Human anatomy is far from complete, with ongoing discoveries reshaping understanding of variation, structure, and disease.

Leaf through a textbook, watch a wellness influencer, or listen in at the gym, and it can feel as though the human body has ...

The contraction process involves interactions between actin and myosin filaments within the sarcomeres to generate force. News organizations may use or redistribute this image, with proper attribution ...

Medically reviewed by Monique Rainford, MD Key Takeaways The vagina is a muscular tube connecting the outside of the body to the uterus. The vagina expands and produces more lubrication when aroused.

Cardiac muscle tissue, or myocardium, is a type of muscle tissue that forms the heart. It contracts and releases involuntarily and keeps the heart pumping blood around the body. The human body ...

Medically reviewed by Sanja Jelic, MD Key Takeaways The diaphragm is the main muscle used for breathing. The diaphragm helps with digestion and movements like bowel movements and urination.

The shoulder muscles are responsible for maintaining the widest range of motion of any joint in your body. This flexibility is also what makes the shoulder prone to instability and injury. Muscles, ...

High-force, high-repetition movements create microinjuries in muscle fibers. Muscle tissue responds by making repairs. But over time, with repetition of injury, healing capacity becomes overwhelmed, ...