HW #45 - APBiologyPeriod4#22LiemNguyen...

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AP Biology Period – 4  #22 Liem Nguyen 3/23/10 Homework #45 (090403): Chapter 45 (due Friday 090403) Total points: 40 for Attempt on all questions Concept Map: 10 Points Chapter 45:Hormones and the Endocrine System Objectives An Introduction to Regulatory Systems 1. Compare the response times of the two major systems of internal communication: the   nervous system and the endocrine system. - Nervous system - endocrine system - internal regulation - internal communication Rapid messages control the movement of body parts in response to sudden environmental  changes. hormones secreted from the endocrine system coordinate slower but longer  acting response to stimuli are produced and they also regulate long term developmental  process.  2. Explain how neurosecretory cells, epinephrine, and control of day/night cycles illustrate   the integration of the endocrine and nervous systems. - neurosecretory cells - epinephrine - control of day night cycle - intergration Neurosecretory cells release hormones into the blood via the extracellular fluid. Certain  hormones such as epinephrine integrate hormonal functions of both endocrine and nervous  system. As a hormone, epinephrine functions in the vertebrate body as a flight for fight  response and conveys messages in the nervous system as a neurotransmitter. Another  integration of endocrine and nervous system is the control of the day night cycle.
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3. Describe the organization of a stimulus, receptor, control center, efferent signal, and   effector in a simple endocrine pathway. - stimulus, receptor  - organization of endocrine pathway  - control center, efferent signal, effector The receptor detects a stimulus and sends the information to a control center. The control  center then sends out a signal that directs an effectors to respond. In the endocrine  pathway the outgoing signal is called an efferent signal, which elicits certain changes.  4. Describe an example of a negative feedback loop in an endocrine pathway involved in   maintaining homeostasis. - feedback loop - initial stimulus - negative feedback This is preventing overreaction by the system and wild fluctuations in the variable being  regulated. The control pathways have a feedback loop connecting the response to the  initial stimulus. The pathway for homeostasis is based on  negative feedback, and the  effector response reduces the initial stimulus. 5. Explain why the neurohormone pathway that regulates the release of milk by a nursing   mother is an example of positive feedback.
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