Muscle Vocab

• Animals can have different body types with different musculature (cattle).
• A trait is a characteristic (like muscle size) that can vary in animals.
• Muscle size can vary because of muscle cell size, number, and mass.
• Muscles can contract and relax when functioning properly, and they give the body form and movement ability.
• Proteins (thin Actin and thick Myosin) are in the muscle fibers and cause the contractions of muscle cells.
• Extra big muscles can result from parents having bigger muscle size, nutrition (protein), and exercise routines