Skeletal muscles are voluntary muscles that can be consciously controlled, such as the muscles of your limbs, head, neck, and body. They are attached to bones and respond to neuromuscular signals from ...

The ductus arteriosus (DA), a fetal arterial shunt vessel between the proximal descending aorta and the pulmonary artery, closes shortly after birth. Initial functional closure as a result of the ...

Lip twitching can be caused by successive caffeine intake or other causes that resolve on their own, as a side effect of certain medications, or from serious underlying causes like ALS. See a ...

Edited by Kurt Beam, University of Colorado Anschutz Medical Center, Aurora, CO; received September 3, 2024; accepted February 20, 2025 ...