BIOL 235 Midterm 1 practice question and essay 2023 all expected exam questions and answers

n the diagram, which is the mastoid process? a) J b) K c) G d) H e) I Answer: a Osteoporosis is most common in elderly women because of the lack of , which would inhibit . a) hGH; osteoclast activity b) estrogen; osteoclast activity c) IGFs; chondrocyte activity d) PTH; osteoblast activity e) Calcitonin; osteoclast activity Answer: b Which of the following selections correctly lists the sequence of events that occur during intramembranous ossification? a) Ossification center develops Calcification Formation of trabeculae Development of new periosteum. b) Calcification Ossification center develops Formation of trabeculae Development of new periosteum. c) Ossification center develops Formation of trabeculae Calcification Development of new periosteum. d) Development of new periosteum Ossification center develops Calcification Formation of trabeculae. e) Ossification center develops Calcification Development of new periosteum Formation of trabeculae. Answer: a lOMoAR cPSD| In endochondral ossification, what is the original source of osteoblasts? a) endoderm b) mesenchyme c) mucus connective tissue d) osteoprogenitor cells e) ectoderm Answer: d During endochondral ossification in a fetus, bones initially develop as a cartilage model that was formed from a) periosteum. b) endosteum. c) perichondrium. d) mesenchyme. e) mucous connective tissue. Answer: d Contraction of myofibrils within a muscle fiber begins when a) sodium enters the muscle fiber b) acetylcholine binds to ligand gates c) calcium is released from the sarcoplasmic reticulum d) an action potential travels t-tubules e) calcium is moved into the sarcoplasmic reticulum Answer: c