Skeletal muscle is a contractile tissue responsible for:

Skeletal muscle is indeed a unique type of contractile tissue primarily responsible for both voluntary and some involuntary movements in the body. The voluntary aspect refers to the ability to consciously control skeletal muscles for actions such as walking, running, and lifting objects. This is achieved through the nervous system signaling these muscles to contract.

In addition to voluntary movements, skeletal muscle can play a role in certain involuntary actions. For instance, while skeletal muscles are generally considered under voluntary control, they can also contribute to reflexive movements that occur without conscious thought, such as in response to sudden stimuli.

The other provided options do not adequately represent the full capabilities of skeletal muscle. For instance, while smooth muscle is responsible for involuntary movements within organs and the esophagus, skeletal muscle does not secrete digestive enzymes—this process is primarily managed by the glands and tissues in the digestive system. Hence, recognizing that skeletal muscle serves both voluntary movements and involuntary reflex responses justifies the selection of the answer that encompasses both aspects.