Column 1
the layer of skin below the epidermis
Dermis
a TOUGH CONNECTIVE TISSUE that ATTACHES a MUSCLE TO a BONE or to another body part
Tendon
a fiber that is found in striated muscle cells and that is responsible for muscle contraction
Myofibril
the layer of cells that lies under the skin
Subcutaneous Tissue
soft tissue inside bones where red and white blood cells are made
Bone Marrow
a condition in which bones become thin and weak and break easily
Osteoporosis
a muscle that bends a limb or other body part
Flexor
the most common protein in muscle tissue and the main part of the thick filaments of muscle fibers
Myosin
any cavity that holds and protects
organs, such as the thoracic, abdominal,
or pelvic cavity
Body Cavity
a pit in the skin that encloses a hair and its root
Hair Follicle
the bones of
the skull and
vertebral column
Axial Skeleton
a muscle that extends a joint
Extensor
the basic unit of contraction in skeletal and cardiac muscle
Sarcomere
the bones of the arms and legs
Appendicular Skeleton
a pigment that gives skin its color and protects the skin from ultraviolet radiation
Melanin
a bone cell
Osteocyte
the outer surface layer of cells of a plant or animal
Epidermis
a hard, flexible protein that forms hair, feathers, nails, and horns
Keratin
the TOUGH, fibrous TISSUE that COVERS BONES and CONTAINS BLOOD VESSELS that SUPPLY NUTRIENTS to the bones and nerves
Periosteum
a TISSUE made of cells that form a BARRIER BETWEEN a LIVING THING and the tissue’s OUTSIDE ENVIRONMENT
Epithelial Tissue
a TYPE of TISSUE that HOLDS the
ends of the BONES TOGETHER in
a joint
Ligament
a protein that plays a part in the contraction and relaxation of muscle
Actin
the tissue of the nervous system, which is made of neurons and their supporting cells
Nervous Tissue
a tissue that can contract and relax to produce movement
Muscle Tissue
a place where two or more bones meet in the body
Joint