Answer: The fill in the blank can be filled with- New muscle tissue, digestive enzymes, hormones, and bone.
Muscle is a soft body tissue which is essential for the various physiological functioning of the body. It is primarily made up of actin and myosin proteins which make up thin and thick filament of muscle fibers. Example- Skeletal muscle.
Digestive enzymes, as the name suggests, help in the digestion of food. They are primarily the globular proteins which perform biological reactions.
Example- Pepsin.
Hormones are mainly signaling molecules which relay information over the short and long distance in the body. some hormones are protein derivatives, which means that they are made up of proteins.
Example- Insulin.
An adequate amount of protein is also required for maintaining good bone health.
Example- Collagen protein. This is found abundantly in the bone matrix.