Internal structure of mammalian heart, Biology


  • Wall of auricles are thin than wall of ventricles, because they have to push the blood to ventricles only situated close to them.
  • Walls of ventricles are thick as they have to pump the blood quite far away. Wall of left ventricle is 3 times thicker as it has to pump the blood to complete body.
  • In wall of ventricle tendinous cords present.
  • Inner wall of ventricle is raised into low muscular ridges as columnae carneae and few large muscular elavation as papillary muscles.
  • Between ventricles inter ventricular septum present, bent to right side.
  • Lumen of left ventricle is large and lumen of R.V. is small and semilunar shape.
  • Between auricles and ventricles A.V. node present, from it bundle of His orginate, gives its branches as purkinje fibres in wall of ventricles.
  • Between 2 auricles inter auricular septum present. In emrbyo in it foramen ovalis aperture present, that converts in to a fossae ovalis on birth time.
  • In R. A. 2 opening present of pre caval & post caval. (In rabbit 3 openings).
  • On opening of pre cavals eustachian valve present.
  • Behind it coronary sinus opens on it Thebasius valve present.
  • In L.A. pul. veins open by common aperture (without valve).
  • In R.A. S.A. node or pace maker or heart of heart or node of Keith & Flack present.
  • It is made up of cardiac muscles & stimulate heart beat.
  • It is connected to vagus nerve. Pace maker system consists of pulse generator & electrodes.
  • Both auricles open into ventricles by auriculo ventricular valve.
  • In right side it is made up of 3 flaps i.e. tricuspid valve, lower edges of valve are fixed to papillary muscles of ventricle wall by chordae tendinae fibres.
  • In left side it is bicuspid or Mitral valve. Both valves are one way i.e. allow blood from A to V not vice versa.
  • From R.A. pul. aorta is originated from L.A. carotico systemic arch is originated.
  • At the point of origin in both 3-3 similunar valves present, that do not allow blood to come back to ventricles.
  • In embryo at their crossing a duct ductus arteriosus present also known as duct of Botelli, which later on convert into ligament arteriosum.

2116_Internal structure of heart.png

Posted Date: 10/2/2012 1:04:07 AM | Location : United States

Related Discussions:- Internal structure of mammalian heart, Assignment Help, Ask Question on Internal structure of mammalian heart, Get Answer, Expert's Help, Internal structure of mammalian heart Discussions

Write discussion on Internal structure of mammalian heart
Your posts are moderated
Related Questions
is crossing over of chromosomes is a method?

what is the effect of insuline in body ?

If carbon 1 is the carbonyl group of a 6-carbon aldose (aldohexose), which carbon determines if the sugar is a D- or L- stereoisomer? Select one: a. 1 b. 2 c. 3 d. 4

Q. Is the upward move of warm air good or bad for the dispersion of pollutants? An upward movement of warm air is a natural method of dispersion of pollutants. The air near the

Clinical symptoms of HIV Generally, a person infected with HIV does not show any apparent symptoms for a number (3 to 12) of years. Ten to fifteen percent infected people may,

fish liver oil is rich in which vitamin ???

CELLULOSE It is a linear polymer of b -D-glucose. It is the structural polysaccharide of plant cell walls, walls of some primitive fungi, some protists, and tunic of asci

What is the response to enhance in the length of the right knee extensors in response to a quick tap applied to the right patellar tendon?  An increase in the amount of    A. o

Define the Community ecology of disease? Lyme disease is a debilitating infectious disease which has emerged in North America in the last two decades in the landscape context o

Q. What is Osseointegration in macroscopic biomechanical? A fixture is osseointegrated if there is no progressive relative motion between the fixture and surrounding living bon