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Ch.5 Chemical Messen

Stanfield Chemical Messengers

QuestionAnswer
All amino acid chemical messengers function as: Neurotransmitters
Most chemical messengers fall into the following chemical classes: Peptides/proteins
All steroid chemical messengers function as Hormones
What causes a rise in intracellular cAmp levels? Stimulation of adenylate cyclase activity
Which binds to intracellular receptors? Steroids only
The response of a target cell to a messenger depends on what? The concentration of the messenger, concentration of receptors on target cells and an affinity of the receptor for the messenger
G-proteins are involved whenever: binding of ligand molecules to cell surface receptors triggers synthesis of second messengers.
Cells that secrete a messenger are called _____________. Secretory
A paracrine or autocrine agent acts on the same cell that secretes it? Autocrine
Endocrine glands release __________ into the__________ where it travels to the target cell. Hormone, blood
An active G-protein releases the __________ subunit, which interacts with another membrane protein, altering its activity. Alpha
The enzyme that catalyzes conversation of ATP to cAMP is called: Adenlyatecyclase
____________ messengers exert their effect on target cells by activating or inactivating specific genes. Lipophillic (fat-loving)
Examples of locally acting chemical messengers are steroids or eicosanoids Eicosanoids
Cytosolic calcium often exerts the effect by binding cytosolic ________ . Calmodulin
Lipophobic messengers are secreted by __________. Exocytosis
Amino acids are ___________. Neurotransmitters
The __________ system is a more rapid means of communication. Nervous
Created by: n2biology
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