Which of the Following Is True of the Structures of the Electrical

question 26

Multiple Choice

Which of the following is true of the structures of the electrical conduction system?

• A)The AV valve is the pacemaker.
• B)In normal sinus rhythm,the electrical signal arises within the SA node.
• C)The His-Purkinje system spreads the electrical system from the right atrium to the left atrium.
• D)The purpose of the AV node is to increase the speed at which the cardiac impulse moves from the atria to the ventricles.

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Definitions:

Nitrification

A microbial process in the nitrogen cycle where ammonia is converted into nitrite and then into nitrate.

Atmosphere

The layer of gases surrounding a planet, essential for life on Earth, providing air to breathe and protecting from harmful solar radiation.

Assimilation

The process by which individuals or groups of differing ethnic heritage are absorbed into the dominant culture of a society.

Chlorophyll

A pigment found in plants and algae that absorbs sunlight for photosynthesis, giving them their green color.