Explain how heart contraction triggered
Explain how heart contraction triggered?
Expert
Heart contraction is independent from neuronal stimulus (although it can be modulated by autonomous nervous system). In heart, there are pacemaker cells which trigger by themselves the action potentials which start the muscle contraction. Such cells are concentrated at two special points of the heart: the sinoatrial node (that is, SA node) positioned in the superior part of the right atrium and the atrioventricular node (that is, AV node) positioned near the interatrial septum.
The action potentials produced by depolarization of the SA node cells propagate cell to cell all through the atria generating the atrial contraction. The atrial depolarization as well propagates to the AV node which then transmits the electric impulse to the ventricles via specialized conduction bundles of the interventricular septum (that is, the bundle of His) and then to the Purkinje fibers of the ventricle walls causing the ventricular contraction. (Atrial contraction leads the ventricular contraction for blood to fill the ventricles prior to the ventricular contraction.)The re-polarization of the SA node forms the atria relax and then the ventricles relax as well.
List in order the steps involved in the break down of glucose
Coordination through the management process Coordination helps maximize the achievement of a group by means of achievement of a group by means of obtaining a balance
What is the role of the flagellum of a sperm cell? Also how is this formed?
State how the immune memory leads to efficacy of vaccines and also produces allergies?
Can an ovarian cyst be normal?
Give an explanation for bleeding which accompanies menses?
Another pragmatic reason for diversity in today's organizations stems from legislation and lawsuits. The political and legal systems have compelled organizations to hire more broadly and to provide equal opportunity for all employees. Although legislation going as far back as the civil rights act
Strategic Alliance: It is an arrangement between two companies which have decided to share resources to undertake a particular, mutually valuable project. Strategic alliance is less concerned and less permanent than a joint venture, in which two compa
name the scientists and their discoveries / inventions in the field of genetics
Give a brief description of allosteric enzymes?
18,76,764
1933584 Asked
3,689
Active Tutors
1441300
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!