NATS 1675 Lecture Notes - Parathyroid Gland, Cyclic Adenosine Monophosphate, Thyroid
7 Feb 2013
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Document Summary
Hormones are chemical messengers: coordinate and manage activities of the body"s cells, responsible for growth, development and maturation, secreted by endocrine glands or endocrine cells or neurons. Enter blood stream and travel to target cells. Target cell = the cell which is affected by that hormone. Hormones can have multiple target cells: effect of hormone varies based on which target cell it is sent to, two types of hormones: Can pass through cell membranes (lipid bi-layer) Can"t pass through cell membrane without being actively transported. Example: peptide hormones: hormones function by way of protein receptors, who receive, interpret and carry out the desired action, varying mechanisms of change/action, depending on type of hormone. Diffuses through the target cell"s lipid bilayer membrane. Hormone-receptor complex triggers gene activity in dna. Strand of mrna is made to complement that gene section of dna. Diffuses from blood to the area where the target cell is located. Binds to protein receptor on target cell"s membrane.
