Final answer:
Turning the head is an example of an action controlled by the somatic nervous system, as it involves voluntary movement of skeletal muscles.
Step-by-step explanation:
An example of an action controlled by the somatic nervous system is turning the head. The somatic nervous system is primarily responsible for controlling voluntary movements of skeletal muscles, such as turning one's head. While the somatic nervous system is also involved in involuntary reflexes, its defining characteristic is the control it exercises over voluntary movements in response to sensory information about the external environment. An activity like turning one's head involves a conscious decision made in the brain's cerebral cortex, whereas actions such as increasing the heart rate, releasing digestive juices, or lowering the blood pressure are controlled by the autonomic nervous system, which manages involuntary functions.