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Neuro 041910

Autonomic Nervous System

What are the main messengers of the endocrine system? hormones/chief messenger
what are hormones? biological substances that are secreted into the blood stream/biologic messenger travels thru bloodstream-->bathes all the different groups
Hormones interact with only Specific receptor for that hormone
How do hormones and receptors fit together" key/lock where the hormone binds at the site and them has an effect inside cell depending on hormones function
How does the messenger and or hormone work" many different ways/classic path is via bloodstream, circulates the body/attaches to recptor-->effect cell/ OR via diffusion of cell membrane
What is periquin function? when hormones enter the cell w/o use of receptor/right next hormone is cell
What is the autocrin function? cells feeding onto cells/example is the pancreas/insulin secreted after a meal/the insulin goes back on the islet cell and decreases its own secretion
How does insulin work in terms of diffusion? cell in the pancreas makes insulin=I, I goes out to bloodstream and then feeds back on itself to stop further production of Insulin
When do neurotransmitters N( substance that the axon release across a synaptic gap) can act as hormones? e.g. norepinephrine => depends on the location and situation, it can act as either a H such as the adrenal medulla or N
Where are Hormones made, where do they go? Pituitary, the master gland that makes 9 different hormones, released to bloodstream, then out to other glands, stimulating them to secrete hormones that effect target tissue
What accounts for production and limits their secretion in the Central System? Endocrine Loop=Classical endocrine=Negative or Positive loop is effected as peripheral glands' H levels effect the hypothalamus, how it is effecting the pituitary gland, that goes back to pituitary
Classic endocrine sys. breaks into 2 systems: Central classic + Free standing = the brain & cells in the cortex that influence the Hypothalamus (in ANS, is a way- station b/w other brain cells + the pituitary to make Hormones and the ANS gland.
What is the function of the hypothalamus in the endocrine system? can be effected by hormones and itself effect hormone secretion
How does the Free Standing classic endocrine gland system pancreas (insulin), parathyroid (4 small glands that sit behind thyroid in the neck)
Non-classic organs/endocrine glands fat cells (secrete H leptin=appetite); stomach (secretes H grellin =stim. appetite); heart (in its walls called atrol..peptide
Homeostasis? Balance of electrolytes, weight, fluid level there's movement and modulation
Relationship b/w the pituitary and hypothalamus different nuclei make NT help the ant. pituitary to control, effect, modulate: anterior helps the secretion of HL TRH influences TSH
Anterior Pituitary-nuclei make NT-> released into bloodsupply (hydro..oit vascular sys) influence the secreting of the ant. Pit hormones leave capillaries and act on hormone-secreting ant. pituitary cells through the capillaries (p415) secretes Hs: Growth Hormone; TSH thyroid stimulating H; Follicle stimulating; Lutenizing H LH (both stim. gonad secretion); Prolactin (mammory); Adrenocorticotrophic ACTH (stimulate adrenal cortex);
record 13"40= cascade system hormones affect the anterior pituitaryTRH thyroidtropin releasing H. ->
Feedback loop (above) ie thyroid hormone is low=>hypo releases TSH (releasing hormone)that stimulates Posterior Pituitary gland - nerve bodies that have axons terminals at back of Pit which secrete hormones at the synapses= in a Cascade system-
Posterior Pituitary have long nerve bodies and secrete Vasopressin (control water retention) and Oxytocin (milk producing and uterus contraction)
What determines the secretion of oxytocin and vasopressin? in the supraventricular and perioptic nuclei of the hypothalamus (where it is released) in a direct route
Where is the thyroid hormone made? @ back of the hypothalamus to produce TRH to affects secretion TSH to produce thyroid Hormone secretion comes back and effects Pituitary to
How do you assess set points for thyroid function? range of set points w/in for normal =0.4 and ;affects metabolic rate, when thyroid levels are turned up/down=fast or slow T4=four molecules of iodine parameters by which endocrine levels are maintained
=TRF thyroid releasing triggers TSH
Created by: cdsfah