Bones are covered and lined by a double layered protective tissue called periosteum. The inner (osteogenic) layer consists primarily of: O cartilage and compact bone. osteocytes and osteoclasts chondrocytes and osteocytes. osteoblasts and osteoclasts. osteoblasts and osteocytes O chondroblast and osteoblast. Question 17 (1 point) Listen Examining the activity of the bone cells of a 65-year old female with osteoporosis would reveal: Only activity of osteocytes are affected Osteoblasts have the same activity as osteoclast Osteoporosis does not affect the activity of bone cells but due to lack of calcium Osteoblasts have lesser activity then osteoclast Osteoblasts have greater activity then osteoclast Question 18 (1 point) ) Listen What kind of tissue is the precursor of the ulna (forearm) bones in the embryo