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.
Briefly differentiate the terms Perception and Sensation?
Departmentation by territory It is highly suitable for the enterprise whose activities are widely dispersed. For example, in the case of assembly plants or wholesali
Specify the plant tissues which are specialized in the covering?
Define the term bispecific antibody?
Explain different types of Sales Promotion aimed at Customers?
Describe the process of Readying the Egg in short?
Explain how are nutrients distributed by digestive system in the planarias?
Specify the two reproductive novelties of beings of class Reptilia which allow for the survival within the dry environments?
Optically explain, the visual deficiencies known as hypermetropia and myopia?
Homogenization: It is intensive blending of mutually associated substances or groups of mutually associated substances to form a constant of distinct insoluble phases (sometimes with the addition of surfactants) to receive an emulsion or suspension.
18,76,764
1938208 Asked
3,689
Active Tutors
1415322
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!