What category does NOT typically cause a lowering of the pulse rate?

CNS stimulants are substances that usually increase the activity of the central nervous system, leading to heightened alertness and energy levels. A common physiological response to CNS stimulants is an increase in pulse rate, as they can cause the heart to beat faster. This is distinct from CNS depressants, narcotic analgesics, and inhalants, which are known to lower the pulse rate by producing sedation or relaxation effects on the body.

CNS depressants slow down brain activity, which can result in a decrease in heart rate. Similarly, narcotic analgesics, while primarily used for pain relief, also depress the central nervous system and can contribute to a lowered pulse rate. Inhalants can cause a variety of physiological effects but often lead to a decreased heart rate due to their depressant attributes on the body’s systems.

In this context, understanding the primary effects of these substances is crucial for recognizing their impact on physiological indicators such as pulse rate. CNS stimulants stand out as the category that typically does not cause a lowering of the pulse rate.