Comparative Vertebrate Physiology - PowerPoint PPT Presentation

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Title:

Comparative Vertebrate Physiology

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Title: Comparative Vertebrate Physiology Author: WCU Last modified by: giovanni Created Date: 1/23/2001 5:45:16 PM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Comparative Vertebrate Physiology


1
Comparative Vertebrate Physiology
  • Homeostasis

2
Course Outline
  • Systems
  • Nervous, Muscular, Circulatory, Respiratory,
    Osmoregulatory, Digestive, Reproductive
  • Processes
  • Thermoregulation
  • Metabolism

3
Course content
  • Structure - what does it look like?
  • Function- how does it work?
  • How and Why?
  • The comparative approach

4
Homeostasis
5
Homeostasis
  • Claude Bernards concept
  • All organs interact
  • All cells of organs bathed in internal fluid
  • Cells exist if fluid remains constant in quantity
    and quality - quality affects quantity
  • Fluctuations occur within narrow limits

6
Feedback mechanisms
Disturbance
Negative feedback
-
Control system
Sensor
Error signal
Inverted amplifier
Set point adjustment
7
Negative feedback
  • Beneficial - Example perspiration
  • Doesnt prevent displacement
  • Restores stability close to operating parameters

8
Feedback mechanisms
Disturbance
Positive feedback

Signal
Control system
Sensor
Amplifier
Output
9
Positive feedback
  • Rare and mostly destructive
  • e.g. congestive heart failure
  • Some are beneficial
  • e.g. vomiting

10
Control systems
Response
Stimulus
Integration (CNS)
Effector (muscle, gland)
Receptor (cell)
Afferent
Efferent
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