LBL-12. Endocrine system (Ch 25-Iceman-1) pp454 PDF

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Download LBL-12. Endocrine system (Ch 25-Iceman-1) pp454 PDF

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BIOL 102 Biology Now - 2018

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Chapter 25: Testing the Iceman (Endocrine system) pp 454-459 Answer the questions below as you read the narrative of the chapter.

1. Quick reminder: What does the Iceman (Wim Hof) claim to be able to do? He could consciously modulate his autonomic immune system and his nervous system. Hormonal Changes 2a. What are hormones? Hormones are signaling molecules produced by certain cells that tell other cells what to do under specific situations or at certain times in the life cycle of the individual. 2b. What is the fastest a hormone can arrive at its target tissue? They can only travel as fast as blood moves. Can take several seconds. Study Figure 25.4. 2c. How do hormones travel to target cells? Released by endocrine cells travel through the circulatory system and produce a response in target cells. Travel through the blood. 2d. What are the two locations where hormones find their receptors? Plasma membrane and cell surface receptor 2e. Use cortisol as an example to illustrate what is meant by “signal amplification” Even a little bit of cortisol can produce large internal signals within the target cell, which release rapid physiological responses. Brain-Body Connection 3a. Which two tissues comprise the “brain-body” connection? Hypothalamus and the nervous system Using the narrative and Figure 25.6 as a guide, Answer the following questions to trace the physiological pathway by which stress hormones direct their effects: 3b. What is the stimulus that starts the process? Stress and/or fear 3c. What is the tissue responding to the stimulus by releasing hormones? Adrenal Glands 3d. What are the hormones released? Adrenaline and noradrenaline 3e. What is/are the target tissues? Liver cells and heart cells 3f. How do these tissues respond when the hormone binds to their receptors? -Liver cells break down their stores of glycogen to produce glucose, which increases the amount of fuel -Heart muscles contract and relax faster, increasing the rater of blood flow in the body...