BIO 11 Study Guide - Midterm Guide: Parathyroid Gland, Pineal Gland, Cell Membrane
Document Summary
Endocrine glands possess no excretory ducts and their secretions are usually released into interstitial tissue to be picked up by blood and lymph cartilage. The nervous system is faster because the neurotransmitters are stored in the pre synaptic tissue and released immediately in the synapse when needed; act impulsively. Exactly related to amino acids - basic building blocks of proteins. Fewer amino acids than amino acids hormones/proteins polypeptide chains ; inactive hormones when they are made. Act on receptors inside the cell which directly activate genes can enter the cell because they are lipid soluble. Act on receptors in the plasma membrane; receptors are usually coupled via regulatory molecules called g proteins to one or more intracellular second messengers which mediate the target cell"s response. Have to act on the plasma membrane because they cannot enter the cell. Local control of tissues - something happened here, local release glands release hormones; global issue.
