BIO 250- Lecture Exam 3 || Already Passed.

They share the same purpose; internal communication. Some chemicals act as both hormones and neurotransmitters, and the two systems regulate each other correct answers Distinguish between the nervous and endocrine systems. "to arouse", long distance; travel in blood or lymph. Chemical messengers that are secreted by endocrine glands/tissues into the blood. correct answers What is a hormone? organs/cells with specific receptors correct answers What is a target organ? Hormonal, humoral, neural correct answers Explain how various endocrine glands are stimulated to release their hormonal products. (3 types of stimuli) One endocrine organ stimulates another organ correct answers What is a hormonal stimulus? Blood concentrations stimulate secretion correct answers What is a humoral stimulus? Nervous system can stimulate secretion in some organs correct answers What is a neural stimulus? Hormones arouse cells, or alter cellular activity. Typically, one or more of the following occurs: 1. Changes in plasma membrane permeability or electrical state 2. Synthesis of proteins, such as enzymes 3. Activation or inactivation of enzymes 4. Stimulation of mitosis 5. Promotion of secretory activity correct answers Describe how hormones bring about effects in the body. What is negative feedback? correct answers A response to a change in the body that counteracts or opposes the initial change (household thermostat) 1. hormone levels in the blood are mostly maintained by negative feedback 2. a stimulus or low hormone levels in the blood triggers the release of more hormone 3. hormone release stops once an appropriate level in the blood is reached correct answers What is the role of negative feedback in regulating blood levels of various hormones? Ductless, release into blood correct answers What are endocrine glands? Release secretions onto a tissue by ducts correct answers What are exocrine glands? !!!!! correct answers Be able to identify the major endocrine glands and tissues Vasopressin- stimulates water retention, raises blood pressure