Heart contraction
How the heart contraction is triggered?
Expert
Heart contraction is not dependent upon the neuronal stimulus though it may be modulated through the autonomous nervous system. Within the heart there exist pacemaker cells which are triggered themselves the action potentials which start the contraction of muscle. These cells are generally concentrated at the two special points of heart named as: the sinoatrial node (SA node), which is located within the superior portion of right atrium and the other is atrio-ventricular node (AV node) situated near to the interatrial septum. The action potentials produced through the depolarization of SA node cells proliferate cell to cell throughout the atria generating the atrial contraction. The atrial depolarization also disseminates to AV node which then transmits electric impulse to the ventricles by the specialized conduction bundles of interventricular septum and then to Purkinje fibers of ventricle walls causing ventricular contraction. The repolarization of SA node forms the atria relax and then the ventricles relax too.
Specify how old is the universe?
What is meant by the parthenogenesis?
How are sponges exemplify according to illustration of representing beings, fundamental morphology, kind of symmetry, embryonic (or germ) layers and coelom, respiratory system, digestive system, excretory system, circulatory system, nervous system and
What do tablet fillers and binders do?
Write the gas exchange unit of mammalian lungs? Answer: The gas exchange units of mammalian lungs are the alveoli.
In which organ most of clotting factors are produced? Write down the role of vitamin K in blood coagulation?
How are production limits utilized in practice to raise the prices of the taxi rides goods or services. Municipal authorities typically regulate the number of taxis through the issuance of licenses. While the numb
What is the meaning of Globalization of Business and what is the reason many companies are in the process of expanding themselves?
Give a brief explanation of community. And also write down differentiation between the concepts of community and population.
How does the making of enzyme substrate complex occur? Elucidate the drop of the activation energy of chemical reactions?
18,76,764
1961073 Asked
3,689
Active Tutors
1439401
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!