Nina studies an artificial heart model. the model has tubes that supply an electric current to the model. nina switches on the current that provides an impulse to the heart. she observes that the heart contracts and relaxes. compare this model with that of a human heart, and place the steps describing how blood flows through the human heart in order. signal transferred to the ventricles the atria contract electrical signal travels toward the heart the ventricles contract signal by the nodes in the atrium signal received by the atrioventricular node puts thows in order plz

Answer
1. electrical signal travels toward the heart
2. signal by the nodes in the atrium
3. the atria contract
4. signal received by the atrioventricular node
5. signal transferred to the ventricles
6. the ventricles contract

Heart has a pacemaker that will continually send a signal. The primary site of the pacemaker is at the sinoatrial node, on the top right atrium. This node will send a signal to atria (which will cause it to contract) and to the atrioventricular node.
Atrioventricular node located between atrium and ventricle. It will send the signal to the ventricle(by the bundle of his) and cause it to contract.

Answer

1. electrical signal travels toward the heart

2. signal by the nodes in the atrium

3. the atria contract

4. signal received by the atrioventricular node

5. signal transferred to the ventricles

6. the ventricles contract

Explanation:

1. electrical signal travels toward the heart

2. signal by the nodes in the atrium

3. the atria contract

4. signal received by the atrioventricular node

5. signal transferred to the ventricles

6. the ventricles contract

Explanation:

Comparison : As Nina conceived, heart has two components:

* a mechanical component (rhythmic contractions and relaxations): the cardiac cycle, which is the succession of contraction phases (systole) ejecting the blood out of the left ventricle and relaxation phases (diastole) allowing the filling of the cardiac cavity,

* an electrical component (under fores of electric discharges), directly responsible for the mechanical phase with which it is perfectly synchronized.

The right order is

*Electrical signal travels toward the heart.

*Signal received by the nodes in the atrium

*The atria contract

*Signal received by the atrioventricular node

*Signal transferred to the ventricles

*The ventricles contract

Explanation

* The electric current is born at a specific point of the heart (on the order of a few millimeters in diameter), called sinus node, located at the top of the right atrium.

This consists of cells capable of producing an electric current. Starting from the sinus node, the current propagates in the cardiac muscle (including the two atria) causing their contraction. Then, it converges to the septum of the heart, at the level of an electrical relay called atrioventricular node (NAV).

From the atrioventricular node (NAV), the impulse progresses simultaneously in the 2 ventricles, the right and the left, taking very fast conductive pathways (the Hys beam and the Purkinje network), causing contraction of the ventricles.

The correct order is:

Electrical signal travels toward the heart .Signal received by the nodes in the atrium .The atria contract .Signal received by the atrioventricular node.Signal transferred to the ventricles .The ventricles contract .

Explanation:

The steps are:

Signal transferred to the ventricles .The atria contract .Electrical signal travels toward the heart .The ventricles contract .Signal received by the nodes in the atrium .Signal received by the atrioventricular node.

The question refers to the heart's physiological electrical conduction mechanism, which goes from the atrial node to the atrioventricular node, passes to the bundle of His and its branches, and then extends through the Purkinje fiber system, all so that coordinated events occur that allow blood flow within this organ.

The correct order of steps, linked to the activity of the heart and blood flow are:

Electrical signal travels towards the heart: the autonomic nervous system conducts the nerve impulse to the heart. Signal received by the nodes in the atrium: the atrial node, a structure that is located on the right atrium, receives the nerve impulse and is responsible for transmitting it to the ventricular atrial node. The atria contract: the contraction of this structure drives the blood to the ventricles, promoting the simultaneous opening of the atrioventricular valves. Signal received by the atrioventricular node: a node located in the interventricular septum is responsible for the distribution of the impulse to the His-Purkinje system. Signal transferred to the ventricles: the nerve signal passes to the His bundle, its branches and then the Purkinje fibers found in both ventricles. The ventricles contract: ventricular contraction promotes the emptying of your cavities, passing blood from the right ventricle to the lungs, and from the left ventricle to the general circulation. At this time the atrioventricular valves are closed and the sigmoid valves are opened, to allow anterograde blood flow.

Learn more:

Movement of oxygenated blood leaving the heart

The human heart has it own nervous system, nodal system. It's made of nodes (that produces nerve impulses) and nerve fibers (running to all parts of the heart). Our nervous system can only increase or decreasing the nodes firing rates.

Starting with deoxygenated blood (oxygen poor blood), it travels from the superior and inferior vena cava into the right atrium, then into the right ventricle via the tricuspid value. There, it enters the pulmonary arteries via the pulmonic value. From there, it heads to the lungs and become oxygenated (rich in oxygen). It re-enters the left atrium of the heart via the pulmonary veins. There, it now travels to the left ventricle via the mitral valve and then into the aorta via the aortic value. From there it travels to the rest of the body supplying cells with oxygen and return back via the vena cava.

The steps that correctly depicts how blood flows through the human heart is in the following order:

1. Electrical signal travels toward the heart.

2. Signal received by the nodes in the atrium

3. The atria contract

4. Signal received by the atrioventricular node

5. Signal transferred to the ventricles

6. The ventricles contract