BIOL 235 Biology (Athabasca University) Midterm 1 practice question and essay 2023 all expected exam questions and answers

BIOL 235 Biology (Athabasca University) Midterm 1 practice question and essay 2023 all expected exam questions and answers In the diagram, which is the mastoid process? Osteoporosis is most common in elderly women because of the lack of , which would inhibit . 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. In endochondral ossification, what is the original source of osteoblasts? a) endoderm b) mesenchyme c) mucus connective tissue d) osteoprogenitor cells e) ectoderm 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. 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 Skeletal muscle contraction is triggered to begin when calcium is released from a) myofibrils b) mitochondria c) terminal cisterns of sarcoplasmic reticulum d) T-tubules