Muscle Physiology Glossary

noun a type of muscle that is under conscious control

adjective describing the type of muscle as voluntary

• Voluntary muscles are muscles that are under conscious control.
• You can flex your voluntary muscles whenever you want.
• I've been hitting the gym to work on my voluntary muscles.
• Exercising your voluntary muscles of self-control is important for personal growth.

noun a protein that forms microfilaments in muscle cells and is involved in muscle contraction

• Actin is a protein that plays a key role in the contraction of muscle cells.
• The actin filaments in the cell help with movement and support.
• I heard that actin is like the 'muscle builder' of the cell.
• Just like actin filaments provide structure and support to cells, we need to act in a supportive way towards each other.