What Explains the Increase in the SA Nodal Firing Rate

question 3

Multiple Choice

What explains the increase in the SA nodal firing rate caused by sympathetic stimulation?

• A) Increased permeability to K+
• B) Increased intracellular K+
• C) Increased Cl- inside the cell
• D) Increased permeability to Ca⁺⁺

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Definitions:

Altitude

The height of an object or point in relation to sea level or ground level, often affecting climate, weather, and physical exertion levels.

Hydration

The process of providing adequate water to the body to maintain health and proper functioning of all systems.

Upper Back

The region of the back that extends from the base of the neck to the bottom of the ribcage, encompassing muscles and vertebrae.

Quadriceps

A group of four muscles located at the front of the thigh, responsible for extending the knee and flexing the thigh at the hip.