The Semilunar Valves Open When the

question 22

Multiple Choice

The semilunar valves open when the

• A)Atrial pressure exceeds the ventricular pressure.
• B)Atrial and ventricular pressures are equal.
• C)Ventricular pressure exceeds the aortic and pulmonary arterial pressures.
• D)Impulse arrives at the AV node.

---

Definitions:

Absolute Sensory Threshold

The minimum stimulus intensity required for detection by a sensory system.

Stimulus

Anything that triggers a sensory or behavioral reaction in a living organism.

Unconscious Level

Refers to the part of the mind that is inaccessible to the conscious mind but that affects behavior and emotions.

Pheromone

A chemical substance produced and released into the environment by an animal, especially an insect, affecting the behavior or physiology of others of its species.