Comparative%20Vertebrate%20Physiology - PowerPoint PPT Presentation

View by Category
About This Presentation
Title:

Comparative%20Vertebrate%20Physiology

Description:

Comparative Vertebrate Physiology ... Blood pathway (Spiral valve) ... Heart sound (closure of aortic and pulmonary valves, ... – PowerPoint PPT presentation

Number of Views:126
Avg rating:3.0/5.0
Slides: 26
Provided by: WCU50
Learn more at: http://darwin.wcupa.edu
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Comparative%20Vertebrate%20Physiology


1
Comparative Vertebrate Physiology
  • Cardiovascular systems in vertebrates

2
Fish
  • Heart anatomy

3
Fish
  • Blood flow pathway

4
Amphibians
  • Heart anatomy (spiral fold)

Blood pathway (Spiral valve)
5
Reptiles
  • Heart anatomy
  • Ventricle divided into 3 chambers

6
Reptiles
  • Blood flow pathway (non-crocodiles)
  • Advantage during diving

7
Reptiles
  • Crocodiles
  • Heart anatomy
  • Foramen of Panizza

8
Reptiles
  • Blood flow pathway
  • Advantage during diving

9
Birds
  • Heart anatomy
  • Renal portal shunt

10
Mammals
  • Heart anatomy
  • 4 chambers
  • AV valves
  • tricuspid, bicuspid
  • Semilunar valves
  • aortic, pulmonary

11
Conduction pathway
  • Myogenic pacemaker

12
Conduction pathway
  • Excitation sequence

13
Heart rate fluctuations
  • Sympathetic parasympathetic influence

14
Pacemaker potential
15
Cardiac action potentials
  • Amplitude, configuration and duration of APs
    differ at different sites of the heart

16
Refractory period
  • Prolonged

17
Refractory period
  • Prolonged Ca and K permeability

18
Ectopic pacemaker
  • Extra heartbeat followed by a pause

19
Electrocardiogram
20
Ectopic pacemaker
  • Cause AV node taking over role of damaged SA
    node

21
Ectopic pacemaker
  • Cause blockage of conductive pathway

22
Cardiac cycle
  • Systole/diastole
  • Mid-to-late diastole
  • Atria and ventricles relaxed
  • Ventricles fill 80
  • Aortic and pulmonary valves closed
  • SA node discharge
  • 20 filling of ventricles
  • EDV

23
Cardiac cycle
  • Ventricular systole
  • QRS complex
  • First heart sound
  • Isometric pressure build up
  • Opening of aortic and pulmonary valves
  • ESV
  • Aortic pressure rises then falls
  • Atrial pressure rises

24
Cardiac cycle
  • Early diastole
  • T wave
  • 2nd. Heart sound (closure of aortic and
    pulmonary valves, dicrotic notch)
  • AV valves open
  • Atria fill with blood

25
Heart sounds
  • Lub
  • Caused by closure of AV valves
  • Onset of systole
  • Dub
  • Caused by closure of aortic and pulmonary
    valves
  • Onset of diastole
About PowerShow.com