduction of hypothalamic secretion of PIH
Adrenocorticotropico hormone - ACTH
these are secreted by corticotrophs. This hormone controls the production and secretion of cortisol and other glucocoticords by the cortex of the adrenal gland
CRH- corticotropin-releasing hormones
from the hypothalamus. Stimulates the secretion of ACTH by corticotrophs. stress related stilmuli, such as low blood glucose or physical trauma also stimulate the release of ACTH
melanocyte-stimulating hormone (MSH)
increases skin pigmentation in apmphibians. Not sure why it is present or what it does in humans. Produced by the anterior pituitary gland